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Diagnosis & Repair

  1. Disconnect CMP sensor harness connector. CMP sensor is located on transmission side of cylinder head, below oil filler cap. Measure resistance between CMP sensor terminals (component side). Resistance should be 835-1400 ohms at 14-122°F (-10-50°C) and 1060-1645 ohms at 122-212°F (50-100°C). If resistance is as specified, go to next step. If resistance is not as specified, replace CMP sensor.
  2. Check for open or short in wiring between ECM and CMP sensor. See WIRING DIAGRAMS article. If problem does not exist, go to next step. If problem exists, repair wiring as necessary.
  3. Remove and inspect CMP sensor. Also, inspect camshaft signal plate on intake camshaft. If problem exists, replace CMP sensor and/or camshaft timing pulley as necessary. If problem does not exist, replace ECM.
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