Motor Circuit Malfunction - Electronic Power Steering System

POWER STEERING: ELECTRONIC POWER STEERING SYSTEM: C1524/24: Motor Circuit Malfunction

DTC C1524/24 - Motor Circuit Malfunction

DESCRIPTION

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






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM
(a) Connect a Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Chassis / EMPS / Data List.
(e) Select the item "Motor Actual Current" and "Command Value Current" in the Data List and read the value displayed on the Techstream.

Standard current:





HINT: The current changes when steering wheel is turned.

OK -- CHECK INTERMITTENT PROBLEMS
NG -- Continue to next step.
2. INSPECT POWER STEERING ECU
(a) Turn the ignition switch to ON.




(b) Measure the voltage.
Standard voltage:






OK -- INSPECT STEERING COLUMN ASSEMBLY (POWER STEERING MOTOR)
NG -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (POWER STEERING ECU - BODY GROUND)
(a) Disconnect the connector from the power steering ECU.




(b) Measure the resistance and the voltage.
Standard:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. INSPECT STEERING COLUMN ASSEMBLY (POWER STEERING MOTOR)
(a) Disconnect the connector from the power steering ECU.




(b) Measure the resistance.
Standard resistance:






NG -- REPLACE STEERING COLUMN ASSEMBLY
OK -- REPLACE POWER STEERING ECU