Fail-Safe Chart
When a problem occurs in the electronic motor power steering system, the P/S warning is indicated on the multi-display, the master warning light on the combination meter comes on, and steering power assist is stopped, fixed at a particular point, or decreased simultaneously to protect the system.
Electronic power steering system
| DTC No. | Malfunction | Fail-safe |
|---|---|---|
| C1511 C1512 C1513 C1514 C1517 |
Torque sensor malfunction | Power assist stops. |
| C1524 | Motor malfunction | Power assist stops. |
| C1531 C1532 |
Power steering ECU malfunction | Power assist stops. |
| C1533 | Temperature sensor malfunction in power steering ECU | Amount of power assist is limited. |
| C1551 | IG power source voltage error | Power assist stops. |
| C1552 | PIG power source voltage error | Power assist stops. |
| C1554 | Power source relay malfunction | Power assist stops. |
| C1555 | Motor relay malfunction | Power assist stops. |
| U0073 | CAN bus malfunction | Amount of power assist is fixed for a speed of 43 mph (70 km/h). |
| U0121 | Skid control ECU communication error | Amount of power assist is fixed for a speed of 43 mph (70 km/h). |
| - | Extremely high temperature in ECU | Amount of power assist is limited until ECU temperature goes down. |
| - | Power source voltage drop | Power assist is interrupted, but normal power assist is resumed when voltage returns. |
HINT:
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 that case, the amount of power assist returns to normal if the steering wheel is not turned for approximately 10 minutes with the engine idling.