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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector C1 at the rear differential clutch control module.
  2. Ignition ON, verify a test lamp does not illuminate between the following circuit terminals and ground:
    • Signal circuit terminal 4
    • Low reference circuit terminal 2
      • If the test lamp illuminates, test the appropriate circuit for a short to voltage.
  3. Ignition OFF, test for infinite resistance between the following circuit terminals and ground:
    • Signal circuit terminal 4
    • Low reference circuit terminal 2
      • If less than the specified value, test the appropriate circuit for a short to ground. If the circuit tests normal, replace the CCM temp sensor.
  4. Test for XX-XX ohms of resistance between the signal circuit terminal 4 and the low reference circuit terminal 2.
    • If less than the specified range, test both circuits for an open/high resistance. If the circuit tests normal, replace the CCM temp sensor.
    • If greater than the specified range, test both circuits for an open/high resistance. If the circuit tests normal, replace the CCM temp sensor.
  5. If all circuits test normal, replace the CCM.
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