POWER STEERING SYSTEM FAIL-SAFE CHART

If a problem occurs in the power steering system, the EPS warning light comes on in the combination meter and the power steering assist is stopped, locked at a particular point, or decreased simultaneously to protect the system.

Power Steering System
DTC Code Detection Condition Fail-safe Operation
C1511 Torque sensor malfunction Power assist stops.
C1512
C1513
C1514
C1521 Motor circuit malfunction
C1524
C1528 Motor rotation angle sensor malfunction
C1531 ECU malfunction
C1532
C1533 Power assist continues as normal.
C1534 Assist force is restricted.
C1541 Skid control malfunction The amount of power assist is locked at the 140 km/h (87 mph) level of power assist.
C1551 IG power supply voltage error Power assist continues as normal.
C1552 PIG power supply voltage error
C1554 Power supply relay malfunction Power assist stops.
C1555 Motor relay malfunction
C1581 Assist map not written in power steering ECU Control is performed using the default settings.
C1582 Assist map mismatch in power steering ECU Control is performed using the current assist map.
U0100 ECM communication error Power assist continues as normal*1.
Power assist stops*2.
U0129 Skid control ECU communication error The amount of power assist is locked at the 140 km/h (87 mph) level of power assist.

Tech Tips


  • *1: When the DTC is stored while the engine is running.

  • *2: When the DTC is stored 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 is reduced and the EPS warning light comes on. In such cases, the amount of power assist returns normal when the battery voltage recovers.