C1551

POWER STEERING: POWER STEERING SYSTEM: C1551/25: IG Power Supply Voltage Malfunction
C1551/25 - 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 the Techstream to the DLC3.

(b) Turn the ignition switch ON.

(c) Turn the Techstream on.

(d) Check the IG power supply. Enter the following menus: Chassis / EMPS / Data List.

EMPS





OK -- CHECK INTERMITTENT PROBLEMS
NG -- Continue to next step.

2. INSPECT FUSE (ECU-IG1)

(a) Remove the ECU-IG1 fuse from the instrument panel junction block.

(b) Measure the resistance of the fuse.

OK:

Below 1 Ohms

NG -- REPLACE FUSE
OK -- Continue to next step.

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

(a) Disconnect the E18 and A1 power steering ECU connectors.





(b) Measure the voltage of the wire harness side connectors.

Standard voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE POWER STEERING ECU