C1553

POWER STEERING: ELECTRONIC POWER STEERING SYSTEM: C1552/52: PIG Power Source Circuit

DTC C1552/52 - PIG Power Source Circuit

DTC C1553/53 - When Resetting Voltage, Vehicle is Being Driven

DTC C1554/54 - EPS Relay Circuit

DTC C1555/55 - EPS Motor Relay Circuit

DESCRIPTION

When a problem occurs in the system, the power source relay circuit and the motor relay circuit are shut off to stop the power assist. The ECU must be replaced when there is a problem with the relays because each relay is built into the ECU.






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 "PIG Power Supply" in the Data List and read the value displayed on the Techstream.

EMPS:





OK:
The normal condition value is displayed on the Techstream.
OK -- CHECK INTERMITTENT PROBLEMS
NG -- Continue to next step.
2. INSPECT FUSE (EPS FUSE)
(a) Remove the EPS fuse from the engine room R/B.




(b) Measure the resistance of the fuse.
Standard resistance:
Below 1Ohms
NG -- INSPECT SHORT CIRCUIT IN COMPONENTS AND WIRES CONNECTED TO FUSE
OK -- 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 voltage and the resistance.
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