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

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-15
MR-413-X44-36B000$469.mif
V2
36B
POWER – ASSISTED STEERING
Fault finding – Fault summary table
Tool fault Diagnostic tool titleAssociated
DTCCustomer complaints and warning
light coming on
DF001Motor thermal protection5660Steering assistance intermittent
reduction (no warning light or buzzer)
DF002Computer5640No assistance on start-up or sudden
loss of assistance with EPAS fault
warning light, STOP warning light and
buzzer
DF017Motor circuit5630Sudden loss of assistance with EPAS
fault warning light, STOP warning light
and buzzer
DF023+ after ignition feed5622Gradual loss of assistance with EPAS
fault warning light, STOP warning light
and buzzer
DF028Engine speed zero5621Incorrect level of assistance (no warning
light or buzzer)
DF037Battery voltage5650Sudden loss of assistance with EPAS
fault warning light, STOP warning light
and buzzer
DF038Angle sensor5610Loss of "active return" function with no
warning light
DF039Torque sensor circuit5603Sudden loss of assistance with EPAS
fault warning light, STOP warning light
and buzzer
DF043Vehicle speed5620Incorrect level of assistance (no warning
light or buzzer)
DF048Torque sensor circuit5602Sudden loss of assistance with EPAS
fault warning light, STOP warning light
and buzzer
DF050Torque sensor circuit signal 25601Sudden loss of assistance with EPAS
fault warning light, STOP warning light
and buzzer
DF054Torque sensor5600Sudden loss of assistance with EPAS
fault warning light, STOP warning light
and buzzer
EPAS
Vdiag No.: 04 - 08
MR-413-X44-36B000$469.mif

36B-23
MR-413-X44-36B000$469.mif
V2
POWER – ASSISTED STEERING
Fault finding – Interpretation of faults
EPAS
Vdiag No.: 04 - 08
36B
DF039
DF048
DF050
DF054
PRESENT
OR
STOREDTORQUE SENSOR CIRCUIT
TORQUE SENSOR CIRCUIT
TORQUE SENSOR CIRCUIT SIGNAL 2
TORQUE SENSOR
CO.O: Open circuit or short circuit to earth
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:
Sudden loss of steering assistance with illumination of the Fault warning light +
STOP + Beep.
Use the Wiring Diagram Technical Note for New Twingo.
With + after ignition feed off, check the connection and condition (possible wiring damage) of connector C and
its clips of component 502.
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 850 (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 850 disconnected, check the continuity and insulation of the
following connections between components 502 and 850.
●Connection 109K
●Connection 109M
●Connection 109N
●Connection 109P
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 + after ignition feed off, disconnect and check the condition and conformity of connector C and its clips.
Visually check the condition of the torque sensor wiring harness.
In the event of a nonconformity, replace the steering column.
Check the condition of the connection pins of components 502 and 850.
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_DF039/DAE_V08_DF039/DAE_V04_DF048/DAE_V08_DF048
DAE_V04_DF050/DAE_V08_DF050/DAE_V04_DF054/DAE_V08_DF054