C1531 ECU internal malfunction (CPU malfunction) is detected.

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