NO.3 POWER ASSIST DIFFERS BETWEEN RIGHT AND LEFT TURNS [ELECTRIC POWER STEERING (EPS)]

id0603a2801000

3

Power assist differs between right and left turns.

TROUBLESHOOTING HINTS

•  Steering gear and linkage malfunction.

•  EPS CM malfunction.

•  Poor connection of EPS CM connector, terminal damage.

•  The steering wheel angle neutral position automatic learning function has not been operated.

Note

•  If the right and left wheels are rotated freely at the same speed with the vehicle jacked up, the EPS CM may learn the steering angle incorrectly.

•  The steering angle learned by the EPS CM is cleared when 1 min. or more has elapsed after the ignition was switched off.

Diagnostic procedure

STEP	INSPECTION		ACTION
1	• Have DTCs been recorded in the memory?	Yes	Perform inspection using the appropriate DTC.
1	• Have DTCs been recorded in the memory?	No	Go to the next step.
2	• Switch the ignition to off and maintain this condition 1 min. or more. • Switch the ignition ON (engine on). • Drive 10 m {33 ft} or above in a straight line at more than 10 km/h {6.2 mph}. • Is there recurrence of malfunction?	Yes	Go to the next step.
2		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 CM connector. • Disconnect the EPS CM connector. • Inspect both the EPS CM and wiring harness-side connector for poor connection (such as damage/pulled-out pins, corrosion). • Are all the pins normal?	Yes	Replace the steering gear and linkage. (See STEERING GEAR AND LINKAGE REMOVAL/INSTALLATION.)
3		No	If poor connection of EPS CM connector: • Securely connect the EPS CM connector. If the EPS CM side connector is wrong: • Replace the EPS CM. (See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION.) 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. (See STEERING GEAR AND LINKAGE REMOVAL/INSTALLATION.)