Test NS-3A - Inspecting Mechanical System
WARNING: This page is about a different car, the 1995 Jeep Wrangler, 1995 Jeep Grand Cherokee, and 1995 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Perform TEST NS-2A
before proceeding with this test. For connector terminal identification, see CONNECTOR IDENTIFICATION
at beginning of article. For wiring diagrams, see WIRING DIAGRAMS
at the end of this article. Perform TEST VER-1A
after each repair.
- Disconnect Manifold Absolute Pressure (MAP) sensor 3-pin connector and ensure connector is clean and not damaged. Turn ignition on. Using scan tool in voltmeter mode, check voltage on 5-volt supply circuit at MAP sensor connector terminal No. 3 (Violet/White wire). If voltage is more than 4.5 volts, go to next step. If voltage is less than 4.5 volts, repair open in 5-volt supply circuit.
- Reconnect MAP sensor 3-pin connector. Remove all spark plugs and inspect spark plug tips for wet fuel. If spark plug tips are wet, clean and reinstall spark plugs and go to next step. If spark plug tips are not wet, reinstall spark plugs and go to next step.
- Inspect spark plug cables for correct placement. Reposition cables as necessary. If spark plug cables are okay, turn ignition off. Check valve timing. Repair engine as necessary to correct valve timing. If valve timing is okay, check engine compression. Repair engine as necessary to correct compression. If engine compression is okay, replace MAP sensor.