DYNAMIC TORQUE CONTROL AWD SYSTEM, Diagnostic DTC:C120C/79

DTC Code DTC Name
C120C/79 Linear Solenoid Power Supply System Malfunction

DESCRIPTION

This DTC is output by the 4WD ECU assembly if a malfunction occurs in the linear solenoid power supply system.

DTC No. Detection Item DTC Detection Condition Trouble Area
C120C/79 Linear Solenoid Power Supply System Malfunction

  1. When the 4WD relay is on, the 4WD relay monitor remains off for 1 second or more while the voltage at the IG1 terminal is 9.5 V or more

  2. When the 4WD relay is on, the 4WD relay monitor remains off for 1 second or more while the voltage at the IG1 terminal is less than 9.5 V

  3. While the 4WD relay is off, the 4WD relay monitor remains on for 1 second or more immediately after the ignition switch is turned to ON

  • Wire harness and connector (IG1 circuit, GND circuit)

  • 4WD ECU assembly
DTC Detection Conditions:
Vehicle Condition
Pattern 1 Pattern 2 Pattern 3
Diagnosis Condition - - - -
Malfunction Status When the 4WD relay is on, the 4WD relay monitor remains off for 1 second or more while the voltage at the IG1 terminal is 9.5 V or more ○ - -
When the 4WD relay is on, the 4WD relay monitor remains off for 1 second or more while the voltage at the IG1 terminal is less than 9.5 V - ○ -
While the 4WD relay is off, the 4WD relay monitor remains on for 1 second or more immediately after the ignition switch is turned to ON - - ○
Detection Time - - -
Number of Trips 1 trip 1 trip 1 trip

WIRING DIAGRAM

A001VQ9E01
*a ECU-IG1 NO. 2
*b 4WD ECU Assembly

CAUTION / NOTICE / HINT

Tech Tips

Check the condition of each related circuit connector before troubleshooting.

Click here

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (IG1 TERMINAL)


    1. A001XB2C59
      *a

      Front view of wire harness connector

      (to 4WD ECU Assembly)

      Disconnect the 4WD ECU assembly connector.

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      M77-3 (IG1) -Body ground Ignition switch ON 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (GND TERMINAL)


    1. Turn the ignition switch off.

    2. A001XB2C60
      *a

      Front view of wire harness connector

      (to 4WD ECU Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      M77-4 (GND) -Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. RECONFIRM DTC


    1. Clear the DTC.

      Click here


      Chassis > Four Wheel Drive > Clear DTCs

    2. Turn the ignition switch to ON.

    3. Check that no DTCs other than DTC C120C/79 have been output.

      Click here


      Chassis > Four Wheel Drive > Trouble Codes
      Result
      Result Proceed to
      DTCs other than C120C/79 are not output A
      DTCs other than C120C/79 are output B

    A

    REPLACE 4WD ECU ASSEMBLY Click here

    B

    REPAIR CIRCUIT INDICATED BY OUTPUT CODE Click here