C1531

POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for 2AZ-FE): C1521,C1531-C1534,C1554,C1555: Motor Circuit Malfunction

DTC C1521 - Motor Circuit Malfunction

DTC C1531 - ECU Malfunction

DTC C1532 - ECU Malfunction

DTC C1533 - ECU Malfunction

DTC C1534 - ECU Malfunction

DTC C1554 - Power Supply Relay Failure

DTC C1555 - Motor Relay Welding Failure

DESCRIPTION

If the power steering ECU detects these DTCs, it will shut off the motor relay circuit (built into the power steering ECU) and stop power assist. However, power assist continues if DTC C1533 or C1534 is output.






INSPECTION PROCEDURE
NOTE: If the steering column assembly or power steering ECU has been replaced, perform the rotation angle sensor initialization and torque sensor zero point calibration Programming and Relearning.

PROCEDURE

1. CHECK FOR DTC
(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(b) Check for DTCs. Reading and Clearing Diagnostic Trouble Codes
OK:
DTC is not output.
NG -- REPLACE POWER STEERING ECU
OK -- CHECK INTERMITTENT PROBLEMS