C1551

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

DTC 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
(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.
OK -- CHECK INTERMITTENT PROBLEMS
NG -- Continue to next step.
2. INSPECT FUSE (ECU-IG)




(a) Remove the ECU-IG fuse from the instrument panel J/B.
(b) Check the resistance of the fuse.
Standard resistance:
Below 1 Ohms
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 connectors from the power steering ECU.
(b) Measure the voltage and the resistance.
Standard:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE POWER STEERING ECU