Toyota Venza: Torque Sensor Circuit Malfunction (C1511-C1514,C1517)

Toyota Venza Service Manual / Power Assist Systems / Power Steering System / 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 steering effort.

DTC No.	DTC Detection Condition	Trouble Area
C1511	Torque sensor (TRQ1) signal error or stop	Steering column assembly (torque sensor) Power steering ECU
C1512	Torque sensor (TRQ2) signal error or stop
C1513	Deviation between torque sensors TRQ1 and TRQ2 exceeds specified value
C1514	Torque sensor power source voltage error
C1517	Temporary control due to malfunction related to torque sensor continues for long time

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.	CHECK CONNECTOR CONNECTION CONDITION (TORQUE SENSOR - ECU)

(a) Check the installation condition of the torque sensor connector.

OK:

Torque sensor connector is securely connected to the power steering ECU.

CONNECT CONNECTOR

2.	CHECK POWER STEERING ECU (TRQV VOLTAGE)

(a) Turn the ignition switch to ON.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
z10-6 (TRQV) - z10-8 (TRQG)	Ignition switch ON	4.5 to 5.5 V

Text in Illustration

*1	Component with harness connected (Power Steering ECU)

REPLACE POWER STEERING ECU

3.	CHECK POWER STEERING ECU (TRQ1, TRQ2 VOLTAGE)

(a) Start the engine.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
z10-5 (TRQ1) - z10-8 (TRQG)	The engine running, steering wheel not turned (without load).	2.3 to 2.7 V
	The engine running, steering wheel turned to right with vehicle stopped.	2.5 to 3.8 V
	The engine running, steering wheel turned to left with vehicle stopped.	1.2 to 2.5 V
z10-7 (TRQ2) - z10-8 (TRQG)	The engine running, steering wheel not turned (without load).	2.3 to 2.7 V
	The engine running, steering wheel turned to right with vehicle stopped.	1.2 to 2.5 V
	The engine running, steering wheel turned to left with vehicle stopped.	2.5 to 3.8 V

Standard Voltage:

Inspection Item	Condition	Specified Condition
Sum of voltage between z10-5 (TRQ1) and z10-8 (TRQG) and voltage between z10-7 (TRQ2) and z10-8 (TRQG)	The engine running, steering wheel not turned (without load).	Between 4.75 V and 5.25 V
	The engine running, steering wheel turned to right with vehicle stopped.
	The engine running, steering wheel turned to left with vehicle stopped.

Text in Illustration

*1	Component with harness connected (Power Steering ECU)

REPLACE POWER STEERING ECU

REPLACE STEERING COLUMN ASSEMBLY

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 DT ...

Torque Sensor Zero Point Adjustment Undone (C1515,C1525)

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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