Code No. C145F: Coupling Overload



caution If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, always diagnose the CAN bus lines.

OPERATION


If 4WD-ECU determines that the vehicle is used under some severe operational conditions (such as a long-time driving in 4WD on a sandy road, slushy road or road with deep snows or towing or long hill-climbing), 4WD-ECU detects the overload to the coupling. If abnormal overload is detected, 4WD-ECU interrupts the system to prevent it from being damaged.

DIAGNOSIS CODE SET CONDITIONS


If the following conditions are met, 4WD-ECU gradually switches the control from 4WD to 2WD, makes the drive system fluid temperature warning lamp illuminate, and sets the diagnosis code No. C145F.


PROBABLE CAUSES


Current trouble
Past trouble

DIAGNOSIS PROCEDURE


STEP 1. M.U.T.-III CAN bus diagnostics


Use M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?

Go to Step 4.
Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting ). On completion, go to Step 2.

STEP 2. Check whether the diagnosis code is reset after repairing the CAN bus line.


(1)Erase the diagnosis code.
(2)Turn the ignition switch from the LOCK (OFF) position to the ON position.
(3)Check if the diagnosis code is set.

Q. Is the diagnosis code No. C145F set?

Go to Step 3.
This diagnosis is complete.

STEP 3. M.U.T.-III Diagnosis code of other systems


Check the following service data (Refer to ).

  • Item 07: CAN data (ABS/ASC)
  • Item 16: FL wheel speed sensor
  • Item 17: FR wheel speed sensor
  • Item 18: RL wheel speed sensor
  • Item 19: RR wheel speed sensor

Q. Is the diagnosis code set?

Troubleshoot the ABS system (Refer to GROUP 35C - Troubleshooting ).
Go to Step 4.

STEP 4. M.U.T.-III actuator test


On a chassis dynamometer test, use M.U.T.-III to forcibly activate the electronic control coupling from 600 N·m to 730 N·m in 10 N·m steps (Refer to ).
Or on a test run of the vehicle, turn fully the steering wheel (lock condition) and use M.U.T.-III to forcibly activate the electronic control coupling at 500 N·m (Refer to ). Then drive the vehicle forward (or back) at about 10 km/h. If the system is normal, tight cornering phenomenon should occur.

  • Item 01: 4WD coupling control torque

Q. Does the electronic control coupling transfer the torque correctly?

Go to Step 5.
Replace the electronic control coupling (Refer to ). Then go to Step 6.

STEP 5. Check whether the diagnosis code is reset.


(1)Erase the diagnosis code.
(2)Turn the ignition switch from the LOCK (OFF) position to the ON position.
(3)Check if the diagnosis code is set.

Q. Is the diagnosis code No. C145F set?

Replace 4WD-ECU (Refer to ). Then go to Step 6.
The code may be set because of some severe operational conditions such as a long-time high speed driving or long hill-climbing in 4WD condition.

STEP 6. Check whether the diagnosis code is reset.


Q. Is the diagnosis code No. C145F set?

Diagnose again from Step 1.
This diagnosis is complete.

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