ACTIVE TORQUE CONTROL 4WD SYSTEM, Diagnostic DTC:C1241

DTC Code DTC Name
C1241 Low Power Supply Voltage Malfunction

DESCRIPTION

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

DTC No. DTC Detection Condition Trouble Area
C1241

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


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

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

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


    • The IG1 terminal voltage 17 V or more.

  • Battery

  • ECU-IG1 No.2 fuse

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

  • Brake control system

  • CAN communication system

  • 4WD control ECU

WIRING DIAGRAM

A019LJZE01

INSPECTION PROCEDURE

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. Check if the CAN communication system DTC is output Click here.

    2. Start the engine.

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

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

    B

    REPAIR CIRCUIT INDICATOR BY OUTPUT CODE (CAN COMMUNICATION SYSTEM) Click here

    C

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

    A

  2. INSPECT BATTERY


    1. Check the battery voltage.

      Standard Voltage
      11 to 14 V

    NG

    INSPECT CHARGING SYSTEM

    OK

  3. CHECK WIRE HARNESS (4WD CONTROL ECU - BATTERY)

    A019JTYE20
    Text in Illustration
    *1

    Rear view of wire harness connector

    (to 4WD Control ECU)

    1. Disconnect the ECU connector.

    2. Measure the voltage of the wire harness side connector.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      O2-11 (IG1) - Body Ground Engine switch on (IG) 10 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK WIRE HARNESS (4WD CONTROL ECU - BODY GROUND)

    A019JTYE21
    Text in Illustration
    *1

    Rear view of wire harness connector

    (to 4WD Control ECU)

    1. Disconnect the ECU connector.

    2. Measure the resistance of the wire harness side connector.

      Standard Resistance
      Tester Connection Condition Specified Condition
      O2-23 (GND) - Body Ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. RECONFIRM DTC


    1. Clear the DTC Click here.

    2. Start the engine.

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

      Result
      Result Proceed to
      DTC is output (for LHD) A
      DTC is output (for RHD) B
      DTC is not output C

      Tech Tips

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


    B

    REPLACE 4WD ECU ASSEMBLY (for RHD) Click here

    C

    CHECK INTERMITTENT PROBLEMS

    A

    REPLACE 4WD ECU ASSEMBLY (for LHD) Click here