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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 control circuit terminals and ground:
    • Coil supply circuit terminal 5
    • Low reference circuit terminal 3
      • If the test lamp illuminates, test the appropriate control circuit for a short to voltage.
  3. Ignition OFF, test for infinite resistance between the following control circuit terminals and ground:
    • Coil supply circuit terminal 5
    • Low reference circuit terminal 3
      • If less than the specified value, test the appropriate control circuit for a short to ground.
  4. Test for less than 5.0 ohms of resistance between the coil supply terminal 5 and the low reference circuit terminal 3.
    • If greater than the specified range, test both control circuits for an open/high resistance. If the circuits test normal, replace the differential clutch coil.
  5. If all circuits test normal, replace the CCM.
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