Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Jeep >> 1996 >> Cherokee Classic, Part Time, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 4.0L >> Diagnostic Trouble Code (DTC) Identification >> Test NS-3A - Checking Engine Mechanical System

Test NS-3A - Checking Engine Mechanical System

NOTE: For connector terminal identification, refer to CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.
  1. Disconnect Manifold Absolute Pressure (MAP) sensor connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-1A . If connector and terminals are okay, go to next step.
  2. Turn ignition on. Using scan tool in voltmeter mode, check voltage on MAP sensor connector, 5-volt supply circuit (Violet/White wire). If voltage is 4.5 volts or less, repair open 5-volt supply circuit and perform TEST VER-1A. If voltage is more than 4.5 volts, go to next step.
  3. Reconnect MAP sensor connector. Remove all spark plugs. Inspect spark plug tips for wet fuel. If spark plug tips are wet, clean spark plugs and perform TEST VER-1A . If spark plug tips are not wet, reinstall spark plugs and go to next step.
  4. Inspect spark plug cables for correct placement. Reposition cables as necessary and perform TEST VER-1A. If spark plug cables are installed correctly, go to next step.
  5. Turn ignition off. Check valve timing. Correct valve timing as necessary and perform TEST VER-1A . If valve timing is okay, replace MAP sensor and perform TEST VER-1A.
scientia non olet · About Mike's Workshop Manuals