Inspection Procedure 2: Shifting the 4WD Switch does not Change the Mode.
COMMENTS ON TROUBLE SYMPTOM
- If the drive mode cannot be switched by pushing the 4WD switch, the 4WD switch, the wiring harness wires between the 4WD-ECU and the 4WD switch, the wiring harness wire in the earth circuit for the 4WD switch, the 4WD-ECU or the combination meter may have a problem.
PROBABLE CAUSES
- Damaged wiring harness and connectors
- Malfunction of 4WD switch
- 4WD-ECU malfunction
- Combination meter malfunction
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STEP 1. 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 3.
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Repair the CAN bus lines (Refer to GROUP 54C -
Troubleshooting ). After repairing the CAN bus line, go to Step 2.
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STEP 2. Retest the system.
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Q.
Does the malfunction occur again?
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The trouble can be an intermittent malfunction (Refer to GROUP 00 -
How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ).
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Go to Step 3.
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STEP 3. M.U.T.-III actuator test.
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Combination meter item No.5: Meter illumination (Refer to GROUP 54A -
Combination Meter ).
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Q.
Is the check result normal?
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Go to Step 4.
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Replace the combination meter. (Refer to GROUP 54A -
Combination Meter ). Then go to Step 8.
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STEP 4. Resistance measurement between the 4WD switch connector terminals
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(1)Remove the 4WD switch (Refer to ).
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(2)Measure the resistance between the terminals (Refer to ).
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Q.
Is the check result normal?
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Go to Step 5.
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Replace the 4WD switch (Refer to ). Then go to Step 8.
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STEP 5. Wiring harness check
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(1)Check the wiring harness between the 4WD-ECU connector (terminal sw-1) and the 4WD switch connector.
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(2)Check the connector(s) or terminal(s) or wiring harness above for damage or other problem.
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Q.
Is the check result normal?
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Go to Step 6.
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Repair the connector(s) or terminal(s) or wiring harness.
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STEP 6. Resistance measurement at the 4WD switch connector
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(1)Disconnect the 4WD switch connector.
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(2)Measure the resistance between the 4WD switch wiring harness side connector and the body earth. OK: Continuity exists (2 Ω
or less)
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Q.
Is the check result normal?
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Go to Step 7.
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Repair the connector(s) or terminal(s) or wiring harness.
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STEP 7. M.U.T.-III data list.
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Check the following data list. (Refer to ).
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- Item 1: AWC (4WD) control mode
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Q.
Is the check result normal?
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Go to Step 9.
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Go to Step 8.
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STEP 8. Retest the system.
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Q.
Does the malfunction occur again?
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Replace 4WD-ECU (Refer to ). Then go to Step 9.
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The trouble can be an intermittent malfunction (Refer to GROUP 00 -
How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ).
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STEP 9. Retest the system.
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Q.
Does the malfunction occur again?
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Troubleshoot the combination meter multi information display (Refer to GROUP 54A -
Troubleshooting/CAN Bus Diagnostics Table ). Then diagnose again from Step 1.
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This diagnosis is complete.
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