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 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 Detection Condition Trouble Area
C15C6/77 The steering control ECU detects that the battery voltage is normal and the IG terminal voltage is less than 4 V for 6 seconds
  • P-IG1-3 fuse

  • IG circuit

  • Charging system

  • Steering control ECU

WIRING DIAGRAM

A001AS9E05
*a from P-IG1 Relay
*b Steering Control ECU

CAUTION / NOTICE / HINT

Tech Tips

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

PROCEDURE


  1. CHECK STEERING CONTROL ECU (POWER SOURCE CIRCUIT)


    1. Record and clear the DTCs Click here.

    2. Start the engine.

    3. A001CW5E03
      *1 Component with harness connected: (Steering Control ECU)

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition

      A42-3 (IG) -

      A42-7 (PGND)

      Engine switch on (IG) 9 to 16 V
      Result
      Result Proceed to
      9 to 16 V A
      Below 9 V B
      Above 16 V: 1UR-FSE Engine C
      Above 16 V: 1UR-FE Engine D

    B
    C
    D
    A
  2. CHECK DTC


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG) and turn the intelligent tester on.

    3. Check for DTCs Click here.

      Result
      Result Proceed to
      C15C6/77 is not output OK
      C15C6/77 is output NG

    OK
    NG