DTC C1538 Detection of the steering neutral position deviation
caution
If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C, CAN Bus Diagnostics Table ).
Whenever ECU is replaced, ensure that the CAN bus lines are normal.
OPERATION
EPS-ECU receives steering angle information from the steering wheel sensor.
FUNCTION
Based on the steering angle information the EPS-ECU receives when the ignition switch is in the ON position, the EPS-ECU learns the neutral position of the steering wheel and performs the control to improve the steering wheel return.
TROUBLE JUDGMENT
Check Conditions
The power supply circuit system DTC (No. C1540, C1541) is not set.
Judgment Criterion
When the deviation of the neutral position of steering wheel is detected during driving straight ahead at 30km/h.
Fail Safe, Back Up Function
The EPS-ECU sets DTC No. C1538.
Aggravated feeling of steerage
TROUBLESHOOTING HINTS
Malfunction of the steering wheel sensor
Malfunction of the EPS-ECU
DIAGNOSIS
1. Check the service data "Item No. 22: Steering wheel angle" and If there is an abnormality, perform troubleshooting for steering wheel sensor (Refer to GROUP 35C - Troubleshooting ).
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