C1551

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

NOTICE:
* If the steering column assembly or power steering ECU has been replaced, perform the rotation angle sensor initialization and torque sensor zero point calibration Programming and Relearning.
* Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1. READ VALUE USING TECHSTREAM (IG POWER SUPPLY)

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / EMPS / Data List.

(f) 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 -- CHECK HARNESS AND CONNECTOR (IG1 RELAY - POWER STEERING ECU)

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

2. CHECK HARNESS AND CONNECTOR (IG1 RELAY - POWER STEERING ECU)

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





(b) Turn the ignition switch to ON.

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

Standard Voltage:





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

Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE POWER STEERING ECU Removal