defecte directie2

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Chassis

"The repair procedures given by the manufacturer in this document are based on the

technical specifications current when it was prepared.

The procedures may be modified as a result of changes introduced by themanufacturer in the production of the various component units and accessories fromwhich his vehicles are constructed."

V4

All rights reserved by Renault s.a.s.

Edition Anglaise

Copying or translating, in part or in full, of this document or use of the service partreference numbering system is forbidden without the prior written authority ofRenault s.a.s.

Renault s.a.s.

V4MR-372-J84-36B000$000_engTOC.mif

POWER ASSISTED STEERING

EPASVdiag No.: 05, 09Fault finding - Introduction 36B - 2Fault finding - System operation 36B - 7Fault finding - Allocation of computer tracks 36B - 9Fault finding - Replacement of components 36B - 10Fault finding - Configurations and programming 36B - 11Fault finding - Fault summary table 36B - 13Fault finding - Interpretation of faults 36B - 14

Fault finding - Conformity check 36B - 28Fault finding - Status summary table 36B - 36Fault finding - Interpretation of statuses 36B - 37Fault finding - Parameter summary table 36B - 40Fault finding - Parameter interpretation 36B - 41Fault finding - Customer complaints 36B - 47Fault finding - Fault finding chart 36B - 48

36B

MR-372-J84-36B000$000_engTOC.mif


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Fault finding - Introduction 36B

36B - 2V4MR-372-J84-36B000$066_eng.mif

136BEPAS

Vdiag No.: 05, 09


Fault finding - Introduction

1. SCOPE OF THIS DOCUMENT

This document presents the fault finding procedure applicable to all computers with the following specifications:

2. PREREQUISITES FOR FAULT FINDING

Documentation type

Fault finding procedures (this manual): Assisted fault finding (integrated into the diagnostic tool), Dialogys.

Wiring Diagrams: Visu-Diagram (CD-ROM), paper.

Type of diagnostic tools

CLIP

Special tooling required

3. REMINDER

Procedure

To run fault finding on the vehicle's computers, switch on the ignition in fault finding mode (forced + after ignitionfeed).

Proceed as follows: vehicle card in reader, press and hold start button (longer than 5 seconds) with start-up conditions not fulfilled, connect the diagnostic tool and perform the required operations.

To cut off + after ignition feed, proceed as follows: disconnect the diagnostic tool, press the Start button twice briefly (less than 3 seconds), Check that the + after ignition feed has been cut off by checking that the computer warning lights on the

instrument panel have gone out.

Vehicle(s): Scnic II

Function concerned: EPAS

Computer name: Electric power assisted steering

Vdiag No.: 05, 09

Special tooling required

Multimeter

El. 1681 Universal bornier

EPAS_V05_ PRELI/EPAS_V09_ PRELI

MR-372-J84-36B000$066_eng.mif


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36B - 3V4MR-372-J84-36B000$066_eng.mif

EPAS

Vdiag No.: 05, 09

Faults

Faults are declared as either present or stored (depending on whether they appeared in a certain context and havedisappeared since, or whether they remain present but have not been diagnosed within the current context).

The present orstored status of faults should be taken into consideration when the diagnostic tool is switched onafter the + after ignition feed (without any system components being active).

For a present fault, apply the procedure described in the Interpretation of faults section.

For a stored fault, note the faults displayed and apply the instructions in the Notes section.

If the fault is confirmed when the instructions in the Notes section are applied, the fault is present. Deal with the fault

If the fault is not confirmed, check: the electrical lines which correspond to the fault, the connectors for these lines (for oxidation, bent pins, etc.), the resistance of the component detected as faulty, the condition of the wires (melted or split insulation, wear).

Conformity check

The aim of the conformity check is to check data that does not produce a fault on the diagnostic tool because thedata is inconsistent. Therefore, this stage is used to:

carry out fault finding on faults that do not have a fault display, and which may correspond to a customercomplaint.

check that the system is operating correctly and that there is no risk of a fault recurring after repairs.

This section gives the fault finding procedures for statuses and parameters and the conditions for checking them.

If a status is not behaving normally or a parameter is outside the permitted tolerance values, consult thecorresponding fault finding page.

Customer complaints - Fault finding chart

If the test with the diagnostic tool is OK but the customer complaint is still present, the fault should be processed bycustomer complaint.

A synopsis of the general procedure to follow is providedon the following page in the form of a flow chart.


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Fault finding - Introduction

36B - 4

36B

V4MR-372-J84-36B000$066_eng.mif

EPAS

Vdiag No.: 05, 09

4. FAULT FINDING PROCEDURE

Perform a pre-diagnosticon the system

Print the system fault finding log(available on CLIP and in theWorkshop Repair Manual or

Technical Note)

Connect CLIP

noDialogue with

computer?

yes

Read faults

noFaults

present

yes

Deal with present faults

Deal with stored faults

noThe cause is still

presentFault

cured

yes

Refer to ALP No. 1

Conformity check

noThe cause isstill present

Fault

cured

Use fault finding charts (ALPs)

noThe cause isstill present

Fault

cured

Contact the Techline with thecompleted fault finding log


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36B - 5V4MR-372-J84-36B000$066_eng.mif

EPAS

Vdiag No.: 05, 09

FAULT FINDING PROCEDURE (continued)

Wiring check

Fault finding problemsDisconnecting the connectors and/or manipulating the wiring harness may temporarily remove the cause of a fault.Electrical measurements of voltage, resistance and insulation are generally correct, especially if the fault is notpresent when the analysis is made (stored fault).

Visual inspectionLook for damage under the bonnet and in the passenger compartment.Carefully check the fuses, insulators and wiring harness routing.Look for signs of oxidation.

Tactile inspectionWhile manipulating the wiring harness, use the diagnostic tool to note any change in fault status from stored topresent.Make sure that the connectors are properly locked.Apply light pressure to the connectors.Twist the wiring harness.If there is a change in status, try to locate the source of the fault.

Inspection of each componentDisconnect the connectors and check the appearance of the clips and tabs, as well as the crimping (no crimping onthe insulating section).Make sure that the clips and tabs are properly locked in the sockets.Check that no clips or tabs have been dislodged during connection.Check the clip contact pressure using an appropriate model of tab.

Resistance checkCheck the continuity of entire lines, then section by section.Look for a short circuit to earth, to + 12 V or to another wire.If a fault is detected, repair or replace the wiring harness.


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36B - 6V4MR-372-J84-36B000$066_eng.mif

EPAS

Vdiag No.: 05, 09

5. FAULT FINDING LOG

You will always be asked for this log: when requesting technical assistance from Techline, for approval requests when replacing parts for which approval is mandatory,

to be attached to monitored parts for which reimbursement is requested. The log is needed for warrantyreimbursement, and enables better analysis of the parts removed.

6. SAFETY ADVICE

Safety rules must be observed during any work on a component to prevent any damage or injury: make sure that the battery is properly charged to avoid damaging the computers with a low load, Use the proper tools.

IMPORTANT

IMPORTANTAny fault on a complex system requires thorough fault finding with the appropriate tools. TheFAULT FINDING LOG, which should be completed during the procedure, enables you to keep

track of the procedure which is carried out. It is an essential document when consulting themanufacturer.

IT IS THEREFORE MANDATORY TO FILL OUT A FAULT FINDING LOG EACH TIME FAULT FINDINGIS CARRIED OUT.


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Fault finding - System operation 36B

36B - 7V4MR-372-J84-36B000$132_eng.mif

EPAS

Vdiag No.: 05, 09


Fault finding - System operation

GENERAL OPERATION

On this vehicle, the steering system is power-assisted by an electric motor attached to the steering column.

The driver's action is relayed by a torque sensor, which measures the force applied to the steering, and a steeringcolumn angle sensor. Assistance is given by an electric motor which applies more or less torque to the steeringcolumn, in one direction or the other.

A computer controls this assistance according to several vehicle environment parameters, including the vehiclespeed.

EPAS ALSO OFFERS THE FOLLOWING:

Active recall:This function is made necessary by the design of the front axle of vehicles with electric power assisted steering. It isused to bring the steering wheel back to the straight-ahead position when the vehicle is moving slowly (but notstationary). This function is normal on hydraulic power steering vehicles or vehicles without assistance.This function cannot be deactivated by the diagnostic tool.

This feature is inactive when the steering wheel angle is not available (ET020 Programming steering wheel anglesensor for STATUS 1, STATUS 2 and STATUS 3).

Lock torque limit:This function limits the assistance torque when the steering wheel is held at full lock with considerable effort, whenthe vehicle is stationary or travelling at a speed less than 3 mph (5 km/h). The purpose of this function is to limitoverheating of the electric power assisted steering motor.

Note:

When the computer detects a fault, the level of assistance can be modified depending on how serious the fault is.An incorrect or absent vehicle speed signal results in assistance equal to that provided at 60 mph (100 km/h)without active return. The EPAS sends a Steering wheel anglesignal to the ESP computer.

MR-372-J84-36B000$132_eng.mif


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Fault finding - System operation 36B

36B - 8V4MR-372-J84-36B000$132_eng.mif

EPAS

Vdiag No.: 05, 09

SIGNALS RECEIVED AND SENT

Vehicle speed

Electric powerassisted steering

computer

Steering wheel angle

Engine status Column rotation speed

Power supply (permanent +) Instrument panel indicator light on

Supply (+ after ignition feed) Diagnostic socket

Earth


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POWER ASSISTED STEERING36B

36B - 9V4MR-372-J84-36B000$198_eng.mif

EPAS

Vdiag No.: 05, 09


Fault finding - Allocation of computer tracks

Electric power assisted steering computer8-TRACK CONNECTOR

2-TRACK BLACK CONNECTOR

Track Description

1 Not used

2 Not used

3 Not used

4 CAN L signal to Instrument panel

5 CAN L to UCH

6 CAN H signal to Instrument panel

7 CAN H to UCH

8 + 12 V after ignition feed

Track Description

1 + 12 V before ignition feed

2 Earth

IMPORTANTThe three white connectors which connect the EPAS computer to the different EPAS sensors must never bedisconnected.You must not press the connectors more than once when checking that they have been correctly locked into place.Equally, the three electric motor feed wires must never be unscrewed.

MR-372-J84-36B000$198_eng.mif


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Fault finding - Replacement of components 36B

36B - 10V4MR-372-J84-36B000$264_eng.mif

EPAS

Vdiag No.: 05, 09


Fault finding - Replacement of components

Precautions for use

The computer, electric motor, upper steering column and angle sensor unit (EPAS) cannot be separated.

A. Replacing the EPAS (computer - upper column assembly):

Before replacing the EPAS, run fault finding on the system: apply the appropriate fault finding procedure.The EPAS may be replaced only with the consent of the Techline.When replacing the electric power assisted steering, carry out the following operations in order: disconnect the vehicle battery, replace the EPAS (see Workshop Repair Manual 370 Mechanics, 36B, Electric power assisted steering), reconnect the vehicle battery, connect the diagnostic tool, switch on the ignition and establish dialogue with the EPAS computer, then write the

vehicle VIN by running command VP001, configure (see Configuration and programming), program the steering wheel angle sensor (see Configuration and programming), write the most recent After-Sales operation date by running command VP005, switch off the ignition for at least 15 seconds for the configurations to register, without disconnecting the battery, switch on the ignition and establish dialogue with the electric power assisted steering computer, turn the steering wheel to full right lock and then to full left lock, check that there are no faults and that the variables are correct (notably parameterPR121 Steering wheel angle), check that the EPAS is working correctly (steering assistance available when the engine is running).

B. Replacing the steering rack (without changing the EPAS): disconnect the vehicle battery, replace the steering rack (see MR370 Mechanics, 36B, EPAS), reconnect the vehicle battery, connect the diagnostic tool, switch on the ignition and establish dialogue with the electric power assisted steering

computer, program the steering wheel angle sensor (see Configuration and programming), turn the steering wheel to full right lock and then to full left lock, make sure that there are no faults and check the conformity of parameterPR121 Steering wheel angle, check that the EPAS is working correctly (steering assistance available when the engine is running).

WARNINGYou must never leave the ignition switched on or the engine running during a mechanical operation on the electricpower assisted steering or the front axle. To prevent accident, the battery must be disconnected (to prevent thedanger of accidental triggering of the EPAS motor).

MR-372-J84-36B000$264_eng.mif


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Fault finding - Configurations and programming 36B

36B - 11V4MR-372-J84-36B000$330_eng.mif

EPAS

Vdiag No.: 05, 09


Fault finding - Configurations and programming

Summary table of configurations and configuration readings

GENERAL INSTRUCTIONS:

After replacing the EPAS computer/steering column unit, configure the computer's assistance strategy and programthe steering wheel angle sensor.The following procedure must be followed in order to carry out the above configuration and programming: connect the diagnostic tool, switch on the ignition and establish dialogue with the electric power assisted steering computer, select the "Repair mode" menu, configure the computer's assistance strategy and program the steering wheel angle sensor (see below), exit fault finding mode: stop dialogue with the electric power assisted steering computer without switching off the

CLIP tool, switch off the ignition for at least 15 seconds, without disconnecting the battery, for the configuration to be

registered by the EPAS computer, switch on the ignition again and establish dialogue with the electric power assisted steering computer, make sure the configuration readings have been properly registered, check that the system is operating correctly (steering assistance available when the engine is running).

A. PROGRAMMING THE STEERING WHEEL ANGLE SENSOR

PROCEDURE COMPLETE:(following replacement of the computer/steering column assembly).

Status ET020 Steering wheel angle sensor programming is STATUS 1 (SERVICE indicator light is continuouslylit, see interpretation of status). with the ignition on, connect the diagnostic tool and establish dialogue with the electric power assisted steering

computer, with the engine stopped or running (to obtain maximum steering assistance), turn the steering wheel to full left lock

and then to full right lock, set the vehicle wheels straight ahead, with the steering at the centre point (driving in a straight line), run command VP004 Steering wheel angle sensor programming by pressing the CONFIRM button,

turn the steering wheel to full left lock and then to full right lock, Status ET020 Steering wheel angle sensor programming must be STATUS 4 (normal operational status). check that parameterPR121 Steering wheel angle varies within the limits indicated in the Conformity check

section and that DF038 Angle sensoris not present.

VP001 Enter VIN ID010 VIN code

VP004 Steering wheel angle sensor programming ET020 Steering wheel angle sensor programming

VP005 Write After-Sales service date ID018 Read last After-Sales service date

SC001 Computer calibration ET026 Computer calibration

Note:To obtain a precise wheels straight ahead position (straight line driving), carry out this operation on a front axleadjustment bench (especially for vehicles fitted with ESP).

IMPORTANTIf the vehicle is fitted with ESP, establish dialogue with the ABS/ESP computer after the operation; if the function

is available (depending on the computer version) clear the ESP sensor programming using command RZ003.Make sure there are no ESP faults: carry out the necessary operations by referring to the Fault Finding Manual.

MR-372-J84-36B000$330_eng.mif


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Fault finding - Configurations and programming 36B

36B - 12V4MR-372-J84-36B000$330_eng.mif

EPAS

Vdiag No.: 05, 09

STARTING WITH WHEELS TURNED (OUTSIDE RANGE 120)

When starting the engine with the wheels fully locked (outside range 120), status ET020 Steering wheel anglesensor programming is STATUS 3. No fault is indicated by the EPAS or ESP and no indicator light comes on, as

this is a basic operation of the system.

In order for status ET020 to be STATUS 4 turn the wheels so that they are straight (normal operating range).

B. CONFIGURING THE STEERING ASSISTANCE STRATEGY

This configuration enables the computer's assistance strategy to be calibrated depending on the vehicle type, enginetype, gearbox type and tyre sizes. with the ignition on, connect the diagnostic tool and establish dialogue with the electric power assisted steering

computer, run command SC001 Computer calibration by pressing the CONFIRM button, enter the criteria corresponding to the vehicle, check, using status ET026 Computer calibration, that the criteria that have been entered correspond to the

vehicle.


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Fault finding - Fault summary table 36B

36B - 13V4MR-372-J84-36B000$396_eng.mif

EPAS

Vdiag No.: 05, 09


Fault finding - Fault summary table

Tool fault Diagnostic tool titleAssociated

DTCCustomer complaints and warning light

coming on

DF001 Motor thermal protection 5614 Steering assistance intermittent reduction

DF002 Computer 5608 Assistance limited to 30 % (with SERVICEindicator light + message) or no assistance(with STOP indicator light + message)depending on the internal fault code

DF020 Computer supply 5601 Degraded assistance (no indicator light ormessage) until a loss of assistance below9 V or above 17 V with STOP indicatorlight + Message

DF021 Steering wheel angle sensorprogramming

5612 Degraded steering wheel recall (withSERVICE indicator light + message). ESP

fault, if presentDF023 + after ignition feed 5613 Assistance gradually cuts out (within

5 minutes); when the ignition is nextswitched on there is absence of steeringassistance

DF033 Multiplex network D000 Inappropriate level of assistance:SERVICE indicator light + Message

DF035 Variable power assisted steering motor 5606 Assistance limited to 30 % (with SERVICEindicator light + message) or no steeringassistance (with STOP warning light +Message)

DF038 Angle sensor 5605 Steering wheel recall degraded (nowarning light or message). ESP fault, ifpresent

DF053 Computer configuration 5602 Defect mode assistance (no message orwarning light),

DF054 Torque sensor 5604 Steering assistance loss or absence withSTOP indicator light + Message.

DF055 Computer memory 5607 Degraded assistance (without indicatorlight or message) or assistance limited to

10 % with SERVICE warning light +MessageRisk of ESP fault

DF057 Vehicle speed multiplex signal D200 Inappropriate level of assistance:SERVICE indicator light + Message

Note:Warning light/messageSERVICE + "Check steering" or,STOP + audible warning + "Faulty steering" or "EPAS fault", depending on the type of instrument panel.

MR-372-J84-36B000$396_eng.mif


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Fault finding - Interpretation of faults 36B

36B - 14V4MR-372-J84-36B000$462_eng.mif

EPAS

Vdiag No.: 05, 09


Fault finding - Interpretation of faults

DF001PRESENT

OR

STORED

MOTOR THERMAL PROTECTION

NOTES

Priority in the event of a number of faults:Deal with fault DF020 Computer supply voltage first, whether it is present or stored.

Conditions for applying the fault finding procedure to stored faults:Apply this fault finding procedure even if the fault is stored.

Notes:This fault does not indicate a system failure, but indicates either overheating of theElectric Power-Assisted Steering motor (160 C) or of the computer (100 C) duringrepeated manoeuvres.This fault can occur following repeated actions on the steering wheel (parking) andcauses a reduction in the steering assistance.

Check the conformity of the battery voltage and carry out fault finding on the charge circuit if necessary.

Remove the underside of the dashboard in order to gain access to the EPAS.Ensure (carefully) that the EPAS is not still hot.If the EPAS is still hot, let it cool for an hour before working on it.

Make sure that nothing in the EPAS environment can cause overheating (presence of components under thedashboard, etc.).Repair if necessary.

After leaving the EPAS to cool (PR008 Computer temperature and PR009 Steering motor temperature below30 C), clear the fault, start the engine and check that the EPAS is operating correctly by repeatedly carrying outparking manoeuvres (turn the wheel slowly from lock to lock).Check that PR014 Level of assistance available = 100 %.

If the fault is present once more or is stored after just a few manoeuvres, contact Techline.

AFTER REPAIRClear the stored faults.Check that the EPAS is working.Deal with any other faults.

DAE_V05_DF001/DAE_V09_DF001

MR-372-J84-36B000$462_eng.mif


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36B - 15V4MR-372-J84-36B000$462_eng.mif

EPAS

Vdiag No.: 05, 09

DF002PRESENT

OR

STORED

COMPUTERDEF : Computer fault

NOTES

Priority in the event of a number of faults:In the event of an accumulation of faults, deal with the other present and stored faultsbefore applying the interpretation for this fault.

Conditions for applying the fault finding procedure to stored faults:

The fault is declared present after having started the engine and turned the steeringwheel from lock to lock.

Notes: This fault causes an absence of steering assistance or a loss of steering assistance

and also illuminates the STOP indicator light +Message or assistance is limited to30 % and the SERVICEindicator light + Message come on.

Disconnect the 2 black connectors from the EPAS computer.Check the condition and conformity of the connectors and their clips.Check the conformity of the electrical supplies (they must be equal to the battery voltage).In the event of a fault, check the insulation, continuity and the absence of interference resistance on thefollowing connections:

8-track connector, track 8 + 12 V After ignition feed

2-track connector, track 1 + 12 V before ignition feed

2-track connector, track 2 Earth

Repair if necessary.

If the fault is still present, contact the Techline.




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36B - 16V4MR-372-J84-36B000$462_eng.mif

EPAS

Vdiag No.: 05, 09

DF020PRESENT

OR

STORED

COMPUTER SUPPLY VOLTAGE1.DEF: Voltage too low1.DEF: Voltage too high

CO : Open circuit

NOTES

Conditions for applying the fault finding procedure to stored faults:The fault appears when the engine is running.

Notes:This fault causes a degraded assistance (no warning light or message) until assistance

is lost (below 9 V or above 17 V) with STOP warning light + Message. The computer records an occurrence context (computer operating values frozen

when fault occurs). To view this information, click on the fault description (camerasymbol). Within these values, parameterPR143 Internal fault code gives the faultfinding procedure to apply.

Procedure to apply for internal fault code 135 of the PR143

Check the conditioning and positioning of the EPAS supply fuses: Power fuse (80A BP81) in the engine fuse box. AP44 after ignition fuse (5A) in the Protection and Switching Unit.

Check the condition and tightness of the battery and alternator terminals, as well as the Protection and Switching

Unit bolt.Carry out fault finding on the charge circuit.Repair if necessary.

Disconnect the two black connectors from the EPAS computer.Check the condition and conformity of the connectors and their clips.Check the conformity of the electrical supplies (they must be equal to the battery voltage).In the event of a fault, check the insulation, continuity and the absence of interference resistance on thefollowing connections:

8-track connectortrack 8 + 12 V After ignition feed

2-track connectortrack 1 + 12 V before ignition feed

2-track connectortrack 2 Earth






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EPAS

Vdiag No.: 05, 09

DF020

CONTINUED

Procedure to be applied for internal fault codes 147 and 148 of PR143

The EPAS is not the reason for these internal fault codes. Check the condition of the battery and carry out faultfinding on the charge circuit.



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36B - 18V4MR-372-J84-36B000$462_eng.mif

EPAS

Vdiag No.: 05, 09

DF021PRESENT

PROGRAMMING THE STEERING WHEEL ANGLE SENSORDEF : Programming not carried out or incorrect

NOTES

Notes:This fault is present for as long as the steering wheel angle is not calibrated. It isautomatically cleared as soon as the programming procedure is completed.This fault causes an absence of steering wheel recall (with warning light continuouslyon).

Place the vehicle on a front axle adjusting bench.Position the vehicle wheels in the straight line driving position (steering centre point).Program the steering wheel angle via command VP004 Steering wheel angle sensor programming (seeConfiguration and programming, section A).

Vehicle in straight line driving position (steering centre point).Refer to parameters PR121 Steering wheel angle and PR007 Steering wheel angle offset compensation.Both parameters must be 0.Turn the steering wheel to full right lock then to full left lock, and check that the parameter varies within thetolerances given in the conformity check.

Refer to status ET020 Steering wheel angle sensor programming, which must be STATUS 4.

Start the engine and check the operation of the EPAS by turning the steering wheel from lock to lock (parkingmanoeuvres).



DAE_V05_DF021P/DAE_V09_DF021P


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36B - 19V4MR-372-J84-36B000$462_eng.mif

EPAS

Vdiag No.: 05, 09

DF023PRESENT

OR

STORED

+ AFTER IGNITION FEED1.DEF : Abnormal voltage

NOTES

Notes:When this fault appears, the assistance gradually cut outs within 5 minutes.Next time the ignition is switched on, this fault causes the absence of steeringassistance.

Check the power supply fuse for the EPAS:

AP44 after ignition fuse (5A) in the Protection and Switching Unit.

Check the tightness and the condition of the battery terminals.Repair if necessary.

Disconnect the 8-track connector of the EPAS computer.Check the condition and conformity of the connector and its clips.Check the conformity of the 12 V after ignition feed, with the ignition on and engine running (it must be equal tothe battery voltage).In the event of a fault, check the insulation, continuity and the absence of interference resistance on thefollowing connection:

8-track connectortrack 8 + 12 V After ignition feed


If the connections are OK but the EPAS computer electrical supply is not correct, run fault finding on the chargecircuit.




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EPAS

Vdiag No.: 05, 09

DF033PRESENT

OR

STORED

MULTIPLEX NETWORKDEF : CAN connection fault

NOTES

Conditions for applying the fault finding procedure to stored faults:Apply this fault finding procedure.

Priority in the event of a number of faults:Apply the interpretation of faults DF020 Computer supply and DF023 + after ignition

supply first, if they are present or stored.

Notes:This fault may cause a reduction in steering assistance with the SERVICE warning light+ Message.

Run fault finding on the multiplex network.Carry out the necessary repairs.

Disconnect the 8-track connectorfrom the EPAS computer.Check the condition and conformity of the connector and its clips (terminals).Repair if necessary.

Check the insulation, continuity and the absence of interference resistance on the following connections:

8-track connector of the EPAS computer

track 5 UCH

track 7 UCH

track 4 Instrument panel

track 6 Instrument panel

(see wiring diagram)Repair if necessary.





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36B - 21V4MR-372-J84-36B000$462_eng.mif

EPAS

Vdiag No.: 05, 09

DF035PRESENT

OR

STORED

VARIABLE POWER ASSISTED STEERING MOTORDEF : Internal electronic fault

NOTES

Conditions for applying the fault finding procedure to stored faults:The fault is declared present after having started the engine and turned the steeringwheel from lock to lock.

Notes:

This fault causes a loss of assistance or an absence of steering assistance and alsoilluminates the STOP warning light + Message, or assistance is limited to 30 % andthe

SERVICE indicator light + Messagecome on.

The computer records an occurrence context (computer operating values frozenwhen fault occurs). To view this information, click on the fault description (camerasymbol). Within these values, parameterPR143 Internal fault code gives the faultfinding procedure to apply.

Procedure to apply for internal fault codes 3, 33, 34, 35, 50, 51, 112, 113, 128, 145 of PR143.

Contact the Techline.

Procedure to apply for internal fault codes 4, 5, 100, 114, 115, 129, 130 and 131 of PR143.

Check the condition of the wiring inside the EPAS and make sure that the 3 white EPAS connectors are correctlylocked.If the fault is still present, contact the Techline.




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36B - 22V4MR-372-J84-36B000$462_eng.mif

EPAS

Vdiag No.: 05, 09

DF038PRESENT

OR

STORED

ANGLE SENSOR1.DEF: Sensor internal electrical fault2.DEF: Absence of sensor signal

3.DEF: Values outside limits

NOTES

Conditions for applying the fault finding procedure to stored faults:The fault is declared present after having started the engine and turned the steeringwheel from lock to lock.

Notes:

This fault causes an absence of steering wheel return (no warning light or message). The computer records an occurrence context (computer operating values frozen


Procedure to apply for internal fault codes 195 and 196 of PR143.

Position the vehicle wheels in the straight line driving position (steering centre point).Refer to parameters PR121 Steering wheel angle and PR007 Steering wheel angle offset compensation.Both parameters must be between - 10 < X < 10.Turn the steering wheel to full right lock then to full left lock, and check that the parameter varies within thetolerances given in the Conformity check.


If parameters PR121, PR007 and status ET020 are not correct:Place the vehicle on a front axle adjusting bench.Position the vehicle wheels in the straight line driving position (steering centre point).Program the steering wheel angle via command VP004 Steering wheel angle sensor programming (seeConfiguration and programming, section A).

Remove the fault, start the engine and check that the EPAS functions correctly by turning the steering wheel fromlock to lock (parking manoeuvres).





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EPAS

Vdiag No.: 05, 09

DF038

CONTINUED

Procedure to apply for internal fault codes 192, 193 and 194 of PR143.

Check the fault occurrence context forinternal fault codes 193 and 194. IfPR108 Computer supply voltageis less than 10 V, the fault is due to a battery undervoltage.

Check the vehicle battery voltage.Check the tightness and the condition of the battery terminals.Check the charge circuit if necessary.

Check the condition of the 3 white EPAS connectors and check that they are locked correctly.

In the event of a fault, check the insulation, continuity and the absence of interference resistance on thefollowing connection:

2-track connectortrack 1 + 12 V before ignition feed





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36B - 24V4MR-372-J84-36B000$462_eng.mif

EPAS

Vdiag No.: 05, 09

DF053PRESENT

COMPUTER CONFIGURATIONDEF : Computer calibration not carried out

NOTES

Priority in the event of a number of faults:Deal with fault DF020 Computer supply first, if it is present or stored.

Notes:This fault is present for as long as the computer assistance strategy is not configured.

It is automatically cleared after configuration.This fault causes:Degraded assistance (no message or warning light).

Check that the computer's configuration correctly corresponds to the vehicle type, engine type, gearbox and tyresfitted on the vehicle.Reconfigure the computer if necessary (see Configuration and programming).If the fault is still present, contact the Techline.


DAE_V05_DF053P/DAE_V09_DF053P


25/59



36B - 25V4MR-372-J84-36B000$462_eng.mif

EPAS

Vdiag No.: 05, 09

DF054PRESENT

OR

STORED

TORQUE SENSORDEF : Sensor internal electronic fault

NOTES

Conditions for applying the fault finding procedure to stored faults:The fault is declared present after the engine was started and after turning the steeringwheel from lock to lock, then returning it to the centre.

Notes:

This fault causes:Loss or absence of steering assistance with STOP warning light + Message lightingup.

The computer records an occurrence context (computer operating values frozenwhen fault occurs). To view this information, click on the fault description (camerasymbol).Within these values, parameterPR143 Internal fault code gives the fault findingprocedure to apply.If, in the fault occurrence context (computer operating values frozen when fault

occurs) PR108 Computer supply voltage is less than 10 V, check the batteryvoltage, the tightness and the condition of the battery terminals and check thecharging circuit.



Procedure to apply for internal fault codes 48, 66, 64, 65 and 67 of PR143.

Check the condition of the 3 white EPAS connectors and check that they are locked correctly.





26/59



36B - 26V4MR-372-J84-36B000$462_eng.mif

EPAS

Vdiag No.: 05, 09

DF055PRESENT

OR

STORED

COMPUTER MEMORYDEF : EEPROM irregularity

NOTES

Conditions for applying the fault finding procedure to stored faults:The fault is declared present after the engine was started and after turning the steeringwheel from lock to lock, then returning it to the centre.

Notes:

This fault leads to degraded assistance with no warning light or message or anassistance that is limited to 10 % with the SERVICE indicator light + Message. Risk of ESP fault. The computer records an occurrence context (computer operating values frozen



Check status ET020 Steering wheel angle programming which should be STATUS 4; if not, program thesteering wheel angle sensorVP004 Steering wheel angle programming (see Configuration andprogramming).

If the fault is still present after the ignition has been switched on several times, contact the Techline.






27/59



36B - 27V4MR-372-J84-36B000$462_eng.mif

EPAS

Vdiag No.: 05, 09

DF057PRESENT

OR

STORED

MULTIPLEX VEHICLE SPEED SIGNALDEF : Invalid signal

NOTES

Conditions for applying the fault finding procedure to stored faults:The fault is declared present after a road test.

Notes:This fault causes an unsuitable level of assistance and the SERVICE indicator light

+ Message come on.

Carry out fault finding on the multiplex network, and repair if necessary.

Carry out fault finding on the ABS (see 38C, Anti-lock braking system). If the ABS signals no fault and the EPASis the only system signalling the fault, contact the Techline.




28/59


Fault finding - Conformity check 36B

36B - 28V4MR-372-J84-36B000$528_eng.mif

EPAS

Vdiag No.: 05, 09


Fault finding - Conformity check

MAIN SCREEN

NOTES

Only check the conformity after a complete check with the diagnostic tool.Application conditions: engine stopped with the ignition on, without moving thesteering wheel, WHEELS STRAIGHT AHEAD (straight line driving).

Order FunctionParameter or Status checked

or ActionDisplay and

NotesFault finding

1Computer

electrical supply

PR108:Computer feed

voltage

10 V < X

< 13 V

In the event of a fault with thisparameter, check the

insulation, continuity and

absence of interferenceresistance on the computer

earths and feeds (see wiringdiagrams). If the fault is stillpresent, carry out faultfinding on the charge

circuit.

2Steering wheel

angleET020:

Steering wheel anglesensor programming

STATUS 4

In the event of a fault, apply

the interpretation of statusET020.

3 Multiplex signals

ET023: Engine operationSTOPPED or

STALLED

In the event of a fault, carryout fault finding on the

injection system and the

multiplex network.

PR003: Vehicle speed 0 mphIn the event of a fault, carryout fault finding on the ABSand the multiplex network.

4Steering motor

powerPR012:

Current absorbed bythe motor

0 A (+ 1 A)In the event of a fault, apply

the interpretation of parameterPR012.

5 Assistance PR014:Level of assistance

available

100 % (butassistance

unavailable)

In the event of a fault, applythe interpretation of parameter

PR014.

6 Temperature PR008:Computer

temperature0 C < X< 75 C

In the event of a fault, applythe interpretation of faultDF001 Motor thermal

protection.

DAE_V05_CCONF/DAE_V09_CCONF

MR-372-J84-36B000$528_eng.mif


29/59



36B - 29V4MR-372-J84-36B000$528_eng.mif

EPAS

Vdiag No.: 05, 09

Sub-function: assistance

NOTES



or ActionDisplay and Notes Fault finding

1Steering wheel

angle

ET020:Steering wheel anglesensor programming

STATUS 4

In the event of a fault,apply the

interpretation of status

ET020.

PR121: Steering wheel angle - 10 d < X < 10 d


interpretation ofparameterPR121.

PR007:Steering wheel angle

drift compensation- 10 d < X < 10 d



2 Torque

PR001:Torque applied to the

steering wheel0 Nm (+ 0.2 Nm)



PR006:Steering motor torque

setpoint0 Nm (+ 0.2 Nm)



3 Assistance PR014:Level of assistance

available

100 % (butassistance

unavailable)



4 Computer ET026: Computer calibrationConfig. 1 < X

< Config. 5


interpretation of statusET026.


30/59



36B - 30V4MR-372-J84-36B000$528_eng.mif

EPAS

Vdiag No.: 05, 09

Sub-function: assistance (continued)

NOTES



or ActionDisplay and Notes Fault finding

5 Multiplex signals PR003: Vehicle speed 0 mph

In the event of a fault,carry out fault findingon the ABS and the

multiplex network.

6Steering motor

power

PR013:Setpoint for current

absorbed by themotor

0 A (+ 1 A)



PR012:Current absorbed by

the motor0 A (+ 1 A)




31/59



36B - 31V4MR-372-J84-36B000$528_eng.mif

EPAS

Vdiag No.: 05, 09

Sub-function: power

NOTES


Order FunctionParameter or Statuschecked or Action

Display and Notes Fault finding

1Computer

electrical supply

PR108:Computer feed

voltage

10 V < X < 13 V



the absence of interferenceresistance on the computer

earths and feeds (see wiringdiagrams). If the fault is stillpresent, carry out faultfinding on the charge

circuit.

2 Temperatures

PR008:Computer

temperature0 C < X < 75 C

In the event of a fault, apply

the interpretation of faultDF001 Motor thermal

protection.

PR009:Steering motor

temperature

0 C < X < 130 C

In the event of a fault, applythe interpretation of fault

DF001 Motor thermalprotection.

3 Multiplex signals ET023:Engine

operationSTOPPED or

STALLED

In the event of a fault, carryout fault finding on the

injection system and themultiplex network.


32/59



36B - 32V4MR-372-J84-36B000$528_eng.mif

EPAS

Vdiag No.: 05, 09

MAIN SCREEN

NOTES

Only check the conformity after a complete check with the diagnostic tool.Test conditions: engine at idling speed.STRAIGHT WHEELS (driving in a straight line).


Display andNotes

Fault finding

1Computer

electrical supply

PR108:Computer feed

voltage

12 V < X < 16 V



absence of interferenceresistance on the computer

earths and feeds (see wiringdiagrams). If the fault is stillpresent, carry out the faultfinding procedure on the

charge circuit.

2Steering wheel

angleET020:

Steering wheel

angle sensorprogramming

STATUS 4In the event of a fault, apply theinterpretation of status ET020.

3 Multiplex signals

ET023: Engine operation RUNNING

In the event of a fault, carry outfault finding on the injection

system and the multiplex

network.

PR003: Vehicle speed 0 mphIn the event of a fault, carry outfault finding on the ABS and the

multiplex network.

4Steering motor

powerPR012:

Current absorbedby the motor

Without movingthe steering

wheel:0 A ( 1 A)Moving the

steering wheel:- 96 A < X < 96 A

In the event of a fault, apply theinterpretation of parameter

PR012.

5 Assistance PR014:Level of

assistanceavailable

100 %(maximumassistance)

In the event of a fault, apply theinterpretation of parameter

PR014.

6 Temperature PR008:Computer


In the event of a fault, apply theinterpretation of fault DF001Motor thermal protection.


33/59



36B - 33V4MR-372-J84-36B000$528_eng.mif

EPAS

Vdiag No.: 05, 09

Sub-function: assistance

NOTESOnly check the conformity after a complete check with the diagnostic tool.Test conditions: engine at idling speed.



1Steering wheel

angle

ET020:Steering wheelangle sensorprogramming

STATUS 4


interpretation of statusET020.

PR121:Steering wheel

angle

- 10 d < X < 10 d

Moving the steering wheel:- 585 < X < + 585



PR007:Steering wheel

angle driftcompensation

- 10 d < X < 10 d



2 Torque

PR001:Torque appliedto the steering

wheel

Without moving thesteering wheel:

0 N.m ( 0.2 N.m)Moving the steering wheel:- 14 N.m < X < + 14 N.m



PR006:Steering motortorque setpoint


0 N.m ( 0.2 N.m)Moving the steering wheel:

- 5 N.m < X < + 5 N.m



3 Assistance PR014:Level of

assistanceavailable

100 % (maximumassistance)



4 Computer ET026: Computercalibration

Config. 1 < X < Config. 5

In the event of a fault,

apply theinterpretation of status

ET026.


34/59



36B - 34V4MR-372-J84-36B000$528_eng.mif

EPAS

Vdiag No.: 05, 09

Sub-function: assistance (continued)




5 Multiplex signals PR003: Vehicle speed 0 mph

In the event of a fault,carry out fault findingon the ABS and themultiplex network.

6Steering motor

power

PR013:Setpoint for

current absorbedby the motor


0 A ( 1 A)Moving the steering wheel:

- 96 A < X < 96 A

In the event of a fault,

apply theinterpretation of

parameterPR013.

PR012:Current

absorbed by themotor


0 A ( 1 A)Moving the steering wheel:

- 96 A < X < 96 A




35/59



36B - 35V4MR-372-J84-36B000$528_eng.mif

EPAS

Vdiag No.: 05, 09

Sub-function: power



Display andNotes

Fault finding

1Computer

electrical supplyPR108:

Computer feedvoltage

12 V < X < 16 V


insulation, continuity and theabsence of interference

resistance on the computerearths and feeds (see wiring

diagrams). If the fault is stillpresent, carry out fault findingon the charge circuit.

2 Temperatures

PR008:Computer



PR009:Steering motor



3 Multiplex signals ET023:Engine

operation RUNNING

In the event of a fault, carry outfault finding on the injectionsystem and the multiplex

network.


36/59


Fault finding - Status summary table 36B

36B - 36V4MR-372-J84-36B000$594_eng.mif

EPAS

Vdiag No.: 05, 09


Fault finding - Status summary table

Tool status Diagnostic tool title

ET020 Steering wheel angle sensor programming

ET023 Engine operationET026 Computer calibration

MR-372-J84-36B000$594_eng.mif


37/59


Fault finding - Interpretation of statuses 36B

36B - 37V4MR-372-J84-36B000$660_eng.mif

EPAS

Vdiag No.: 05, 09


Fault finding - Interpretation of statuses

ET020

PROGRAMMING THE STEERING WHEEL ANGLE SENSOR

NOTES

Special note: This status is declared correct when it is STATUS 4 (normal mode); in any other

case, apply this fault finding procedure. The SERVICE indicator light will come on if the steering wheel angle calibration has

not been carried out.

VARIOUS POSSIBLE STATUS VALUES (with the meaning):

STATUS 1 Straight ahead wheel position not programmed. Invalid angle value.PROGRAMMING NOT COMPLETE.

STATUS 3 Straight ahead wheel position not programmed. Invalid angle value. Steering wheel out of range 120 when after ignition

is switched on.PROGRAMMING COMPLETE, ANGLE TO BECONFIRMED.

STATUS 2 Straight ahead wheel position not programmed. Invalid angle value.

PROGRAMMING NOT COMPLETE.

STATUS 4 Straight ahead wheel position not programmed. Valid angle value.

PROGRAMMING COMPLETE

STATUS 1 or STATUS 2

If the status is STATUS 1 orSTATUS 2, program the steering wheel angle (see Configuration andprogramming).

STATUS 3

If the status is STATUS 3, turn the steering wheel from right lock to left lock then slowly return it to slightly beyondthe centre point (PR135 Column rotation speed less than 200/s). The status should become STATUS 4.

Note:A present or stored fault can impede "STATUS 4 (carry out the necessary operations by referring to the FaultFinding Manual).

AFTER REPAIR Carry out a check using the diagnostic tool.

DAE_V05_ET020/DAE_V09_ET020

MR-372-J84-36B000$660_eng.mif


38/59



36B - 38V4MR-372-J84-36B000$660_eng.mif

EPAS

Vdiag No.: 05, 09

ET023

ENGINE OPERATION

NOTES

Special note:This signal comes from the injection computer and is transmitted to the Electric PowerAssisted Steering computer via the multiplex network.

STOPPED: The engine has not yet been started, or has been stopped normally with the starterbutton.

STALLED: The engine has been stopped, but it stopped abnormally, without using the starter button.This status may appear for a brief moment during a normal engine stop.

RUNNING: The engine is currently in operation.

STARTING: The engine is currently being activated by the starter.

If the status does not correspond to the actual operation of the engine, carry out fault finding on the multiplexnetwork (see 88B, Multiplexing) and on the injection (see 13B, Diesel injection and 17B, Petrol injection)using the diagnostic tool.




39/59



36B - 39V4MR-372-J84-36B000$660_eng.mif

EPAS

Vdiag No.: 05, 09

ET026

COMPUTER CALIBRATION

NOTES None

Between config. 1 and config. 5.Use the diagnostic tool to check that the configuration correctly corresponds to the vehicle criteria.

If the status is config. 0, the calibration has not been carried out.Calibrate the computer using command SC001 Computer calibration (see configuration and programming).




40/59

POWER ASSISTED STEERING36B

36B - 40V4MR-372-J84-36B000$726_eng.mif

EPAS

Vdiag No.: 05, 09


Fault finding - Parameter summary table

Tool parameter Diagnostic tool title

PR001 Torque applied to the steering wheel

PR003 Vehicle speedPR006 Steering motor torque setpoint

PR007 Steering wheel angle drift compensation

PR008 Computer temperature

PR009 Steering motor temperature

PR012 Current absorbed by the motor

PR013 Setpoint for current absorbed by the motor

PR014 Level of assistance available

PR108 Computer feed voltage

PR121 Steering wheel angle

MR-372-J84-36B000$726_eng.mif


41/59


Fault finding - Parameter interpretation 36B

36B - 41V4MR-372-J84-36B000$792_eng.mif

EPAS

Vdiag No.: 05, 09


Fault finding - Parameter interpretation

PR001

TORQUE APPLIED TO THE STEERING WHEEL

NOTES None.

This parameter indicates the torque applied by the driver to the steering column. It is positive when the steeringwheel is turned to the right and negative when it is turned to the left.

If the parameter does not correspond to the values indicated in the Conformity check, refer to the interpretationof fault DF054 Torque sensor.


DAE_V05_PR001/DAE_V09_PR001

MR-372-J84-36B000$792_eng.mif


42/59



36B - 42V4MR-372-J84-36B000$792_eng.mif

EPAS

Vdiag No.: 05, 09

PR006

STEERING MOTOR TORQUE SETPOINT

NOTES None.

This parameter indicates the torque setpoint sent by the EPAS computer to the steering motor. It is positive whenthe steering wheel is turned to the right and negative when it is turned to the left.

If the parameter is not in conformity with the values shown in the Conformity check, refer to the interpretation offault DF035 Variable power-assisted steering motor.




43/59



36B - 43V4MR-372-J84-36B000$792_eng.mif

EPAS

Vdiag No.: 05, 09

PR007

STEERING WHEEL ANGLE DRIFT COMPENSATION

NOTES None.

This parameter shows the correction of the angle value, implemented automatically by the EPAS computer. Whendriving, if the steering wheel angle in the straight-ahead driving position is not 0, this parameter varies (offset fromthe steering wheel angle value).

If the value of the parameter is different to 0 d ( 10 d), check the value of parameterPR121 Steering wheelangle, with the wheels set straight-ahead, ifPR121 > 10 d program the steering wheel angle using commandVP004 Steering wheel angle sensor programming (see Configuration and programming, section C).IfPR121 < 10 dand the vehicle is fitted with ESP, place the vehicle on a geometry test bench (front axle testbench). Position the vehicle wheels in the straight line driving position (steering centre point).

Program the steering wheel angle using command VP004 Steering wheel angle sensor programming (seeConfiguration and programming).




44/59



36B - 44V4MR-372-J84-36B000$792_eng.mif

EPAS

Vdiag No.: 05, 09

PR012PR013

CURRENT ABSORBED BY THE MOTOR

SETPOINT FOR CURRENT ABSORBED BY THE MOTOR

NOTES None.

ParameterPR013 indicates the electrical power (strength) setpoint sent by the EPAS computer to the steeringmotor as a function of the torque applied to the steering wheel.ParameterPR012 indicates the electrical power actually consumed by the EPAS motor.

These two parameters are positive when the steering wheel is turned to the right and negative when turned to theleft.

The value of parameterPR013 Motor power setpoint should be almost equal to the value of parameterPR012Power absorbed by the motor.If the parameters do not correspond with the values shown in the Conformity check, or if they are not equal, refer

to the interpretation of fault DF035 Variable power steering motor.


DAE_V05_PR012/DAE_V05_PR013/DAE_V09_PR012/DAE_V09_PR013


45/59



36B - 45V4MR-372-J84-36B000$792_eng.mif

EPAS

Vdiag No.: 05, 09

PR014

LEVEL OF ASSISTANCE AVAILABLE

NOTES None.

In normal operation, this parameter shows the steering assistance value which depends on the level of motorprotection.When the user holds the steering at full lock for more than 0.5 seconds, assistance drops to 52 %.

This parameter can fall below 100 % when the EPAS system is heated during repeated manoeuvres; this storesfault DF001 Motor thermal protection if the heating lasts longer than 1 minute.

Note:The level of assistance can be degraded according to system faults (see Fault summary table).




46/59



36B - 46V4MR-372-J84-36B000$792_eng.mif

EPAS

Vdiag No.: 05, 09

PR121

STEERING WHEEL ANGLE

NOTES None.

This parameter shows the steering wheel position in relation to the programmed zero (performed by commandVP004 Steering wheel angle sensor programming).This parameter is positive to the right and negative to the left.

If the angle remains at 3696, either: the steering wheel angle programming has not been carried out (ET020 Steering wheel angle programming

is STATUS 1 orSTATUS 2), or the steering wheel is outside the range 120 d (ET020 Steering wheel angle programming is STATUS 3),

when the APC is switched on, therefore the angle is valid; the angle is STATUS 4 only if the steering wheel is

within the range 120 d. As the sensor's coverage is not complete, it needs to come within this zone to detectits position.

Thus, when the APC is switched on, if the steering wheel is not within the range 120 d then the angle is invalid(ET020 Steering wheel angle programming is STATUS 3). Simply rotating the steering wheel so that it is in the 120 d range will allow a valid angle to be found (ET020 Steering wheel angle programming is STATUS 4),when the EPAS is operating correctly, the sensor is faulty DF038 Angle sensor.

If the angle remains at 3696, with action on the steering wheel and status ET020 Steering wheel angleprogramming is STATUS 4, contact the Techline.

If the parameter does not correspond to the values shown in the Conformity check, place the vehicle on ageometry test bench (front axle bench). Position the vehicle wheels in the straight line driving position (steeringcentre point).Program the steering wheel angle using command VP004 Steering wheel angle sensor programming (seeConfiguration and programming).




47/59


Fault finding - Customer complaints 36B

36B - 47V4MR-372-J84-36B000$858_eng.mif

EPAS

Vdiag No.: 05, 09


Fault finding - Customer complaints

NOTESOnly refer to the customer complaints after performing a complete check using thediagnostic tool.

NO DIALOGUE WITH THE COMPUTER ALP1

LOSS OF VEHICLE ASSISTANCE WITHOUT WARNING ALP2

POOR VEHICLE HANDLING ALP3

THE STEERING WHEEL DOES NOT RETURN BY ITSELFTO THE CENTRE AT LOW SPEED: STEERING WHEELRETURN TO CENTRE POINT INACTIVE

ALP4

UNDER-ASSISTANCE AT LOW SPEED ANDOVER-ASSISTANCE AT HIGH SPEED WITHOUTWARNING

ALP5

TOO LITTLE ASSISTANCE ALP6

ASSISTANCE AVAILABLE FOR 5 MIN. AFTERSWITCHING OFF THE IGNITION

ALP7

ASSISTANCE AVAILABLE BUT CHECK STEERINGWARNING MESSAGE DISPLAYED AND SERVICEINDICATOR LIGHT CONTINUOUSLY LIT

ALP8

THE VEHICLE PULLS TO THE RIGHT OR TO THE LEFT ALP9

SERVICE INDICATOR LIGHT AND CHECK STEERINGMESSAGE COME ON STRAIGHT AWAY

ALP10

STEERING ASSISTANCE IS AVAILABLE WITH IGNITIONON AND ENGINE STOPPED, WITH NO WARNING

ALP11

THE ENGINE DOES NOT START AND THE MESSAGE"STEERING NOT UNLOCKED"OR"STEERING NOT LOCKED" IS DISPLAYED AFTERSWITCHING THE IGNITION OFF

ALP12

MR-372-J84-36B000$858_eng.mif


48/59


Fault finding - Fault finding chart 36B

36B - 48V4MR-372-J84-36B000$924_eng.mif

EPAS

Vdiag No.: 05, 09


Fault finding - Fault finding chart

ALP1 No dialogue with the computer

NOTES None.

Run fault finding on the multiplex network.

Check the voltage of the vehicle battery (the EPAS system only reacts between 10 V and 18 V).Repair if necessary.

Try the diagnostic tool on another vehicle.

Check: the connection between the diagnostic tool and the diagnostic probe (lead in good condition), the connection between the diagnostic lead and the diagnostic socket (lead in good condition).

Check the condition of the EPAS fuses and their contacts:80A BP81 Power fuse in the engine fuse box.5A AP44 + after ignition fuse on the UPC.

Check for the presence of+ 12 V battery on track 16, and + 12 V after ignition feed on track 1 and an earth ontrack 5 and on track 4 of the diagnostic socket.Repair if necessary.

Disconnect the two EPAS computer connectors.Check the condition and conformity of the connectors and their clips.Check the conformity of the electrical supplies (they must be equal to the battery voltage).Electric Power Assisted Steering Computer Connector:

2-track connectortrack 1 + Battery feed

2-track connectortrack 2 Earth

8-track connectortrack 8 + After ignition feed


Check the insulation, continuity and the absence of interference resistance on the wiring harness between

the diagnostic socket and the electric power-assisted steering computer connector.Electric Power Assisted Steering Computer Connector:

8-track connectortrack 5 track 14 Diagnostic socket

8-track connectortrack 7 track 6 Diagnostic socket




DAE_V05_ALP1/DAE_V09_ALP1

MR-372-J84-36B000$924_eng.mif


49/59



36B - 49V4MR-372-J84-36B000$924_eng.mif

EPAS

Vdiag No.: 05, 09

ALP2 Loss of vehicle assistance without warning

NOTES Only consult this customer complaint after a complete check with the diagnostic tool.

The vehicle is no longer assisted if the Electric Power Steering fuse is damaged or supply is lost. The steering isequivalent to manual steering, manoeuvrable when driving even at low speeds, but very difficult to manoeuvrewhen stopped.Since it is no longer being supplied, the EPAS computer is not capable of lighting the warning light, but theinstrument panel lights the STOP warning light + Message 4 seconds after the loss of the feed causing the loss

of assistance.The driver will only become aware of the fault through noticing the loss of assistance at the steering wheel.

Check the fuses for the electric power-assisted steering:80A BP81 Power fuse in the engine fuse box.5A AP44 + after ignition fuse on the UPC.Check the condition of the electric power-assisted steering connectors and repair if necessary.Check that the electrical feeds to the computer are correct:

2-track connectortrack 2 vehicle earth

2-track connectortrack 1 + battery feed

8-track connectortrack 8 + After ignition feed

Repair if necessary.Check the insulation, continuity and the absence of interference resistance on the connections between the electricpower-assisted steering computer and the instrument panel.

8-track connector, track 6 track 30 of the instrument panel

8-track connectortrack 4 track 29 of the instrument panel

Check that the steering column and steering rack are in sound mechanical condition.Repair if necessary.

Make sure that the front axle components, such as the track rod ends and shock absorber base plates, are in soundmechanical condition.Repair if necessary.





50/59



36B - 50V4MR-372-J84-36B000$924_eng.mif

EPAS

Vdiag No.: 05, 09

ALP3 Poor vehicle handling


Check the pressures and condition of the tyres, the condition of the joints and the front axle geometry.Check the vehicle battery voltage and the condition of the battery terminals.Repair if necessary.

Check the status and presence of the Electric Power Steering system power supply fuse.


Check the insulation, continuity and absence of interference resistance on the wiring harness between thebattery and the 2-track EPAS connector.Repair if necessary.

Check that status ET026 Computer calibration corresponds to the vehicle equipment.Configure the computer correctly using the diagnostic tool, if necessary (see Configuration and Programming).If the fault is still present, contact the Techline.




51/59



36B - 51V4MR-372-J84-36B000$924_eng.mif

EPAS

Vdiag No.: 05, 09

ALP4The steering wheel does not return by itself to the centre at low

speed: steering wheel return to centre point inactive


Check that the casing under the steering wheel does not rub on the steering column or steering wheel.

Check the pressures and condition of the tyres, the condition of the joints and the front axle geometry.

Check the vehicle battery voltage.Check the charge circuit if necessary.


Position the vehicle wheels in the straight line driving position (steering centre point).Refer to parameters PR121 Steering wheel angle which must be in the range - 10 d < X < 10 d and PR007Steering wheel angle offset compensation which must be in the range - 10 d < X < 10 d.Turn the steering wheel to full right lock then to full left lock, and check that the parameter varies within thetolerances given in the Conformity check.

If parameters PR121, PR007 and status ET020 listed above are not correct:Place the vehicle on a front axle adjusting bench.Position the vehicle wheels in the straight line driving position (steering centre point).Program the steering wheel angle using command VP004 Steering wheel angle sensor programming (see

Configuration and programming).





52/59



36B - 52V4MR-372-J84-36B000$924_eng.mif

EPAS

Vdiag No.: 05, 09

ALP5Under-assistance at low speed and over-assistance at high

speed without warning

NOTES None.


Check that parameterPR003 Vehicle speed is correct (see Conformity check).

Test the multiplex network.Repair if necessary.

If the fault is still present, contact Techline.




53/59



36B - 53V4MR-372-J84-36B000$924_eng.mif

EPAS

Vdiag No.: 05, 09

ALP6 Too little assistance

NOTESNote:With the steering wheel on full lock, assistance is reduced after0.5 seconds.

Check the pressures and condition of the tyres, the condition of the joints and the front axle geometry.


Do not operate the EPAS for at least 1 hour.Check that parameters PR008 Computer temperature, PR009 Steering motor temperature and PR014Assistance level available are correct (see Conformity check).Make sure that no component located in the vicinity of the electric power-assisted steering system causes anabnormal temperature rise in the system.


Note:After the steering system has been heated a number of times, the EPAS limits assistance itself to protect itselectrical components.It is normal for the system to do this.




54/59



36B - 54V4MR-372-J84-36B000$924_eng.mif

EPAS

Vdiag No.: 05, 09

ALP7 Assistance available for 5 minutes after switching off the ignition

NOTES

Note:This fault may arise if the vehicle speed multiplex signal is faulty or if the ignition isswitched off before the vehicle has come to a complete halt.


Check that parameterPR003 Vehicle speed is correct (see Conformity check).

Run a multiplex network test (see 88B, Multiplex).Repair if necessary.

Carry out fault finding on the injection system (see 13B, Diesel injection and 17B, Petrol injection).Repair if necessary.

Check the fuses for the electric power-assisted steering:5A AP44 + after ignition fuse on the Protection and Switching Unit.Repair if necessary.

Check the conformity of the + 12 after ignition feed for the computer:Electric Power Assisted Steering Computer Connector:

8-track connectortrack 8 + After ignition feedRepair if necessary.





55/59



36B - 55V4MR-372-J84-36B000$924_eng.mif

EPAS

Vdiag No.: 05, 09

ALP8Assistance available but Check Steering warning message

displayed and Service indicator light continuously lit

NOTES None

Check the vehicle battery voltage and the condition of the electric power-assisted steering connector.Repair and check the charge circuit if necessary.

Check status ET020 Steering wheel angle programming which should be STATUS 4. Otherwise, program thesteering wheel angle sensorVP004 Steering wheel angle programming (see Configuration and

programming).





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36B - 56V4MR-372-J84-36B000$924_eng.mif

EPAS

Vdiag No.: 05, 09

ALP9 The vehicle pulls to the right or to the left

NOTES None

Check that the casing under the steering wheel does not rub on the steering column or steering wheel.

Check the pressures and condition of the tyres, the condition of the joints and the front axle geometry.Repair if necessary.


Position the vehicle wheels in the straight line driving position (steering centre point).Refer to parameters PR121 Steering wheel angle which must be in the range - 10 d < X < 10 d and PR007Steering wheel angle offset compensation which must be in the range - 10 d < X < 10 d.Turn the steering wheel to full right lock then to full left lock, and check that the parameter varies within thetolerances given in the Conformity check.

Check the position of the steering wheel on the splines of the steering column.

If parameters PR121, PR007 and status ET020 listed above are not correct:Place the vehicle on a front axle adjusting bench.Position the vehicle wheels in the straight line driving position (steering centre point).Program the steering wheel angle using command VP004 Steering wheel angle sensor programming (see

Configuration and programming).





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36B - 57V4MR-372-J84-36B000$924_eng.mif

EPAS

Vdiag No.: 05, 09

ALP10The Service indicator light and the Check Steering message

come on straight away

NOTES None

Check the conformity of the battery voltage and carry out fault finding on the charge circuit if necessary.Check the condition and conformity of the ABS computer connector and its clips.Check that the ABS computer has an electrical feed (see wiring diagram for the ABS fitted on the vehicle).Disconnect the 8-track electric power assisted steering computer connector.Check the condition and conformity of the connector and its clips.


Carry out fault finding on the multiplex network, and repair if necessary.

Check the insulation, continuity and the absence ofinterference resistance on the following connections:

EPAS computer(8-track connector)

UCH(PE2 40-trackconnector)

Protection andSwitching Unit(CT1 12-trackconnector)

track 7 track 8

track 5 track 18

track 6 track 8

track 16 track 1

track 3 ABS computer

track 2 ABS computer (see wiringdiagram of the ABSsystem installed inthe vehicle)


If the previously checked connections are in conformity, contact the Techline.




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36B - 58V4MR-372-J84-36B000$924_eng.mif

EPAS

Vdiag No.: 05, 09

ALP11Steering assistance is available with ignition on and engine

stopped, with no warning

NOTES

Note:This fault may arise if the multiplex signal for the operating status of the engine is faultyor after the ignition is switched off and quickly back on without the engine being started.Ask the client if he does actually operate the vehicle incorrectly in this way beforeapplying this fault finding procedure. If necessary, explain correct operation to him.

Disconnect the 8-track connectorfrom the EPAS computer.Check the condition and conformity of the connector and its clips.


Check the insulation, continuity and the absence ofinterference resistance on the following connections:

EPAS computer(8-track connector)

UCH(PE2 40-track connector)

Protection andSwitching Unit(CT1 12-track connector)

track 7 track 8

track 5 track 18

track 6 track 8

track 16 track 1

track 9 Injectioncomputer

track 7 Injectioncomputer(see wiringdiagram of theinjection installedin the vehicle)


Check the consistency of status ET023 Engine operation by comparison with the actual status of the engine.If the status is not correct, carry out fault finding on the multiplex network (see 88B, Multiplexing) and the injection(see 13B, Diesel injection and 17B, Petrol injection).Repair if necessary.





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Fault finding - Fault finding chart 36BEPAS

Vdiag No.: 05, 09

ALP12

The engine does not start and the message "steering not

unlocked" or "steering not locked" is displayed after switching

the ignition off

NOTES

Special notes:These messages are not displayed because of an electric power-assisted steeringfailure.

Check the UCH (see 87B, Passenger compartment connection unit)


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