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. | Detection Condition | Fail-safe |
|---|---|---|
| C1511 | Torque sensor malfunction | Assist force restricted or power assist stopped |
| 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 | ||
| C1534 | ||
| C1541 | Vehicle speed signal malfunction | Assist force restricted |
| C1551 | IG power source voltage error | Power assist stopped |
| C1552 | PIG power source voltage error | |
| C1554 | Power source relay malfunction | |
| C1555 | Motor relay malfunction | |
| C1581 | Assist map not written in power steering ECU assembly | Controlled using default map |
| C1582 | Assist map mismatch written in power steering ECU assembly | Controlled using current default map |
| U0129 | Skid control ECU communication error | Assist force restricted |
| U0293 | HV ECU communication error | Power assist control normally |
| U1105 | Parking assist ECU communication error | Power assist control normally (Parking assist system does not operate) |
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 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).
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 to normal when the auxiliary battery voltage recovers.