DYNAMIC TORQUE CONTROL 4WD/AWD SYSTEM, Diagnostic DTC:C1241/94

DTC Code DTC Name
C1241/94 Low Power Supply Voltage

DESCRIPTION

If a malfunction in the power source circuit occurs, or a malfunction in communication with the skid control ECU (brake actuator assembly) or in a speed sensor occurs, the 4WD ECU assembly will prohibit operations by the fail-safe function.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
C1241/94 Low Power Supply Voltage

  1. When the following continues for 10 seconds or more:


    • At a vehicle speed of 3 km/h (2 mph) or more, voltage of IG1 terminal is 9.5 V or less.

  2. When either of the following is detected:


    • With the IG1 terminal voltage 9.5 V or less, communication with the skid control ECU (brake actuator assembly) is impossible.

    • Vehicle speed sensor voltage is reduced for 60 seconds or more.

  3. When the following continues for 3 seconds or more:


    • With the IG1 terminal voltage 17 V or more, communication with the skid control ECU (brake actuator assembly) is impossible.

  • Battery

  • Charging system

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

  • Brake control system

  • CAN communication system

  • 4WD ECU assembly

 DTC stored

WIRING DIAGRAM

A0028LHE07

CAUTION / NOTICE / HINT

Note

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

Tech Tips

Check the condition of each related circuit connector before troubleshooting.

Click here

PROCEDURE


  1. CHECK FOR DTC (CAN COMMUNICATION SYSTEM AND BRAKE CONTROL SYSTEM)


    1. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRAC > Clear DTCs

    2. Turn the ignition switch off.

    3. Turn the ignition switch to ON again and check that no CAN communication system DTCs are output.

      Click here

    4. Start the engine.

    5. Drive the vehicle, accelerate to a speed of 3 km/h (2 mph) or more for 60 seconds or more, and check if the speed sensor DTC (brake control system DTC) is output.

      Click here


      Chassis > ABS/VSC/TRAC > Trouble Codes

      Tech Tips

      When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before repairing each corresponding sensor.

      Result
      Result Proceed to
      Neither CAN communication system DTCs nor speed sensor DTCs (brake control system DTC) are output A
      CAN communication system DTCs are output B
      Brake control system (speed sensor) DTC is output C

    B

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    C

    REPAIR CIRCUIT INDICATED BY OUTPUT CODE (BRAKE CONTROL SYSTEM) Click here

    A

  2. INSPECT BATTERY


    1. Check the battery voltage.

      Standard Voltage
      11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    CHECK CHARGING SYSTEM Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (IG1 TERMINAL)


    1. A002COYC28
      *a

      Front view of wire harness connector

      (to 4WD ECU Assembly)

      Disconnect the F14 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 Condition Specified Condition
      F14-3 (IG1) - Body ground Ignition switch ON 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (GND TERMINAL)


    1. Turn the ignition switch off.

    2. A002COYC29
      *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
      F14-4 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. RECONFIRM DTC


    1. Clear the DTCs.

      Click here


      Chassis > Four Wheel Drive > Clear DTCs

    2. Start the engine.

    3. Drive the vehicle, accelerate to a speed of 3 km/h (2 mph) or more for 60 seconds or more, and check if the same DTC is output.

      Click here


      Chassis > Four Wheel Drive > Trouble Codes

      Tech Tips

      Reinstall the sensor, connectors, etc. and restore the vehicle to its prior condition before rechecking DTCs.

      Result
      Result Proceed to
      DTCs are output A
      DTCs are not output B

    A

    REPLACE 4WD ECU ASSEMBLY Click here

    B

    CHECK FOR INTERMITTENT PROBLEMS Click here