POWER STEERING SYSTEM FAIL-SAFE CHART
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 | ||
| C1515 | Torque sensor zero point calibration has not been performed. | |
| C1516 | Torque sensor zero point calibration is incomplete due to the steering wheel being touched during calibration. | |
| C1521 | Motor overcurrent | |
| C1522 | Motor current sensor malfunction | |
| C1523 | Excessively large current deviation | |
| C1524 | Short (or open) in motor circuit or abnormal voltage or current in motor circuit | |
| C1525 | Rotation angle sensor initialization has not been performed. | |
| C1526 | Rotation angle sensor initialization is incomplete due to the steering wheel being touched during calibration. | |
| C1528 | Motor rotation angle sensor malfunction | Assist force restricted |
| C1531 | ECU internal malfunction (CPU malfunction) | Assist force restricted or power assist stopped |
| C1532 | ECU internal malfunction (peripheral circuit malfunction) | |
| C1533 | ECU internal malfunction (substrate temperature sensor malfunction) | |
| C1534 | ECU internal malfunction (EEPROM error) | |
| C1541 | Vehicle speed signals via CAN communication are cut off for 3 seconds or more. | Assist force restricted |
| C1551 | Open or short in IG power source circuit with power switch on (IG) | Assist force restricted or power assist stopped |
| C1552 | PIG power source circuit malfunction | |
| C1554 | Power source relay circuit malfunction | |
| C1555 | Motor relay circuit malfunction | Assist force restricted |
| C1567 | There is a steering angle sensor recognition error. | |
| 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 | Lost communication with skid control ECU assembly | Assist force restricted |
| U0132 | Lost communication with AVS ECU (absorber control ECU) | |
| U0293 | Lost communication with power management control ECU |
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 (IG).
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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.