Motor Circuit Malfunction (C1521,C1531-C1534,C1554)
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 |
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 .gif)
).
PROCEDURE
CHECK FOR DTC
(a) Clear the DTCs (See page ).
(b) Check for DTCs (See page ).
OK:
DTC is not output.
| OK | .gif) | CHECK INTERMITTENT PROBLEMS |
| NG | | REPLACE POWER STEERING ECU |
Test yourself
A quick Toyota Venza quiz: every answer comes with an explanation and a link to the manual page.