FOUR WHEEL DRIVE CONTROL 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 and, when 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 Click here.

DTC No. DTC Detection Condition Trouble Area
C1241/94

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


    • At a vehicle speed of 3 km/h (2 mph) or more, the 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.

  • RH-IG fuse

  • Battery

  • Charging system

  • Harness or connector (IG1 circuit, GND circuit)

  • Brake control system (speed sensor circuit)

  • CAN communication system

  • 4WD ECU assembly

WIRING DIAGRAM

A01FH0RE01

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 DTC


    1. Clear the DTC Click here.

    2. Turn the engine switch on (IG) and check that no CAN communication system DTC is output.

    3. Start the engine.

    4. Drive the vehicle, accelerating to a speed of 3 km/h (2 mph) or more and check that no speed sensor DTC (brake control system DTC) is output Click here, and 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 INDICATED 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 Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (IG1 TERMINAL)


    1. A01FIPAE04
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to 4WD ECU Assembly)

      Disconnect the 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

      A33-11 (IG1) -

      Body ground

      		 Engine switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)

    OK

  4. CHECK HARNESS AND CONNECTOR (GND TERMINAL)


    1. A01FIPAE05
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to 4WD ECU Assembly)

      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

      A33-23 (GND) -

      Body ground

      		 Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)

    OK

  5. RECONFIRM DTC


    1. Clear the DTC Click here.

    2. Start the engine.

    3. Drive the vehicle, accelerating 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 4WD ECU ASSEMBLY Click here