POWER STEERING SYSTEM 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.
| 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 |
| C1546 | Hybrid control system malfunction | Assist force restricted |
| C1551 | IG power source voltage error | Power assist stops |
| C1552 | PIG power source voltage error | |
| C1555 | Motor relay malfunction | |
| C1562 | Power supply from HV battery malfunction | Assist force restricted |
| C1564 | Lost communication with power steering converter | |
| C1565 | Lost communication with power steering converter | Power assist control continues normally (P/S warning light remains on). |
| C1566 | PSOK signal malfunction | Continuous: Malfunction is detected during power assistance. Stops: Malfunction is detected immediately after power switch is turned on (READY). |
| C1568 | Power steering converter Malfunction | Power assist stops |
| C1569 | Battery power supply voltage error | If a +B power supply voltage short occurs, power assist stops. |
| If +B power supply voltage drops, power assist force is restricted and control continues. | ||
| 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 |
| U0129 | Skid control ECU communication error | Amount of power assist is locked at 100 km/h (62 mph) level of power assist |
Tech Tips
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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 power switch on (READY).
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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 auxiliary battery voltage recovers.