RENAULT TWINGO RS 2009 2.G Chasiss - Power Assisted Steering Workshop Manual

3Chassis
V2 Temp.mif
V2
36B
"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 the
manufacturer in the production of the various component units and accessories from
which his vehicles are constructed."
V2
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 part
reference numbering system is forbidden without the prior written authority of
Renault s.a.s.
© Renault s.a.s. 2007
POWER – ASSISTED STEERING
Fault finding – Introduction 36B - 2
Fault finding – List and location of components 36B - 7
Fault finding – Role of components 36B - 9
Fault finding – Function 36B - 10
Fault finding – Replacement of components 36B - 13
Fault finding – Configurations and programming 36B - 14
Fault finding – Fault summary table 36B - 15
Fault finding – Interpretation of faults 36B - 16
Fault finding – Conformity check 36B - 25
Fault finding – Status summary table 36B - 31
Fault finding – Interpretation of statuses 36B - 32
Fault finding – Parameter summary table 36B - 35
Fault finding – Interpretation of parameters 36B - 36
Fault finding – Customer complaints 36B - 42
Fault finding – Fault finding Chart 36B - 43

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POWER – ASSISTED STEERING
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-Schéma (CD-ROM), paper.
Type of diagnostic tools
–CLIP + multiplex line sensor
Special tooling required
3. REMINDERS
Procedure
To run diagnostics on the vehicle computers, proceed as follows:
–turn the ignition key to APC,
–connect the diagnostic tool and perform the required operations.
To cut off + after ignition feed, proceed as follows:
–disconnect the diagnostic tool,
–turn the ignition key to OFF,
–switch off the ignition. Vehicle(s): New Twingo
Function concerned: Electric power steeringComputer name: EPAS
Vdiag No.: 04 - 08
Special tooling required
Multimeter
Elé. 1681 Universal bornier
DAE_V04_PRELI/DAE_V08_PRELI
EPAS
Vdiag No.: 04 - 08
MR-413-X44-36B000$067.mif

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POWER – ASSISTED STEERING
Fault finding – Introduction
EPAS
Vdiag No.: 04 - 08
36B
Faults
Faults are declared present or stored (depending on whether they appeared in a certain context and have
disappeared since, or whether they remain present but are not diagnosed within the current context).
The present or stored status of faults should be taken into consideration when the diagnostic tool is switched on
after 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 on these lines (corrosion, bent pins, etc.),
–the resistance of the component detected as defective,
–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 the
data 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 customer
complaint.
–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 the
corresponding 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 by
customer complaints.
A summary of the overall procedure to follow is provided on the following page in
the form of a flow chart.

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EPAS
Vdiag No.: 04 - 08POWER – ASSISTED STEERING
Fault finding – Introduction36B
4. FAULT FINDING PROCEDURE
Perform a pre-diagnostic on the
system
Print the system fault finding log
(available on CLIP and in the
Workshop Repair Manual or
Technical Note)
Connect CLIP
no
Dialogue with
computer?
yes
Read the faults
no
Faults present
yes
Deal with present faults
Deal with stored faults
no
The cause is
still presentFault
solved
yes
See ALP no. 1
Conformity check
no
The cause is still
presentFault
solved
Use fault finding charts (ALPs)
no
The cause is still
presentFault
solved
Contact the Techline with the
completed fault finding log

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POWER – ASSISTED STEERING
Fault finding – Introduction
EPAS
Vdiag No.: 04 - 08
36B
4. FAULT FINDING PROCEDURE (CONTINUED)
Wiring check
Fault finding problems
Disconnecting 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 not
present when the analysis is made (stored fault).
Visual inspection of the connection:
Check that the connector is connected correctly and that the male and female parts of the connection are correctly
coupled.
Visual inspection of the area around the connection:
●Check the condition of the mounting (pin, strap, adhesive tape, etc.), that the connectors are attached
to the vehicle.
●Check that there is no damage to the wiring trim (sheath, foam, adhesive tape, etc.) near the wiring.
●Check that there is no damage to the electrical wires at the connector outputs, in particular on the
insulating material (wear, cuts, burns, etc.).
Disconnect the connector to continue the checks.
Visual inspection of the plastic casing:
●Check that there is no mechanical damage (casing crushed, cracked, broken, etc.), in particular to the
fragile components (lever, lock, openings, etc.).
●Check that there is no heat damage (casing melted, darker, deformed, etc.).
●Check that there are no stains (grease, mud, liquid, etc.).
Visual inspection of the metal contacts:
(The female contact is called CLIP. The male contact is called TAB.)
●Check that there are no bent contacts (the contact is not inserted correctly and can come out of the back
of the connector). The spring contact of the connector when the wire is pulled.
●Check that there is no damage (folded tabs, clips open too wide, blackened or melted contact, etc.).
●Check that there is no oxidation on the metal contacts. Note:
Carry out each requested check visually. Do not remove a connector if it is not required.
Note:
Repeated connections and disconnections alter the functionality of the connectors and increase the risk of poor
electrical contact. Limit the number of connections/disconnections as much as possible.
Note:
The check is carried out on the 2 parts of the connection. There may be two types of connections:
–Connector / Connector
–Connector / Device

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POWER – ASSISTED STEERING
Fault finding – Introduction
EPAS
Vdiag No.: 04 - 08
36B
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 warranty
reimbursement, and enables better analysis of the parts removed.
6. SAFETY INSTRUCTIONS
Safety rules must be observed during any work on a component to prevent any damage or injury:
–check the battery voltage to avoid incorrect operation of computer functions,
–use the appropriate tools,
–do not touch the discharge bulbs, and do not work on the COSLAD system when it is in operation, as the
voltage can be above 20,000 V. IMPORTANTIMPORTANT
Any fault on a complex system requires thorough fault finding with the appropriate tools.
The FAULT 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
the manufacturer.
IT IS THEREFORE ESSENTIAL THAT THE FAULT FINDING LOG IS FILLED OUT EVERY TIME IT IS
REQUESTED BY TECHLINE OR THE WARRANT RETURNS DEPARTMENT.

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POWER – ASSISTED STEERING
Fault finding – List and location of components
Figure 1: Computer and motor
1Engine
2Computer
Figure 2: Torque sensor and column adjustment handle
1Torque sensor
2Computer
3Column adjustment handle
1
2
3 1
2
EPAS
Vdiag No.: 04 - 08
MR-413-X44-36B000$134.mif

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EPAS
Vdiag No.: 04 - 08POWER – ASSISTED STEERING
Fault finding – List and location of components36B
Figure 3: Computer, Angle sensor and Motor
1Computer
2Angle sensor (on for Vdiag 04)
3Engine
31
2

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POWER – ASSISTED STEERING
Fault finding – Role of components
Angle sensor:
This sensor indicates the position of the steering wheel in real time (only for Vdiag 04).
Torque sensor:
This sensor enables the assistance torque to be controlled according to the force applied to the steering wheel by
the driver.
Computer:
This computer calculates the level of steering assistance required according to various parameters, including the
vehicle speed and the steering wheel torque.
Motor:
The motor provides the necessary steering torque assistance according to driver requirements. EPAS
Vdiag No.: 04 - 08
MR-413-X44-36B000$201.mif

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MR-413-X44-36B000$268.mif
V2
36B
POWER – ASSISTED STEERING
Fault finding – Function
Column steering system
1Computer
2Computer supply
3+ after ignition feed
4Vehicle speed
5Engine speed
6K line
7Fault warning light
8+ torque sensor
9Main signal
10 Secondary signal
11 0 V
12 + angle sensor (only in Vdiag 04)
13 Signal 1 (only in Vdiag 04)
14 Signal 2 (only in Vdiag 04)
15 0 V (only in Vdiag 04)
16 Brush motor supply
17 Power-assisted steering motor
18 Torque sensor
19 Angle sensor (only in Vdiag 04)
EPAS
Vdiag No.: 04 - 08
MR-413-X44-36B000$268.mif