ABS RENAULT SCENIC 2006 J84 / 2.G Power Assisted Steering Workshop Manual

POWER ASSISTED STEERING
Fault finding - Introduction
36B
36B - 5V6 MR-366-X84-36B000$066_eng.mif
PAS
Vdiag No.: 04, 06, 08, 0C
and 12
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:
Look for damage under the bonnet and in the passenger compartment.
Carefully check the fuses, insulation and wiring routing.
Look for signs of oxidation.
Tactile inspection:
While manipulating the wiring harness, use the diagnostic tool to note any change in fault status from stored to
present.
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 component:
Disconnect the connectors and check the appearance of the clips and tabs, as well as their crimping (no crimping on
the insulating section).
Make sure that the clips and tabs are properly locked in the sockets.
Make sure no clips or tabs have been dislodged during connection.
Check the clip contact pressure using an appropriate model of tab.
Resistance check:
Check 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.

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 - Conformity check
36B
36B - 25V6 MR-366-X84-36B000$528_eng.mif
PAS
Vdiag No.: 04, 06, 08, 0C
and 12POWER ASSISTED STEERING
Fault finding - Conformity check
MAIN SCREEN
NOTESOnly carry out this conformity check after a complete check with the diagnostic tool.
The values shown in this conformity check are given as examples.
Execution conditions: ENGINE STOPPED, IGNITION ON.
Order FunctionParameter or Status
checked or ActionDisplay and Notes Fault finding
1Steering wheel
angleET020:Steering wheel
angle sensor
programmingStatus 4: calibrated
and initialisedIn the event of a fault, consult
the interpretation of status
ET020.
2EngineET023:Engine
operationSTOPPED: engine
stopped.
STALLED: engine
stopped without using
the ignition keyIn the event of a fault, test the
multiplex network.
3Computer
supplyPR108:Computer feed
voltage9 V < X < 16 VIf the computer supply
voltage is not sufficient,
dialogue cannot be
established.
If PR108 is not correct, run
fault finding on the charge
circuit.
4Vehicle speedPR003:Vehicle speed0 mph (0 km/h) when
stationaryIn the event of a fault, test the
multiplex network.
5Electric motorPR012:Current
absorbed by the
motor0 A < X < 1 AWithout any action on the
steering wheel.
6Thermal
protectionPR119:Motor thermal
protection
indicatorInterior temperature
± 5 ˚CIf PR119 > 60˚C, thermal
protection is activated.
The assistance level PR140
= 15 %. To deactivate
thermal protection, do not
operate the EPAS for
15 minutes. PR014:Level of
assistance
available99 % or 0 %
depending on Vdiag
15 % if thermal
protection activated.
DAETRW_V04_CCONF/DAETRW_V08_CCONF/DAETRW_V06_CCONF/DAETRW_V0C_CCONF
MR-366-X84-36B000$528_eng.mif

POWER ASSISTED STEERING
Fault finding - Conformity check
36B
36B - 27V6 MR-366-X84-36B000$528_eng.mif
PAS
Vdiag No.: 04, 06, 08, 0C
and 12
SUB-FUNCTION: ASSISTANCE
NOTESOnly check conformity after a complete check using the diagnostic tool. The values
shown in this conformity check are given as examples.
Execution conditions: ENGINE STOPPED, IGNITION ON.
Order FunctionParameter or Status
checked or ActionDisplay and Notes Fault finding
1Steering
wheel
angleET020:Steering wheel
angle sensor
programmingStatus 4: calibrated
and initialisedIn the event of a fault, refer to
the interpretation of status
ET020.
PR121:Steering wheel
angle0˚ with the wheels set
straight ahead
+ or - 580˚ at full lockIn the event of a fault, consult
the interpretation of PR121.
2Vehicle
speedPR003:Vehicle speed0 mph (km/h) when
stationaryIn the event of a fault, test the
multiplex network.
3TorquePR001:Torque applied to
the steering wheel0 Nm ± 0.2 Nm
with no action on the
steering wheelIn the event of a fault, consult
the interpretation of PR001.
PR006:Steering motor
torque setpoint0 Nm ± 0.2 NmIn the event of a fault, consult
the interpretation of PR006.
4Motor
powerPR012:Current absorbed
by the motor0 A < X < 1 AIn the event of a fault, consult
the interpretation of PR012.
PR013:Setpoint for
current absorbed
by the motor0 A < X < 1 AIn the event of a fault, consult
the interpretation of PR013.
5Thermal
protectionPR119:Motor thermal
protection
indicatorInterior temperature
± 5˚CIf PR119 > 60 ˚C, thermal
protection is activated.
The level of assistance
PR014 = 15 %.
To deactivate the thermal
protection, do not operate the
EPAS for 15 minutes. PR014:Level of
assistance
available0 % or 99 %
depending on Vdiag
15 % if thermal
protection activated.

POWER ASSISTED STEERING
Fault finding - Conformity check
36B
36B - 29V6 MR-366-X84-36B000$528_eng.mif
PAS
Vdiag No.: 04, 06, 08, 0C
and 12
MAIN SCREEN
NOTESOnly carry out this conformity check after a complete check with the diagnostic tool.
The values shown in this conformity check are given as examples.
Test condition: ENGINE AT IDLE SPEED.
Order FunctionParameter or Status
checked or ActionDisplay and Notes Fault finding
1Steering wheel
angleET020:Steering wheel
angle sensor
programmingStatus 4: calibrated
and initialisedIn the event of a fault, consult
the interpretation of status
ET020.
2EngineET023:Engine
operationRUNNINGIn the event of a fault, test the
multiplex network.
3Computer
supplyPR108:Computer feed
voltage12 V < X < 16 VIf the computer supply
voltage is not sufficient,
dialogue cannot be
established.
If PR108 is not correct, run
fault finding on the charge
circuit.
4Vehicle speedPR003:Vehicle speed0 mph (0 km/h) when
stationaryIn the event of a fault, test the
multiplex network.
5Electric motorPR012:Current
absorbed by the
motor- 90 < X < 90A ± 5ANone
6Thermal
protectionPR119:Motor thermal
protection
indicatorInterior temperature
± 5 ˚CIf PR119 > 60 ˚C, thermal
protection is activated.
The assistance level PR140
= 15 %.
To deactivate thermal
protection, switch off the
engine and do not operate
the EPAS for 15 minutes. PR014:Level of
assistance
available100 % idling
15 % if thermal
protection activated.

POWER ASSISTED STEERING
Fault finding - Conformity check
36B
36B - 31V6 MR-366-X84-36B000$528_eng.mif
PAS
Vdiag No.: 04, 06, 08, 0C
and 12
SUB-FUNCTION: ASSISTANCE
NOTESOnly check conformity after a complete check using the diagnostic tool. The values
shown in this conformity check are given as examples.
Test condition: ENGINE AT IDLE SPEED.
Order FunctionParameter or Status
checked or ActionDisplay and Notes Fault finding
1Steering
wheel
angleET020:Steering wheel
angle sensor
programmingStatus 4: calibrated
and initialisedIn the event of a fault, refer to
the interpretation of status
ET020.
PR121:Steering wheel
angle0˚ with the wheels set
straight ahead
+ or - 570˚ ± 20˚ at full
lockIn the event of a fault, consult
the interpretation of PR121.
2Vehicle
speedPR003:Vehicle speed0 mph (km/h) when
stationaryIn the event of a fault, test the
multiplex network.
3TorquePR001:Torque applied to
the steering wheel- 11 Nm < X
< + 11 Nm
with action on the
steering wheelIn the event of a fault, consult
the interpretation of PR001.
PR006:Steering motor
torque setpoint0 Nm ± 0.2 NmIn the event of a fault, consult
the interpretation of PR006.
4Motor
powerPR012:Current absorbed
by the motor- 90 < X < 90A ± 5AIn the event of a fault, consult
the interpretation of PR012.
PR013:Setpoint for
current absorbed
by the motor- 90 < X < 90A ± 5ANone
5Thermal
protectionPR119:Motor thermal
protection
indicatorInterior temperature
± 5 ˚CIf PR119 > 60 ˚C, thermal
protection is activated.
The assistance level PR140
= 15 %.
To deactivate thermal
protection, switch off the
engine and do not operate the
EPAS for 15 minutes. PR014:Level of
assistance
available100 % idle speed
15 % if thermal
protection activated.

POWER ASSISTED STEERING
36B
36B - 38V6 MR-366-X84-36B000$726_eng.mif
PAS
Vdiag No.: 04, 06, 08, 0C
and 12POWER ASSISTED STEERING
Fault finding - Parameter summary table
Tool parameter Diagnostic tool title
PR001Torque applied to the steering wheel
PR003Vehicle speed
PR006Steering motor torque setpoint
PR012Current absorbed by the motor
PR013Setpoint for current absorbed by the motor
PR014Level of assistance available
PR108Computer feed voltage
PR119Motor thermal protection indicator
PR121Steering wheel angle
MR-366-X84-36B000$726_eng.mif

POWER ASSISTED STEERING
Fault finding - Parameter interpretation
36B
36B - 39V6 MR-366-X84-36B000$792_eng.mif
PAS
Vdiag No.: 04, 06, 08, 0C
and 12POWER ASSISTED STEERING
Fault finding - Parameter interpretation
PR003
VEHICLE SPEED
NOTESThis signal is sent by the ABS computer to the multiplex network.
The vehicle speed signal can adapt the steering assistance to the vehicle speed.
PR003 must be equal to the actual vehicle speed, within 6 mph (10 km/h).
If the parameter does not match the actual vehicle speed:
–run fault finding on the multiplex network using the diagnostic tool,
–consult the interpretation of faults DF033 Multiplex network and DF057 Vehicle speed multiplex signal.
If the fault is still present, contact the Techline.
Note:
If the vehicle speed multiplex signal is absent or invalid, the value displayed on the tool is 0 or a fixed value
(depending on the configuration).
AFTER REPAIRCarry out a road test, followed by a check with the diagnostic tool.
DAETRW_V04_PR003/DAETRW_V08_PR003/DAETRW_V06_PR003/DAETRW_V0C_PR003 /
DAETRW_V12_PR003
MR-366-X84-36B000$792_eng.mif

POWER ASSISTED STEERING
Fault finding - Parameter interpretation
36B
36B - 40V6 MR-366-X84-36B000$792_eng.mif
PAS
Vdiag No.: 04, 06, 08, 0C
and 12
PR012
CURRENT ABSORBED BY THE MOTOR
NOTESNone
Parameter PR013 indicates the stipulated current setpoint for the steering motor.
This current depends:
–on the vehicle speed,
–on the torque applied to the steering wheel.
Parameter PR012 indicates the current actually consumed by the steering motor.
The value of parameter PR013 Setpoint for current absorbed by motor should be almost equal to the value of
parameter PR012 Current absorbed by motor.
If the parameters do not match the values indicated in the Conformity check, consult the interpretation of fault
DF035 Variable power assisted steering motor.
AFTER REPAIRCarry out a road test, followed by a check with the diagnostic tool.
DAETRW_V04_PR012/DAETRW_V08_PR012/DAETRW_V06_PR012/DAETRW_V0C_PR012 /
DAETRW_V12_PR012