VARIABLE GEAR RATIO STEERING SYSTEM, Diagnostic DTC:C15C6/77

DTC Code DTC Name
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.

DTC Code DTC Detection Condition Trouble Area
C15C6/77 The steering control ECU detects that the battery voltage is normal and the IG terminal voltage is below 4 V for 6 seconds.

  • Harness or connector

  • Steering control ECU

WIRING DIAGRAM

A0158B6E04

INSPECTION PROCEDURE

Tech Tips

The fault may be intermittent. Check the harnesses and connectors thoroughly and retest.

PROCEDURE


  1. CHECK STEERING CONTROL ECU (POWER SOURCE CIRCUIT)


    1. Record and clear the DTCs Click here.

    2. A0159IQE12

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E77-7 (PGND) - Body ground Always Below 1 Ω
      E78-8 (PGD2) - Body ground
      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      E77-3 (IG) - Body ground Engine switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. RECONFIRM DTC OUTPUT


    1. Check for DTCs Click here.

      Result
      Result Proceed to
      C15C6/77 is not output A
      C15C6/77 is output (for LHD) B
      C15C6/77 is output (for RHD) C

    B

    REPLACE STEERING CONTROL ECU Click here

    C

    REPLACE STEERING CONTROL ECU Click here

    A

    USE SIMULATION METHOD TO CHECK Click here