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DTC 3 Or DTC 1 & 3 - Motor Circuit Fault

  1. Check 25-amp 4WD fuse. If blown, replace fuse and go to next step. if fuse is okay, go to step 3).
  2. Test drive vehicle and attempt to shift transfer case. if 4WD fuse is blown, go to next step. If fuse is okay, restore electrical connections and recheck for DTCs and symptom. If DTC does not return, fault is intermittent.
  3. Check transfer case harness connector for corrosion and damage. Repair if necessary. Replace 4WD fuse it blown. Turn ignition on. Measure voltage between Black wire and Red wire at shift motor harness connector while operating 4WD selector switch between 4HI and 4LOW. Voltmeter should fluctuate between positive and negative voltage. If voltage fluctuates, go to next step. If voltage does not fluctuate, go to step 5).
    NOTE: Ensure transfer case is mechanically sound before proceeding with next step.
  4. Replace transfer case encoder and shift motor assembly. Restore electrical connections and recheck for DTCs and symptom.
  5. Check TCCM harness connectors for corrosion and damage. Repair if necessary. Turn ignition on. Measure voltage between ground and TCCM harness connector terminals D14 and D15 (Orange wires). If battery voltage does not exist, repair open Orange wire between fuse panel and TCCM. If battery voltage exists, go to next step.
  6. Check Black wire and Red wire between shift motor and TCCM harness connectors for open or short to ground. Repair as necessary. If Red and Black wires are okay, replace TCCM. Recheck For DTCs and symptom.
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