ACTIVE TORQUE CONTROL 4WD 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 or in a speed sensor occurs, the AWD control ECU will prohibit operations by the fail-safe function.

DTC No. DTC Detection Condition Trouble Area
C1241/94

  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-IG No.1 fuse

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

  • Brake control system

  • CAN communication system

  • AWD control ECU

WIRING DIAGRAM

A01EIY6E10

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
      Result
      Result Proceed to
      OK A
      NG B

    B

    INSPECT CHARGING SYSTEM Click here

    A

  3. CHECK WIRE HARNESS (AWD CONTROL ECU - BATTERY)

    A01ELWME16
    Text in Illustration
    *1

    Rear view of wire harness connector

    (to AWD 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
      D38-11 (IG1) - Body Ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

    A01ELWME17
    Text in Illustration
    *1

    Rear view of wire harness connector

    (to AWD Control ECU)

    1. Disconnect the ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D38-23 (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 A
      DTC is not output B

      Tech Tips

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


    B

    CHECK INTERMITTENT PROBLEMS Click here

    A

    REPLACE AWD CONTROL ECU Click here