C1512

POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for Hatchback): C1511-C1514, C1517: Torque Sensor Circuit Malfunction
C1517 - Torque Hold Abnormal

DESCRIPTION

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





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
If the power steering ECU assembly or steering column assembly has been replaced, perform the torque sensor zero point calibration and assist map writing 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 assembly.

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

2. INSPECT POWER STEERING ECU ASSEMBLY (TORQUE SENSOR OUTPUT)





(a) Start the engine.

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

Standard Voltage:





Text in Illustration





NG -- REPLACE POWER STEERING ECU ASSEMBLY Removal (from 07/2011)
OK -- Continue to next step.

3. INSPECT POWER STEERING ECU ASSEMBLY (TRQ1, TRQ2 VOLTAGE)





(a) Start the engine.

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

Standard Voltage:





Text in Illustration





(c) Calculate the difference between the measured TRQV*1 and the sum of the output values of the torque sensor 1 and torque sensor 2.

HINT
*1: TRQV was measured in the previous step.

OK:

0.3 V or less

NG -- REPLACE STEERING COLUMN ASSEMBLY Removal (from 07/2011)

OK -- REPLACE POWER STEERING ECU ASSEMBLY Removal (from 07/2011)