Variable Gear Ratio Steering System

VARIABLE GEAR RATIO STEERING: VARIABLE GEAR RATIO STEERING SYSTEM: C15C6/77: IG Power Supply Voltage Malfunction

DTC C15C6/77 - IG Power Supply Voltage Malfunction

DESCRIPTION

The steering control ECU monitors the IG power supply voltage.
If the steering control ECU detects a malfunction, it will turn on the master warning light, store DTC C15C6/77, and stop VGRS operation.






WIRING DIAGRAM





INSPECTION PROCEDURE
HINT:
The fault may be intermittent. Check the harnesses and connectors thoroughly and retest.

PROCEDURE

1. CHECK STEERING CONTROL ECU (POWER SOURCE CIRCUIT)
(a) Record and clear the DTCs Reading and Clearing Diagnostic Trouble Codes.





(b) Measure the resistance and voltage according to the value(s) in the table below.
Standard Resistance:






Standard Voltage:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
2. RECONFIRM DTC OUTPUT
(a) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

Result





B -- REPLACE STEERING CONTROL ECU
A -- USE SIMULATION METHOD TO CHECK