If a problem occurs in the power steering system, the power steering assist will be stopped, locked at a particular point, or decreased simultaneously to protect the system.
| DTC No. | DTC Detection Condition | Fail-safe |
|---|---|---|
| C1511 C1512 C1513 C1514 C1515 C1516 C1517 |
Torque sensor malfunction | Assist force restricted or power assist stopped |
| C1524 | Motor malfunction | |
| C1531 C1532 |
Power steering ECU assembly malfunction | |
| C1533 | Temperature sensor malfunction in power steering ECU assembly | |
| C1534 | EEPROM abnormal | |
| C1535 | Steering wheel location data error | |
| C1551 | IG power source voltage error | Power assist stopped |
| C1552 | PIG power source voltage error | |
| C1553 | Overvoltage at IG and PIG terminals | |
| C1554 | Power source relay malfunction | |
| C1555 | Motor relay malfunction | |
| C1581 | ECU malfunction (Assist map number un-writing) | |
| C1582 | Assist map mismatch written in power steering ECU assembly | Controlled using current default map |
| U0129 | Lost communication with brake booster with master cylinder assembly (skid control ECU) | Assist force restricted |
| U0293 | HV ECU communication error | Power assist stopped |
Tech Tips
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 in 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 ignition switch to ON (READY).
If the auxiliary battery is not sufficiently charged or the voltage decreases temporarily, the amount of power assist will be reduced and the EPS warning light will come on. In such cases, the amount of power assist returns normal when the auxiliary battery voltage recovers.