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Inspecting Mechanical System

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION. For wiring diagram, see WIRING DIAGRAMS - 3.5L article in ENGINE PERFORMANCE. After each repair, perform TEST VER-1  .
  1. Disconnect Manifold Absolute Pressure (MAP) sensor connector. Turn ignition on. Using scan tool in voltmeter mode, check voltage on MAP sensor connector terminal No. 3 (Violet/White wire). If voltage is less than 4.5 volts, repair open Violet/White wire. If voltage is more than 4.5 volts, go to next step.
  2. Reconnect MAP sensor connector. Remove all spark plugs. Inspect spark plug tips for wet fuel. If spark plug tips are wet, clean spark plugs. If spark plug tips are not wet, reinstall spark plugs. Go to next step.
  3. Inspect spark plug cables for correct placement. Reposition cables as required. If spark plug cables are installed correctly, go to next step.
  4. Using scan tool, read total spark advance while cranking engine. If spark advance is not 0-25 degrees BTDC, replace Powertrain Control Module (PCM). PCM is located under air cleaner. If spark advance is 0-25 degrees BTDC, go to next step.
  5. Turn ignition off. Check valve timing. Correct valve timing as required. If valve timing is okay, check engine compression. Repair as required. If engine compression is okay, replace MAP sensor.
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