4WD Control System Symptom Diagnosis
Precautions: Precautions for Diagnosing Trouble · Precautions for Driveline / Axle · General safety (00)
Diagnose 4WD control system after performing the following inspection:
| Condition | Possible Cause | Action |
|---|---|---|
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4WD system does not operate
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Faulty driving mode switch
|
Check switch referring to Driving Mode Switch Inspection.
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Faulty rear drive coupling air temperature sensor
|
Check rear drive coupling air temperature sensor referring to Rear Drive Coupling Air Temperature Sensor Inspection.
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Faulty rear drive coupling unit
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Check rear drive coupling unit referring to Rear Drive Coupling Assembly Inspection.
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Faulty transfer oil temperature sensor
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Check transfer oil temperature sensor referring to Transfer Oil Temperature Sensor Inspection.
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Faulty wiring or grounding
|
Repair wiring.
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Faulty 4WD control module
|
Check 4WD control module referring to Inspection of 4WD Control Module and Its Circuits.
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