check engine light RENAULT SCENIC 2006 J84 / 2.G Power Assisted Steering Workshop Manual

POWER ASSISTED STEERING
Fault finding - System operation
36B
36B - 8V6 MR-366-X84-36B000$132_eng.mif
PAS
Vdiag No.: 04, 06, 08, 0C
and 12
SYSTEM OPERATION
On this vehicle, the steering system is power-assisted by an electric motor (mounted on the steering column). The
driver's actions are translated by a torque sensor, which measures the force applied to the steering wheel by the
driver, and by an angle measuring sensor. The steering wheel angle signal is used by the electronic stability program
computer for the trajectory control programming.
Assistance is provided by means of an electric motor which applies an appropriate 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.
NOTE
Depending on the operating conditions and the operations performed on the vehicle before switching on the ignition,
the assistance system may take a certain time to be activated after engine starting; this also applies after battery cut-
off or switching off the ignition.
Fault finding warning lights illumination programming:
Slow flashing of the Service warning light at 2 Hz: the electric power steering system is in fault finding mode.
Rapid flashing of the Service warning light at 8 Hz accompanied by the Check steering message: the steering
wheel angle sensor is not calibrated and not indexed.
Service warning light continuously lit with Check steering displayed on instrument panel: signal received by the
EPAS computer.
–assistance equal to that provided at a speed of 24 mph (40 km/h) if vehicle speed signal is absent or incorrect,
–angle sensor signal invalid: steering wheel angle sensor not calibrated (no active recall).
STOP warning light continuously lit with steering defective displayed on the instrument panel: fault in the EPAS
system.
If the fault is still present after repair, contact the Techline.
Angle sensor programming (initialisation)
The steering wheel angle sensor is initialised after the ignition is switched on. The sensor is not initialised until the
steering wheel has gone through a quarter turn left or right. If this turn is not carried out, the steering wheel angle
value reading will be 1.2 degrees higher or lower than the actual value.
Check consistency of ET020 Steering wheel angle sensor programming. Note:
If 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 fixed, unsatisfactory assistance.

POWER ASSISTED STEERING
Fault finding - Configurations and programming36B
36B - 11V6 MR-366-X84-36B000$330_eng.mif
PAS
Vdiag No.: 04, 06, 08, 0C
and 12POWER ASSISTED STEERING
Fault finding - Configurations and programming
VP004: STEERING WHEEL ANGLE SENSOR PROGRAMMING
NOTESThis programming procedure is performed after replacing the EPAS computer.
WARNING
Programming the steering wheel angle sensor means programming the 0 angle (wheels straight ahead position).
It must be done for any blank computer, and every time it is requested in this note.
The absence of or incorrect programming of this sensor will illuminate the Service warning light and create an
Electronic Stability Program fault.
OPERATIONS TO PERFORM BEFORE PROGRAMMING
–With the ignition on or engine running (to obtain maximum steering assistance), turn the steering wheel to full
left lock and then to full right lock,
–position the vehicle with the wheels straight ahead and the steering at the centre point (driving in a straight line),
–run the command by pressing the CONFIRM button,
–while the COMMAND IN PROGRESS message is displayed, turn the steering wheel a quarter of a turn from left
to right.
–Once the COMMAND COMPLETE message is displayed, exit fault finding mode (close dialogue with the
computer without switching off the tool) and then switch off the vehicle's ignition for 15 seconds minimum for
the programming to be registered.
Note:
To obtain a precise position with the wheels set straight ahead (driving in a straight line), this operation must be
performed on a front axle adjustment bench (especially for vehicles fitted with ESP).
OPERATIONS TO PERFORM AFTER PROGRAMMING
–Switch on the ignition and establish dialogue with the EPAS computer,
–turn the steering wheel to full left lock and then to full right lock,
–check that the programming has been properly registered: ET020 Steering wheel angle sensor programming
should be STATUS 4,
–check the conformity of the angle value by consulting parameter PR121 Steering wheel angle,
–check that there are no faults,
–carry out the necessary repairs, consulting the fault finding manual.
IMPORTANT
If the vehicle is fitted with ESP, establish dialogue with the ABS/ESP computer after the operation; if the function
is available (depending on computer version) clear the ESP sensor programming using command RZ003.
Make sure there are no ESP faults: make the necessary repairs, consulting the fault finding manual.
MR-366-X84-36B000$330_eng.mif

POWER ASSISTED STEERING
Fault finding - Customer complaints
36B
36B - 45V6 MR-366-X84-36B000$858_eng.mif
PAS
Vdiag No.: 04, 06, 08, 0C
and 12POWER ASSISTED STEERING
Fault finding - Customer complaints
NO DIALOGUE WITH THE COMPUTER ALP1
LOSS OF VEHICLE ASSISTANCE WITHOUT WARNING ALP2
POOR VEHICLE HANDLINGALP3
THE STEERING WHEEL DOES NOT RETURN BY ITSELF TO THE
CENTRE AT LOW VEHICLE SPEED: STEERING WHEEL SELF-
CENTRING INACTIVEALP4
UNDER-ASSISTANCE AT LOW SPEED AND OVER-ASSISTANCE AT
HIGH SPEEDALP5
TOO LITTLE ASSISTANCEALP6
ASSISTANCE AVAILABLE FOR 5 MIN. AFTER SWITCHING OFF THE
IGNITIONALP7
ASSISTANCE AVAILABLE BUT CHECK STEERING WARNING
MESSAGE DISPLAYED AND SERVICE WARNING LIGHT LIT
CONSTANTLY OR FLASHING AT 8 HzALP8
Vdiag 06 and 12 only
SERVICE INDICATOR LIGHT AND CHECK STEERING MESSAGE
COME ON STRAIGHT AWAYALP9
THE VEHICLE PULLS TO THE RIGHT OR TO THE LEFT ALP10
THE ENGINE DOES NOT START AND THE "STEERING NOT
UNLOCKED" IS DISPLAYED
OR
"STEERING NOT LOCKED" AFTER THE IGNITION IS SWITCHED
OFFALP11
MR-366-X84-36B000$858_eng.mif

POWER ASSISTED STEERING
Fault finding - Fault Finding Chart
36B
36B - 47V6 MR-366-X84-36B000$924_eng.mif
PAS
Vdiag No.: 04, 06, 08, 0C
and 12
ALP2 Loss of vehicle assistance without warning
NOTES–apply the ALP after a complete check with the diagnostic tool,
–check the conformity of ET026 Computer calibration.
The vehicle loses the assistance function if the electric power assisted steering fuse is broken or the power supply
is lost.
The driver will feel the loss of the assistance on the steering wheel. Steering will then be the same as for unassisted
steering, manoeuvrable when driving even at low speed, but very difficult to manoeuvre when stationary.
Without its power supply, the power-assisted steering computer can no longer illuminate the warning light, and so
the driver is not made aware of the fault.
Check the electric power-assisted steering and engine compartment fuses (70A) and the passenger compartment
fuse (5A).
Change the fuses if necessary.
Check the computer supply voltage:
Black 2-track connector track 1 Vehicle earth
Black 8-track connector track 8 Vehicle earth
If there is a repair procedure (see Technical Note 6015A, Repairing electrical wiring, Wiring: Precautions for
repair), repair the wiring, otherwise change the wiring.
Run a multiplex network test, and interpret any faults.
Check that the steering column and steering rack are in sound mechanical condition.
Repair if necessary.
Check that the front axle components, such as the track rod ends and shock absorber base plates, are in sound
mechanical condition.
Repair if necessary.
If the fault is still present, contact the Techline.
AFTER REPAIRCarry out a road test followed by a check with the diagnostic tool.
DAETRW_V04_ALP02/DAETRW_V08_ALP02/DAETRW_V06_ALP02/DAETRW_V0C_ALP02/
DAETRW_V12_ALP02