Fail-Safe Chart
If a problem occurs in the power steering system, the P/S warning light will come on in the combination meter and the power steering assist will be stopped, locked at a particular point, or decreased simultaneously to protect the system.
POWER STEERING SYSTEM
| DTC No. | Detection Condition | Fail-safe |
|---|---|---|
| C1511 | Torque sensor malfunction | Power assist stops |
| C1512 | ||
| C1513 | ||
| C1514 | ||
| C1515 | ||
| C1516 | ||
| C1517 | ||
| C1521 | Motor circuit malfunction | |
| C1522 | ||
| C1523 | ||
| C1524 | ||
| C1525 | Motor rotation angle sensor malfunction | |
| C1526 | ||
| C1528 | ||
| C1531 | ECU malfunction | |
| C1532 | ||
| C1533 | Assist force restricted | |
| C1534 | ||
| C1541 | Vehicle speed signal malfunction | Amount of power assist is locked at 100 km/h (62 mph) level of power assist |
| C1551 | IG power source voltage error | Power assist stops |
| C1552 | PIG power source voltage error | |
| C1554 | Power source relay malfunction | |
| C1555 | Motor relay malfunction | |
| C1581 | Assist map not written in power steering ECU | Controlled using default map |
| C1582 | Assist map mismatch written in power steering ECU | Controlled using current default map |
| U0100 | ECM communication error | Power assist control continues normally.*1 |
| Power assist stops.*2 | ||
| U0129 | Skid control ECU communication error | Amount of power assist is locked at 100 km/h (62 mph) level of power assist |
| U1104 | Driving Support ECU communication error | Power assist control normally (Lane keeping assist system does not operate) |
HINT:
- *1: A DTC is output while the engine is running.
- *2: A DTC is output before the engine is started.
- 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.
- If the battery is not sufficiently charged or the voltage decreases temporarily, the amount of power assist will be reduced and the P/S warning light will come on. In such cases, the amount of power assist returns normal when the battery voltage recovers.