C1514

POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: C1511-C1514, C1517: Torque Sensor Circuit Malfunction


DESCRIPTION

The torque sensor converts the rotation torque input from the steering wheel into electric signals and sends them to the power steering ECU.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
If the steering column assembly or power steering ECU has been replaced, perform the rotation angle sensor value initialization and torque sensor zero point calibration Programming and Relearning.

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.

NG -- CONNECT CONNECTOR
OK -- Continue to next step.

2. READ VALUE USING TECHSTREAM (TORQUE SENSOR 1, TORQUE SENSOR 2)

(a) Turn the power switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the power switch on (READY).

(d) Turn the Techstream on.

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

(f) Select the items "Torque Sensor 1 Output" and "Torque Sensor 2 Output" in the Data List and read the value displayed on the Techstream.

EMPS





OK:

Normal condition value is displayed on the Techstream during each steering operation.

NG -- CHECK POWER STEERING ECU (TRQV VOLTAGE)

OK -- REPLACE POWER STEERING ECU Removal

3. CHECK POWER STEERING ECU (TRQV VOLTAGE)

(a) Turn the power switch on (READY).





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

Standard Voltage:





Text in Illustration





NG -- REPLACE POWER STEERING ECU Removal
OK -- Continue to next step.

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

(a) Turn the power switch on (READY).





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

Standard Voltage:





Text in Illustration





Result





C -- REPLACE STEERING COLUMN ASSEMBLY Removal

B -- REPLACE STEERING COLUMN ASSEMBLY Removal

A -- REPLACE POWER STEERING ECU Removal