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

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

WIRING DIAGRAM

C278265E04

CAUTION / NOTICE / HINT

Tip:

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 CAN communication system DTCs are output.

      for LHD:Click here

      for RHD: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 the speed sensor DTC (brake control system DTC) is output.

      w/o VSC:Click here

      w/ VSC:Click here

      Chassis > ABS/VSC/TRC > Trouble Codes

      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 (for LHD)

      B

      CAN communication system DTC is output (for RHD)

      C

      Speed sensor DTC (brake control system DTC) is output (w/o VSC)

      D

      Speed sensor DTC (brake control system DTC) is output (w/ VSC)

      E

    B

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

    C

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

    D

    REPAIR CIRCUIT INDICATED BY OUTPUT CODE (BRAKE CONTROL SYSTEM)

    E

    REPAIR CIRCUIT INDICATED BY OUTPUT CODE (BRAKE CONTROL SYSTEM)

    A
  2. INSPECT BATTERY

    1. Check the battery voltage.

      Standard voltage

      11 to 14 V

    Result

    Proceed to

    OK

    NG (for 2AR-FE)

    NG (for 2AD-FHV)

    NG (for 2AD-FTV)

    NG (for 3ZR-FAE)

    NG (for 3ZR-FE)

    NG (for 2AR-FE)

    CHECK CHARGING SYSTEM

    NG (for 2AD-FHV)

    CHECK CHARGING SYSTEM

    NG (for 2AD-FTV)

    CHECK CHARGING SYSTEM

    NG (for 3ZR-FAE)

    CHECK CHARGING SYSTEM

    NG (for 3ZR-FE)

    CHECK CHARGING SYSTEM

    OK
  3. CHECK HARNESS AND CONNECTOR (IG1 TERMINAL)

    1. C270074C06

      *a

      Front view of wire harness connector

      (to 4WD ECU Assembly)

      Disconnect the 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

      Switch Condition

      Specified Condition

      G86-3 (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. C270074C07

      *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

      G86-4 (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 DTC.

      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, and check if the same DTC is output.

      Click here

      Chassis > Four Wheel Drive > Trouble Codes

      Result

      Proceed to

      DTC is output

      DTC is not output

      Tip:

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

    DTC is output

    REPLACE 4WD ECU ASSEMBLY

    DTC is not output

    CHECK FOR INTERMITTENT PROBLEMS