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 operating, 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 operating, 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 not operating, the 4WD relay monitor remains on for 1 second or more after the engine switch is turned on (IG)

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

  • 4WD ECU assembly

WIRING DIAGRAM

A01RA7JE04
*a from IG1-MAIN Relay
*b ECU-IG1 NO. 5
*c 4WD ECU Assembly

CAUTION / NOTICE / HINT

Note


  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

  • When the 4WD ECU assembly is replaced with a known good one from another vehicle, it is necessary to perform calibration.

    Click here

Tech Tips

Check the condition of each related circuit connector before troubleshooting.

Click here

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (IG1 TERMINAL)


    1. Disconnect the R10 4WD ECU assembly connector.

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      R10-3 (IG1) -Body ground Engine switch on (IG) 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 engine switch off.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R10-4 (GND) -Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. RECONFIRM DTC


    1. Connect the R10 4WD ECU assembly connector.

    2. Clear the DTCs.

      Click here


      Chassis > Four Wheel Drive > Clear DTCs

    3. Turn the engine switch off.

    4. Turn the engine switch on (IG).

    5. Check that no DTCs other than DTC C120C/79 are 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