C1517

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


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.





WIRING DIAGRAM





INSPECTION PROCEDURE

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 Programming and Relearning.

PROCEDURE

1. CHECK CONNECTOR CONNECTION CONDITION

(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. CHECK POWER STEERING ECU (TRQV VOLTAGE)

(a) Turn the engine switch on (IG).





(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.

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

(a) Turn the engine switch on (IG).





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

Standard Voltage:





(c) Under each condition, measure the voltage at terminals TRQ1 and TRQ2, and calculate the sum.

Standard Voltage:





Text in Illustration





NG -- REPLACE STEERING COLUMN ASSEMBLY Removal

OK -- REPLACE POWER STEERING ECU Removal