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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 35 (Engine Controls - Tests W/Codes - 3.9L) >> No-Start Tests >> Test NS-3A - Inspecting Mechanical System

Test NS-3A - Inspecting Mechanical System

WARNING: This page is about a different car, the 1995 Dodge Ram Wagon, 1995 Dodge Ram Van, 1995 Dodge Pickup, 1995 Dodge Dakota, and 1995 Dodge Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS  section at the end of this article.
  1. Disconnect Manifold Absolute Pressure (MAP) sensor electrical connector. 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 less than 4.5 volts, repair open Violet/White wire. Perform TEST VER-1.
  2. If voltage is more than 4.5 volts, reconnect MAP sensor electrical connector. Remove all spark plugs. Inspect spark plug tips for wet fuel. If spark plug tips are wet, clean and reinstall spark plugs. If spark plug tips are not wet, reinstall spark plugs.
  3. Inspect spark plug cables for correct placement. Reposition cables as required. Perform TEST VER-1. If cables are okay, turn ignition off. Check valve timing. Adjust valve timing as necessary. Perform TEST VER-1. If valve timing is okay, replace MAP sensor. Perform TEST VER-1.