ELECTRONIC POWER STEERING SYSTEM > FAIL-SAFE CHART

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If a problem occurs in the electric power steering system, the P/S warning light will come on in the combination meter and steering power assistance will be stopped, fixed at a particular point, or decreased simultaneously to protect the system.

DTC No.	Malfunction	Fail-safe
C1511	Torque Sensor Circuit Malfunction	Power assistance stops.
C1512
C1513
C1521	Motor Circuit Malfunction
C1522
C1523
C1524
C1528	Motor Rotation Angle Sensor Malfunction
C1531	ECU Malfunction
C1532	ECU Malfunction
C1554	Power Supply Relay Failure
C1555	Motor Relay Welding Failure
C1533	ECU Malfunction	System overheat prevention control continues without using the substrate temperature sensor.
C1534	ECU Malfunction	Torque sensor zero point and rotation angle sensor calibration value set to the default values.
C1541	Vehicle Speed Signal Malfunction	Amount of power assistance is fixed for a speed of 100 km/h (62 mph).
U0121	Lost Communication With Anti-lock Brake System (ABS) Control Module
C1567	Lost Communication between EPS ECU and VGRS ECU	EPS cooperative control stops.
U0122	Lost Communication with Vehicle Dynamics Control Module
U0130	Lost Communication with VGRS

HINT:

The amount of power assistance 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 that case, the amount of power assistance will return to normal if the steering wheel is not turned for approximately 10 minutes with the engine idling.