Fail-Safe Chart
When a problem occurs in the power steering system, the EPS 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 |
Torque sensor malfunction | Power assist stopped |
| C1521 | Power steering motor circuit overcurrent malfunction | Power assist stopped |
| C1524 | Power steering motor malfunction | Power assist stopped |
| C1528 | Motor rotation angle sensor malfunction | Power assist stopped |
| C1531 | Power steering ECU malfunction | Power assist stopped (In some cases, amount of power assist remains constant at the level for speed at which malfunction was detected) |
| C1532 | Power steering ECU malfunction | Power assist stopped |
| C1533 | Temperature sensor malfunction in power steering ECU | Power assist control continues |
| C1534 | EEPROM abnormal | Assist force restricted |
| C1541 | Vehicle speed signal malfunction | Amount of power assist remains constant at the level for speed at which malfunction was detected |
| C1551 | IG power source voltage error | Power assist control continues |
| C1552 | PIG power source voltage error | Power assist control continues |
| C1554 | Power source relay malfunction | Power assist stopped |
| C1555 | Power steering motor relay malfunction | Power assist stopped |
| C1581 | Assist map not written in power steering ECU | Power assist control continues |
| C1582 | Assist map mismatch written in power steering ECU | Power assist permitted using default map |
| U0100 | ECM communication error | Amount of power assist remains constant at the level for speed at which malfunction was detected |
| U0129 | Skid control ECU communication error | Amount of power assist remains constant at the level for speed of 140 km/h (87 mph) |
| - | Extremely high temperature in ECU | Assist force restricted until normal ECU temperature recovers |
| - | Power source voltage drop | Assist force suspended until voltage recovers |
HINT:
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.