ELECTRONIC POWER STEERING SYSTEM FAIL-SAFE CHART
When a problem occurs in the electric 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.
| DTC No. | Malfunction | Fail-safe |
|---|---|---|
| C1511/11 C1512/12 C1513/13 C1514/14 |
Torque sensor malfunction | Assist force restricted |
| C1517/17 | Torque sensor malfunction | Power assist stops |
| C1524/24 | Motor malfunction | Power assist stops |
| C1531/31 C1532/32 |
Power steering ECU malfunction | Power assist stops |
| C1533/33 | Temperature sensor malfunction in power steering ECU | Assist force restricted |
| C1541/41 C1542/42 |
Speed sensor malfunction | Assist force restricted |
| C1544/44 C1545/45 |
Engine revolution signal malfunction | Assist force restricted |
| C1551/51 | IG power source voltage error | Power assist stops |
| C1552/52 | PIG power source voltage error | Power assist stops |
| C1554/54 | Power source relay malfunction | Power assist stops |
| C1555/55 | Motor relay malfunction | Power assist stops |
| - | 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
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.