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

36B-5
MR-413-X44-36B000$067.mif
V2
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

36B-11
MR-413-X44-36B000$268.mif
V2
POWER – ASSISTED STEERING
Fault finding – Function
EPAS
Vdiag No.: 04 - 08
36B
GENERAL OPERATION
On this vehicle, the steering system is power-assisted by an electric motor attached to the steering column.
The torque sensor and steering column angle sensor interpret any movement of the steering wheel as it is turned.
Assistance is provided by an electric motor which applies more or less torque to the steering column, in one direction
or the other.
A computer controls this assistance according to several vehicle environment parameters, including the vehicle
speed.
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 returns the steering wheel to the centre point when driving at low speeds (5 to 20 mph / 8 to 32 km/h) but not when
the vehicle is stationary. This function is normal on hydraulic power-assisted steering vehicles or vehicles without
assistance.
This function cannot be deactivated by the diagnostic tool.
Depending on the operating conditions and the operations performed on the vehicle before switching on the ignition,
the assistance system may take a certain amount of time to be activated after engine starting, for instance after
battery cut-off or switching off the ignition (see Configurations and programming).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 72 mph (120 km/h)
without active return. The EPAS sends a "Steering wheel angle signal" to the ABS/ESP computer.

36B-16
MR-413-X44-36B000$469.mif
V2
EPAS
Vdiag No.: 04 - 08
36B
DF001
PRESENT
OR
STOREDMOTOR THERMAL PROTECTION
DEF: Operating temperature too high
NOTESConditions 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 overheating either of the
Electric Power-Assisted Steering (EPAS) motor or of the computer during repeated
manoeuvres.This fault may appear after the steering wheel is moved repeatedly
(parking) and causes a gradual reduction in steering but the fault warning light does
not come on.
Use the diagnostic tool to check the conformity of PR129 Motor power (60 A) and PR130 Motor power (45 A)
(zero in absence of PR001 Torque applied to steering wheel).
Contact the Techline in the event of any nonconformity.
Check the conformity of the computer and steering column (45 or 60 A) in relation to the table below:
Left-hand drive Right-hand drive
Torque sensor wiring harness blue black
Motor wiring45 Agreen black
Motor wiring60 Ablue grey
45 A 60 A
Computer label yellow white
In the event of a nonconformity, consult "RENAULT NET" to repair the vehicle according to the technical vehicle
definition.
Disconnect the battery then allow the electric power-assisted steering to cool down.
Reconnect the battery, clear the faults, start the vehicle and check the operation of the electric power-assisted
steering by turning the steering wheel full lock to the left or right.
The fault should not recur in the next 30 seconds.
If the fault recurs as present or stored, contact the Techline.
AFTER REPAIRDeal with any other faults.
Clear the stored faults.
Check that the EPAS is working.
DAE_V04_DF001 /DAE_V08_DF001
POWER – ASSISTED STEERING
Fault finding – Interpretation of faults

36B-20
MR-413-X44-36B000$469.mif
V2
POWER – ASSISTED STEERING
Fault finding – Interpretation of faults
EPAS
Vdiag No.: 04 - 08
36B
DF028
PRESENT
OR
STOREDENGINE SPEED ABSENT
DEF: Open circuit, short circuit to earth or short circuit to + 12 V
NOTESConditions for applying the fault finding procedure to stored faults:
The fault is declared present after having started the engine and turned the steering
wheel from lock to lock, then returning it to the centre.
Notes:
This fault causes:
No assistance with illumination of the Fault warning light + STOP + Beep.
Use the Wiring Diagram Technical Note for New Twingo.
Start the vehicle and use the diagnostic tool to check the conformity of PR004 Engine speed (not zero).
If necessary, carry out a fault finding procedure on the injection system.
With + after ignition feed off, check the connection and condition (possible wiring damage) of the connector of
component 502 and its clips.
If the connector is faulty (see Technical Note 6015A, Repairing electrical wiring, Wiring: Precautions for
repair), repair the connector, otherwise replace the wiring.
With the connector of component 502 and intermediate connector R107 disconnected: check the insulation and
the continuity of connection H7 between component 502 and intermediate connector R107.
Connector of components 119 and 120 disconnected: check the insulation and the continuity of connection H7
between component 120 and intermediate connector R107.
If the connection or connections are faulty (see Technical Note 6015A, Electrical wiring repair, Wiring:
Precautions for repair), repair the wiring, otherwise replace the wiring.
If the fault is still present, contact the Techline.
AFTER REPAIRDeal with any other faults.
Clear the stored faults.
Check that the EPAS is working.
DAE_V04_DF028 /DAE_V08_DF028

36B-22
MR-413-X44-36B000$469.mif
V2
POWER – ASSISTED STEERING
Fault finding – Interpretation of faults36B
EPAS
Vdiag No.: 04
DF038
PRESENT
OR
STOREDANGLE SENSOR
DEF: Open circuit, short circuit to earth or short circuit to + 12 V
NOTESConditions for applying the fault finding procedure to stored faults:
The fault is declared present after having started the engine and turned the steering
wheel from lock to lock, then returning it to the centre.
Notes:
This fault causes:
Loss of the "active return" function with no fault warning light or Beep.
Use the Wiring Diagram Technical Note for New Twingo.
With + after ignition feed off, check the connection and condition (possible wiring damage) of the connector of
component 502 and its clips.
With + after ignition feed off, check the connection and condition (possible wiring damage) of connector E and its
clips of component 583.
If the connector is faulty (see Technical Note 6015A, Electrical wiring repair, Wiring:
Precautions for repair) repair the wiring, otherwise replace it.
Visually check the condition of the wiring harness of component 583 (for possible wiring damage).
If the connection or connections are faulty (see Technical Note 6015A, Electrical wiring repair, Wiring:
Precautions for repair), repair the wiring, otherwise replace the steering column.
With the connectors of components 502 and 583 disconnected: check the continuity and insulation of the
following connections between components 502 and 583:
●Connection 109F
●Connection 109Z
●Connection 109X
●Connection 109I
If the connection or connections are faulty (see Technical Note 6015A, Electrical wiring repair, Wiring:
Precautions for repair), repair the wiring, otherwise replace the steering column.
Check the condition of the tabs of the connections of component 502.
Contact the Techline in the event of any nonconformity.
If the fault is still present, contact the Techline.
AFTER REPAIRDeal with any other faults.
Clear the stored faults.
Check that the EPAS is working.
DAE_V04_DF038

36B-24
MR-413-X44-36B000$469.mif
V2
POWER – ASSISTED STEERING
Fault finding – Interpretation of faults
EPAS
Vdiag No.: 04 - 08
36B
DF043
PRESENT
OR
STOREDVEHICLE SPEED
DEF: Open circuit, short circuit to earth or to + 12 V
NOTESNotes:
This fault causes:
Assistance in defect mode with no fault warning light or Beep
(Insufficient assistance).
Use the Wiring Diagram Technical Note for New Twingo.
Carry out a road test.
Check the consistency of the speed signal on the instrument panel.
If necessary, carry out fault finding on the ABS/ESP system (see 38C, Anti-lock braking system).
Then use the diagnostic tool to check that PR003 is not zero.
With + after ignition feed off, check the connection and condition (possible wiring damage) of the connector of
component 502 and its clips.
If the connector is faulty (see Technical Note 6015A, Repairing electrical wiring, Wiring: Precautions for
repair), repair the connector, otherwise replace the wiring.
With the intermediate connector R107 and the connector of component 502 disconnected, check the continuity
and insulation of connection 47F between component 502 and intermediate connector R107.
With the connector of components 1579, 261 and 1094 disconnected: check the continuity and insulation of
connection 47F between component 1094 and intermediate connector R107.
If the connection or connections are faulty (see Technical Note 6015A, Electrical wiring repair, Wiring:
Precautions for repair), repair the wiring, otherwise replace the wiring.
If the checks reveal no faults, check the conformity of components 1579, 261 and 1094.
If the fault is still present, contact the Techline.
AFTER REPAIRDeal with any other faults.
Clear the stored faults.
Check that the EPAS is working.
DAE_V04_DF043/DAE_V08_DF043

36B-37
MR-413-X44-36B000$804.mif
V2
POWER – ASSISTED STEERING
Fault finding – Interpretation of parameters
EPAS
Vdiag No.: 04 - 08
36B
PR003
VEHICLE SPEED
NOTESNone.
This parameter indicates the vehicle speed sent by the ABS/ESP on the multiplex line.
If the parameter does not correspond to the values indicated in the Conformity check, consult the interpretation
of fault DF043 Vehicle speed.
AFTER REPAIRPerform a test using the diagnostic tool.
DAE_V04_PR003/DAE_V08_PR003