C1524

POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: C1522-C1555: Motor Circuit Malfunction
C1555 - Motor Relay Welding Failure

DESCRIPTION

The power steering ECU supplies current to the power steering motor through the motor circuit.





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 (POWER STEERING MOTOR - POWER
STEERING ECU)

(a) Check the connection condition of the z19 power steering motor connector.





OK:

Power steering motor connector is securely connected and locked to the power steering ECU.

Text in Illustration





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

2. READ VALUE USING TECHSTREAM (MOTOR VOLTAGE)

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Turn the Techstream on.

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

(f) Select the items "Motor Terminal Volt(U)", "Motor Terminal Volt(V)" and "Motor Terminal Volt(W)" in the Data List and read the value displayed on the Techstream.

EMPS





Result:





B -- REPLACE STEERING COLUMN ASSEMBLY Removal
A -- Continue to next step.

3. REPLACE POWER STEERING ECU ASSEMBLY

(a) Replace the power steering ECU assembly Removal.

NEXT -- Continue to next step.

4. INITIALIZE ROTATION ANGLE SENSOR AND CALIBRATE TORQUE SENSOR ZERO POINT

(a) Initialize the rotation angle sensor value and calibrate the torque sensor zero point Programming and Relearning.

NEXT -- Continue to next step.

5. CHECK FOR DTC

(a) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

OK:

DTCs C1522, C1523, C1524 and C1555 are not output.

NG -- REPLACE STEERING COLUMN ASSEMBLY Removal

OK -- END