POWER-ASSISTED STEERING
Fault finding – Replacement of components
36B
36B-10V5 MR-372-J84-36B000$264_fra.mif
EPAS
Vdiag no.: 05, 09,
0DPOWER-ASSISTED STEERING
Fault finding – Replacement of components
Precautions for use
–The computer, electric motor, upper steering column and angle sensor unit (EPAS) cannot be separated.
A. Replacing the EPAS (computer - upper column assembly):
Before replacing the EPAS, run fault finding on the system: apply the appropriate fault finding procedure.
The EPAS may be replaced only with the consent of the Techline.
When replacing the electric power assisted steering, carry out the following operations in order:
–disconnect the vehicle battery,
–replace the EPAS (see Workshop Repair Manual 370 Mechanics, 36B, Electric power assisted steering),
–reconnect the vehicle battery,
–connect the diagnostic tool, switch on the ignition and establish dialogue with the PAS computer, write the vehicle
VIN by running command VP001,
–configure (see Configuration and programming),
–program the steering wheel angle sensor (only for Vdiag 05 and 09) (see Configuration and programming),
–write the most recent After-Sales operation date by running command VP005,
–switch off the ignition for at least 15 seconds for the configurations to register, without disconnecting the battery,
–switch on the ignition and establish dialogue with the electric power-assisted steering computer,
–turn the steering wheel to full right lock and then to full left lock,
–check that there are no faults and that the variables are correct (notably parameter PR121 Steering wheel angle
for the Vdiag 05 and 09),
–check that the EPAS is working correctly (steering assistance available when the engine is running).
B. Replacing the steering rack (without changing the EPAS):
–disconnect the vehicle battery,
–replace the steering rack (see MR 370 Mechanics, 36B, EPAS),
–reconnect the vehicle battery,
–connect the diagnostic tool, switch on the ignition and establish dialogue with the electric power-assisted steering
computer (EPAS computer),
–program the steering wheel angle sensor (only for Vdiag 05 and 09) (see Configuration and programming),
–turn the steering wheel to full right lock and then to full left lock,
–makesure there a re n o faults a nd check the conformity o f paramete rPR121 Steering wheel angle (Vdiag 05 and 0 9),
–check that the EPAS is working correctly (steering assistance available when the engine is running).
* APV: After-SalesWARNING
You must never leave the ignition switched on or the engine running during a mechanical operation on the electric
power assisted steering or the front axle. To avoid any accident, the battery must be disconnected (to prevent
the danger of accidental triggering of the EPAS motor).
MR-372-J84-36B000$264_fra.mif
POWER-ASSISTED STEERING
36B
36B-11V5 MR-372-J84-36B000$330_fra.mif
EPAS
Vdiag no.: 05, 09,
0DPOWER-ASSISTED STEERING
Fault finding – Configurations and programming
Summary table of configurations and configuration readings
GENERAL INSTRUCTIONS:
After replacing the EPAS computer/steering column unit, configure the computer's assistance strategy and program
the steering wheel angle sensor (only for Vdiag 05 and 09).
The following procedure must be followed in order to carry out the above configuration and programming:
–connect the diagnostic tool,
–switch on the ignition and establish dialogue with the electric power-assisted steering computer,
–select the "Repair mode" menu,
–configure the computer's assistance strategy and program the steering wheel angle sensor (see below),
–exit fault finding mode: stop dialogue with the electric power assisted steering computer without switching off the
CLIP tool,
–switch off the ignition for at least 15 seconds, without disconnecting the battery, for the configuration to be taken
into account by the EPAS computer,
–switch on the ignition again and establish dialogue with the electric power assisted steering computer,
–make sure the configuration readings have been properly registered,
–check that the system is operating correctly (steering assistance available when the engine is running).
A. STEERING WHEEL ANGLE SENSOR PROGRAMMING (only for Vdiag 05 and 09)
PROCEDURE COMPLETE:
(following replacement of the computer/steering column assembly).
Status ET020 Steering wheel angle sensor programming is STATUS 1 (SERVICE indicator light is continuously
lit, see interpretation of status).
–with the ignition on, connect the diagnostic tool and establish dialogue with the electric power assisted steering
computer,
–with the engine stopped or running (to obtain maximum steering assistance), turn the steering wheel to full left lock
and then to full right lock,
–set the vehicle wheels straight ahead, with the steering at the centre point (driving in a straight line),
–run command VP004 Steering wheel angle sensor programming by pressing the CONFIRM button,
–turn the steering wheel to full left lock and then to full right lock,
–Status ET020 Steering wheel angle sensor programming must be STATUS 4 (normal operational status),
–check that parameter PR121 Steering wheel angle varies within the limits indicated in the Conformity check
section and that DF038 Angle sensor is not present. VP001 Enter VIN ID010 VIN code
VP004Steering wheel angle sensor programming
(only for Vdiag 05 and 09)ET020Steering wheel angle sensor programming
(only for Vdiag 05 and 09)
VP005 Enter the APV* operation date ID018 Read last APV* operation date
SC001 Computer calibration ET026 Computer calibration
Note:
To obtain a precise wheels straight ahead position (straight line driving), carry out this operation on a front axle
adjustment bench (especially for vehicles fitted with ESP).
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 the computer version) clear the ESP sensor programming using command RZ003.
Make sure there are no ESP faults: carry out the necessary operations by referring to the Fault Finding Manual.
MR-372-J84-36B000$330_fra.mif
