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.
|DTC Code||Detection Condition||Fail-safe Operation|
|C1511||Torque sensor malfunction||Power assist stops.|
|C1521||Motor circuit malfunction|
|C1525||Motor rotation angle sensor malfunction|
|C1533||Assist force is restricted.|
|C1541||Skid control malfunction||The amount of power assist is locked at the 100 km/h (62 mph) level of power assist.|
|C1551||IG power supply voltage error||Power assist stops.|
|C1552||PIG power supply voltage error|
|C1554||Power supply relay malfunction|
|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 100 km/h (62 mph) level of power assist.|
*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.