Code No.C1621: Electronic control coupling solenoid (centre) protection
caution |
- If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines.
- Whenever the ECU is replaced, ensure that the CAN bus lines are normal.
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OPERATION
The 4WD-ECU calculates the electronic control coupling temperature by the information of the electronic control coupling control amount, outside temperate, etc. If it is detected that the electronic control coupling temperature becomes extremely high, the high fluid temperature warning is displayed on the warning indicator.
DIAGNOSIS CODE SET CONDITION
The electronic-controlled coupling is protected due to too high temperature.
PROBABLE CAUSES
- Electronic control coupling protection control status
- Severe driving
- Electronic control coupling failure (clutch slippage, etc.)
- Outside temperature signal failure
- Wheel speed signal failure
- Engine-related failure (engine speed signal failure)
- Ignition off time signal failure
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STEP 1. Check whether the diagnosis code is set again.
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(1)To release the electronic control coupling (Centre) protection control, leave the vehicle for 15 minutes or longer after the high fluid temperature warning on the warning indicator disappears.
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(2)Erase the diagnosis code.
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(3)Carry out the test drive.
note |
Do not carry out the severe test drive.
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(4)Check if the diagnosis code is set.
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Q.
Is diagnosis code No.C1621 set?
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Go to Step 2.
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction).
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STEP 2. M.U.T.-III CAN bus diagnostics.
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Use M.U.T.-III to perform the CAN bus diagnosis.
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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 lines (Refer to GROUP 54C - Troubleshooting ). After repairing the CAN bus line, go to Step 3.
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STEP 3. Check whether the diagnosis code is set again.
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Q.
Is diagnosis code No.C1621 set?
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Go to Step 4.
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This diagnosis is complete.
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STEP 4. M.U.T.-III data list
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Check the following data list.
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Q.
Is the check result normal?
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Go to Step 5.
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Perform the troubleshooting for the engine (Refer to GROUP 13D - Troubleshooting ).
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STEP 5. M.U.T.-III data list
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Check the following data list.
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- Item No.18: FL Wheel speed sensor
- Item No.19: FR Wheel speed sensor
- Item No.20: RL Wheel speed sensor
- Item No.21: RR Wheel speed sensor
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Q.
Is the check result normal?
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Go to Step 6.
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Perform the ASC diagnosis code (Refer to GROUP 35C - Troubleshooting ).
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STEP 6. M.U.T.-III data list
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Check the following data list.
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- Item No.34: Ambient temperature (CAN input)
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- Item No.35: Ignition off time (CAN input)
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Q.
Is the check result normal?
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Go to Step 7.
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Perform the troubleshooting for the ETACS (Refer to GROUP 54A - ETACS, Troubleshooting).
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STEP 7. Check of the electronic control coupling
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Q.
Is the check result normal?
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Go to Step 8.
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Replace the electronic control coupling.
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STEP 8. Check whether the diagnosis code is set again.
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(1)To release the electronic control coupling protection control, leave the vehicle for 15 minutes or longer after the high fluid temperature warning on the warning indicator disappears.
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(2)Erase the diagnosis code.
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(3)Carry out the test drive.
note |
Do not carry out the severe test drive.
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(4)Check if the diagnosis code is set.
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Q.
Is diagnosis code No.C1621 set?
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Replace the 4WD-ECU.
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction).
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