DYNAMIC TORQUE CONTROL 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 communication malfunction with the skid control ECU (brake actuator assembly) or speed sensor occurs, the 4WD ECU assembly prohibits operation.

DTC No. Detection Item DTC Detection Condition Trouble Area
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 not possible.

    • Vehicle speed sensor voltage is abnormally low 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 not possible.

  • Battery

  • Charging system

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

  • Vehicle stability control system

  • CAN communication system

  • 4WD ECU assembly

WIRING DIAGRAM

B005M7ME04

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 FOR DTC (CAN COMMUNICATION SYSTEM AND VEHICLE STABILITY CONTROL SYSTEM)


    1. Check if CAN communication DTCs are output.

      Click here

    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 any DTCs related to a speed sensor are output.

      Click here


      Chassis > ABS/VSC/TRC/EPB > Trouble Codes
      Result
      Result Proceed to
      CAN communication system DTCs and vehicle stability control system DTCs are not output A
      CAN communication DTCs are output B
      Vehicle stability control system DTCs are output C

      Tech Tips

      If CAN communication DTCs are output, perform troubleshooting for the CAN communication system first.


    B

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

    C

    REPAIR CIRCUIT INDICATED BY OUTPUT CODE (VEHICLE STABILITY 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 for 2GR-FKS: Click here
    CHECK CHARGING SYSTEM for 8AR-FTS: Click here

    OK

  3. 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

  4. 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

  5. RECONFIRM DTC


    1. Connect the R10 4WD ECU assembly connector.

    2. Clear the DTCs.

      Click here


      Chassis > Four Wheel Drive > Clear DTCs

    3. Start the engine.

    4. 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
      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