NO.1 POWER ASSIST DIFFERS BETWEEN RIGHT AND LEFT TURNS [ELECTRIC POWER STEERING (EPS)]

id0603a2811400

1
Power assist differs between right and left turns.
TROUBLESHOOTING HINTS
•  Steering gear and linkage malfunction.
•  EPS control module malfunction.
•  Poor connection of EPS control module connector, terminal damage.
•  The steering wheel angle neutral position learning function has not been operated.
Note
•  The steering angle learned by the EPS control module is cleared when 5 min. or more has elapsed after the battery negative terminal was disconnected.

Diagnostic procedure

STEP

INSPECTION

ACTION
1
•  Have DTCs been recorded in the memory?
Yes
Perform inspection using the appropriate DTC.
(See DTC TABLE [EPS CONTROL MODULE].)
No
Go to the next step.
2
•  Switch the ignition to off and maintain this condition 2 min. or more.
•  Switch the ignition ON (engine on).
•  Drive for 25 sec. or more in a straight line at more than 35 km/h {22 mph}.
•  Is there recurrence of malfunction?
Yes
Go to the next step.
No
Temporary error occurred while learning steering wheel angle neutral position.
There is not malfunction in the EPS system.
3
•  Inspect the connection of the EPS control module connector.
•  Disconnect the EPS control module connector.
•  Inspect both the EPS control module and wiring harness-side connector for poor connection (such as damage/pulled-out pins, corrosion).
•  Are all the pins normal?
Yes
Perform wheel alignment inspection.
(See WHEEL ALIGNMENT PRE-INSPECTION.)
(See FRONT WHEEL ALIGNMENT.)
(See REAR WHEEL ALIGNMENT.)
No
If poor connection of EPS control module connector:
•  Securely connect the EPS control module connector.
If the EPS control module side connector is wrong:
•  Replace the EPS control module.
If the wiring harness-side connector is wrong:
•  Repair or replace the pins and/or the connector.
•  Recheck malfunction symptoms, then replace the steering gear and linkage.