C1512

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

DESCRIPTION

The torque sensor converts the rotational 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 rotation angle sensor initialization and torque sensor zero point calibration Programming and Relearning.

PROCEDURE

1. CHECK CONNECTOR CONNECTION CONDITION (TORQUE SENSOR - ECU)

(a) Check the connection condition of the z17 torque sensor connector.





OK:

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

Text in Illustration





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

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:





HINT
When the value is within the specified range, record the value.

Text in Illustration





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

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

(a) Turn the ignition switch to ON.





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

Standard Voltage:





(c) Calculate the difference between the value recorded when measuring the voltage at terminal TRQV in the previous step, and the sum of the output of torque sensor 1 and torque sensor 2.

OK:

0.3 V or less (Absolute value)

Text in Illustration





NG -- REPLACE STEERING COLUMN ASSEMBLY Removal

OK -- REPLACE POWER STEERING ECU ASSEMBLY Removal