When a problem occurs in the electronic power steering system, the P/S warning light on the combination meter comes on, and the ECU stops the steering power assist, maintains the amount of power assist constant, or reduces the amount of power assist to protect the system.
| DTC No. | Malfunction | Fail-safe |
|---|---|---|
| C1511 C1512 C1513 C1514 C1516 C1517 |
Torque sensor malfunction | Power assist stopped or assist force restricted |
| C1524 | Motor malfunction | Power assist stopped or assist force restricted |
| C1531 C1532 |
Power steering ECU malfunction | Power assist stopped or assist force restricted |
| C1533 | Temperature sensor malfunction in power steering ECU | Power assist stopped or assist force restricted |
| C1534 | EEPROM abnormal | Controlled using current default map |
| C1535 | Steering wheel location data error | Power assist stopped or assist force restricted |
| C1551 | IG power source voltage error | Power assist stopped or assist force restricted |
| C1552 | PIG power source voltage error | Power assist stopped or assist force restricted |
| C1553 | Overvoltage at IG and PIG terminals | Power assist stopped or assist force restricted |
| C1554 | Power source relay malfunction | Power assist stopped or assist force restricted |
| C1555 | Motor relay malfunction | Power assist stopped or assist force restricted |
| C1581 | Assist Map Number Un-Writing | Power assist permitted using default value |
| C1582 | Assist Map Number Mismatch | Control is performed using the current assist map. |
| U0100 | ECM communication error | Assist force restricted |
| U0129 | Skid control ECU communication error | Assist force restricted |
| - | Extremely high temperature in ECU | Assist force restricted until normal ECU temperature recovers |
| - | Power source voltage drop | Assist force suspended until voltage recovers |
Tech Tips
The amount of power assist may be decreased to prevent the motor and ECUs from overheating if the steering wheel is continuously turned when the vehicle is either stopped or driven at a low speed, or if the steering wheel is kept at either full lock position for a long time. In such cases, the amount of power assist returns to normal if the steering wheel is not turned for approximately 10 minutes with the engine idling.