Toyota Venza: Motor Circuit Malfunction (C1521,C1531-C1534,C1554)

Toyota Venza Service Manual / Power Assist Systems / Power Steering System / Motor Circuit Malfunction (C1521,C1531-C1534,C1554)

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 stored.

DTC No.	DTC Detection Condition	Trouble Area
C1521	Motor overcurrent	Power steering ECU
C1531	ECU internal malfunction (CPU malfunction)	Power steering ECU
C1532	ECU internal malfunction (Peripheral circuit malfunction)	Power steering ECU
C1533	ECU internal malfunction (Substrate temperature sensor malfunction)	Power steering ECU
C1534	ECU internal malfunction (EEPROM error)	Power steering ECU
C1554	Power source relay circuit malfunction	Power steering ECU

CAUTION / NOTICE / HINT

NOTICE:

If the power steering ECU has been replaced with a new one, perform the rotation angle sensor initialization and torque sensor zero point calibration (See page ).

PROCEDURE

1.	CHECK FOR DTC

(a) Clear the DTCs (See page ).

(b) Check for DTCs (See page ).

OK:

DTC is not output.

CHECK INTERMITTENT PROBLEMS

REPLACE POWER STEERING ECU

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DESCRIPTION The torque sensor converts the rotation torque input to the steering wheel into an electrical signal and sends it to the power steering ECU. Based on this signal, the ECU detects stee ...

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