Hyundai Tucson: Automatic Transaxle Control System / Inhibitor Switch Troubleshooting

Fault Diagnosis
Fault Diagnosis for Symptom
Major Symptom
Expected Cause
Items to Check and Measures
Shift lever not operating
Gear not marked on cluster
Shock occurs while shifting lever Warning lamp ON
Engine OFF while vehicle is parked
Inhibitor switch circuit abnormal
Inhibitor switch function abnormal
Check the inspection FLOW and replace the inhibitor switch
Inhibitor switch "N" setting faulty
Adjust "N" setting using "N" setting jig (refer to automatic transmission system - "inhibitor switch")
Shift cable separation faulty
Adjust shift cable separation (refer to automatic transmission system - "inhibitor switch")
Poor ground condition on reversing light circuit
Check the ground condition on reversing light and retighten it
Inhibitor switch vehicle side circuit abnormal
Check the connection of junction box power terminal, fuse (TCU2) terminal and replace the junction box or adjust the gap
Check inside the inhibitor switch connector for foreign substance and whether terminal is bent
Poor ground condition on inhibitor switch wire
Check the ground condition of wire and retighten it
Poor inhibitor unit (disconnection/short-circuit)
Replace inhibitor switch (refer to inhibitor switch inspection)

Inhibitor Switch Schematic Diagrams
Circuit Diagram ...

Inhibitor Switch Repair procedures
Inspection     • Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Inspection flow Items to ch ...

Other information:

Hyundai Tucson (LM) 2010-2015 Service Manual: Auto Light Switch Repair procedures
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Hyundai Tucson (LM) 2010-2015 Owners Manual: 90,000 miles (144,000 km) or 72 months
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