C1551

POWER STEERING: POWER STEERING SYSTEM: C1551/51: IG Power Supply Voltage Malfunction
C1551/51 - IG Power Supply Voltage Malfunction

DESCRIPTION

The power steering ECU distinguishes the ignition switch status as ON or OFF through the IG power source circuit.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM (IG POWER SUPPLY)

(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 "IG 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.

NG -- INSPECT FUSE (ECU-IG)

OK -- CHECK FOR INTERMITTENT PROBLEMS How to Proceed With Troubleshooting

2. INSPECT FUSE (ECU-IG)

(a) Remove the ECU-IG fuse from the main body ECU.





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

Standard resistance:





NG -- CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (POWER STEERING ECU - BODY GROUND)

(a) Disconnect the connectors from the power steering ECU.





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

Standard voltage:





(c) Measure the resistance according to the value(s) in the table below.

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE POWER STEERING ECU Removal