Inspection Procedure
WARNING: This page is about a different car, the 2007 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.
If the power steering ECU detects these DTCs, it will shut off the motor relay circuit (built into the power steering ECU) and stop power assist. However, power assist continues if DTC C1533 is output.
DTC DETECTION CONDITION AND TROUBLE AREA
| DTC No. | DTC Detection Conditions | Trouble Areas |
|---|---|---|
| C1531/25 | ECU internal malfunction (CPU malfunction) | Power steering ECU |
| C1532/25 | ECU internal malfunction (Peripheral circuit malfunction) | Power steering ECU |
| C1533/25 | ECU internal malfunction (Substrate temperature sensor malfunction) | Power steering ECU |
| C1534/25 | ECU internal malfunction (EEPROM error) | Power steering ECU |
- RECONFIRM DTC
- Check for DTC.
OK :
DTC is not output.
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
NG: GO TO NEXT STEP.
REPLACE POWER STEERING ECU
- Check for DTC.