DTC    C1531    ECU Malfunction

DTC    C1532    ECU Malfunction

DTC    C1533    ECU Malfunction

DTC    C1534    ECU Malfunction

DTC    C1555    Motor Relay Welding Failure

for Preparation Click here


DESCRIPTION

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

DTC No.
DTC Detection Item
Trouble Area
C1531
ECU internal malfunction (CPU malfunction) is detected.
Power steering ECU assembly
C1532
ECU internal malfunction (Peripheral circuit malfunction) is detected.
Power steering ECU assembly
C1533
ECU internal malfunction (Substrate temp. sensor malfunction) is detected.
Power steering ECU assembly
C1534
ECU internal malfunction (EEPROM error) is detected.
Power steering ECU assembly
C1555
Motor relay malfunction is detected.
Power steering ECU assembly

INSPECTION PROCEDURE

1.RECONFIRM DTC

  1. Check for DTCs (Click here).

    OK:
    DTCs other than C1531, C1532, C1533, C1534 and C1555 are not output.

    NOTICE:
    If replacing the power steering ECU assembly, initialize the rotation angle sensor value and calibrate the torque sensor zero point (Click here).



NG
REPAIR CIRCUIT INDICATED BY OUTPUT CODE
OK

REPLACE POWER STEERING ECU ASSEMBLY