Toyota Venza manuals

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.


OK

CHECK INTERMITTENT PROBLEMS


NG

REPLACE POWER STEERING ECU

Torque Sensor Zero Point Adjustment Incomplete (C1516,C1526)
DESCRIPTION These DTCs do not indicate a malfunction. The power steering ECU stores these DTCs when it determines that the rotation angle sensor value initialization and torque sensor zero point ...

Torque Sensor Circuit Malfunction (C1511-C1514,C1517)
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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Initialization
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PRECAUTION 1. PRECAUTION FOR DISCONNECTING THE BATTERY CABLE NOTICE: When disconnecting the cable from the negative (-) battery terminal, initialize the following systems after the terminal is reconnected. System Name See Procedure ...

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