Code No. C145F:
Coupling Overload
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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.
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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.
- Drive mode selector: 4WD or LOCK
- When the load to the electronic control coupling is large, the mode is switched
to the 2WD mode.
PROBABLE CAUSES
Current trouble
- The driving conditions are severe.
- Electronic control coupling failure (clutch slippage)
- 4WD-ECU malfunction
- Abnormality in ABS wheel speed signal
- Abnormality in torque command value from the ABS-ECU
Past trouble
- The past driving conditions were severe.
- Electronic control coupling intermittent failure (clutch slippage)
- Abnormality in ABS wheel speed signal
- Abnormality in torque command value from the ABS-ECU
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STEP 1. M.U.T.-III CAN bus diagnostics
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Use M.U.T.-III to diagnose the CAN bus lines.
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Q.
Is the check result normal?
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 Go to Step 4.
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 Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting  ).
On completion, go to Step 2.
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STEP 2. Check whether the diagnosis code is reset after repairing
the CAN bus line.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from the LOCK (OFF) position to the ON position.
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(3)Check if the diagnosis code is set.
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Q.
Is the diagnosis code No. C145F set?
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Go to Step 3.
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This diagnosis is complete.
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STEP 3. M.U.T.-III Diagnosis code of other systems
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Check the following service data (Refer to ).
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- 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
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Q.
Is the diagnosis code set?
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Troubleshoot the ABS system (Refer to GROUP 35C - Troubleshooting ).
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Go to Step 4.
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STEP 4. M.U.T.-III actuator test
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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 ).
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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.
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- Item 01: 4WD coupling control torque
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Q.
Does the electronic control coupling transfer the torque correctly?
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Go to Step 5.
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Replace the electronic control coupling (Refer to ).
Then go to Step 6.
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STEP 5. Check whether the diagnosis code is reset.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from the LOCK (OFF) position to the ON position.
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(3)Check if the diagnosis code is set.
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Q.
Is the diagnosis code No. C145F set?
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Replace 4WD-ECU (Refer to ). Then go to Step 6.
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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.
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STEP 6. Check whether the diagnosis code is reset.
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Q.
Is the diagnosis code No. C145F set?
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Diagnose again from Step 1.
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This diagnosis is complete.
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