Dtc C1531 Ecu Malfunction

Steering. Yaris. Ncp93, 131
Power Assist Systems. Yaris. Ncp93, 131

DESCRIPTION

INSPECTION PROCEDURE

CONFIRM DTC

DTC C1531 ECU Malfunction

DTC C1532 ECU Malfunction

DTC C1533 ECU Malfunction

DTC C1534 ECU Malfunction

DTC C1535 ECU Malfunction


DESCRIPTION

The fail-safe function operates to stop power assist when DTCs indicating ECU malfunctions are stored. However, the power assist operation continues when DTC C1533 or C1534 is stored because it indicates an EEPROM error in the ECU.

DTC No.
DTC Detection Condition
Trouble Area
C1531
ECU internal malfunction (CPU malfunction)
Power steering ECU assembly
C1532
ECU internal malfunction (Peripheral circuit malfunction)
C1533
ECU internal malfunction (Substrate temperature sensor malfunction)
C1534
ECU internal malfunction (EEPROM error)
C1535
ECU internal malfunction (Steering wheel location data error)

INSPECTION PROCEDURE

NOTICE:
If the power steering ECU assembly has been replaced, perform the torque sensor zero point calibration and assist map writing (YARIS_NCP93 RM000000OSZ018X.html).
1.CONFIRM DTC

  1. Check for DTCs (YARIS_NCP93 RM000001AL601KX.html).

    Result
    Result
    		Proceed to
    DTCs other than C1531, C1532, C1533, C1534 and C1535 are output
    		A
    Other DTC are not output
    		B



B
REPLACE POWER STEERING ECU ASSEMBLY (YARIS_NCP93 RM000002XN603ZX.html)
A

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (YARIS_NCP93 RM000001AKD032X.html)