Toyota Venza: Motor Circuit Malfunction (C1522-C1555)

Toyota Venza Service Manual / Power Assist Systems / Power Steering System / Motor Circuit Malfunction (C1522-C1555)

DESCRIPTION

The power steering ECU supplies current to the power steering motor through the motor circuit.

DTC No.	DTC Detection Condition	Trouble Area
C1522	Motor current sensor malfunction	Steering column assembly Power steering ECU
C1523	Excessively large current deviation
C1524	Short (or open) in motor circuit or abnormal voltage or current in motor circuit
C1555	Motor relay failure

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

If the power steering ECU and steering column assembly have been replaced, perform the rotation angle sensor initialization and torque sensor zero point calibration (See page ).

PROCEDURE

1.	READ VALUE USING TECHSTREAM (MOTOR VOLTAGE)

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / EMPS / Data List.

(f) Select the items "Motor Terminal Volt(U)", "Motor Terminal Volt(V)" and "Motor Terminal Volt(W)" in the Data List and read the value displayed on the Techstream.

EMPS

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Motor Terminal Volt(U)	Motor terminal voltage (U phase)/ Min.: 0 V Max.: 46.667 V	During steering operation, value changes within 4 to 46 V range	The engine is running and steering wheel is being turned.
Motor Terminal Volt(V)	Motor terminal voltage (V phase)/ Min.: 0 V Max.: 46.667 V	During steering operation, value changes within 4 to 46 V range	The engine is running and steering wheel is being turned.
Motor Terminal Volt(W)	Motor terminal voltage (W phase)/ Min.: 0 V Max.: 46.667 V	During steering operation, value changes within 4 to 46 V range	The engine is running and steering wheel is being turned.

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Motor Terminal Volt(U)

Motor terminal voltage (U phase)/

Min.: 0 V

Max.: 46.667 V

During steering operation, value changes within 4 to 46 V range

The engine is running and steering wheel is being turned.

Motor Terminal Volt(V)

Motor terminal voltage (V phase)/

Min.: 0 V

Max.: 46.667 V

During steering operation, value changes within 4 to 46 V range

The engine is running and steering wheel is being turned.

Motor Terminal Volt(W)

Motor terminal voltage (W phase)/

Min.: 0 V

Max.: 46.667 V

During steering operation, value changes within 4 to 46 V range

The engine is running and steering wheel is being turned.

Result	Proceed to
During steering operation, value changes within 4 to 46 V range	A
During steering operation, voltage is not generated	B

REPLACE POWER STEERING ECU

REPLACE STEERING COLUMN ASSEMBLY

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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 ...

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