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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 29 (Engine Controls - Tests W/Codes - 3.3L Gasoline) >> No-Start Tests >> Test NS-1A - Qualifying No-Start Condition

Test NS-1A - Qualifying No-Start Condition

WARNING: This page is about a different car, the 1995 Plymouth Voyager, 1995 Plymouth Grand Voyager, 1995 Dodge Grand Caravan, and 1995 Dodge Caravan. 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 diagrams, see WIRING DIAGRAMS  section at the end of this article.
  1. Attempt to crank engine. If engine does not crank, go to TEST NS-9A. If engine cranks, turn ignition off. Turn ignition on, but DO NOT crank engine. Using scan tool, read Distributorless Ignition System (DIS) signal. If scan tool detects crankshaft signal, replace crank sensor. Perform TEST VER-1.
  2. If scan tool does not detect crank signal, but detects camshaft signal, replace cam sensor. If scan tool does not detect crankshaft or camshaft signal, observe scan tool display while cranking engine. If scan tool does not display CRANK and CAM, go to TEST TC-2A. If scan tool displays CRANK and CAM, go to next step.
    CAUTION: When checking for spark, Powertrain Control Module (PCM) damage may occur if spark plug cable is held more than 1/4" away from ground.
  3. Turn ignition off. Disconnect any spark plug cable at spark plug. Insert an insulated screwdriver in spark plug cable terminal. Hold screwdriver within 1/4" of ground.
    NOTE: When checking for spark, consider one or two sparks as a no-spark condition.
  4. While cranking engine for 10 seconds, watch for spark. If a good spark occurs, go to TEST NS-2A. If a good spark does not occur, reconnect spark plug cable. Disconnect another spark plug cable at spark plug, and repeat test.
  5. If a good spark occurs, replace spark plug cable that was initially used to test for spark. If a good spark does not occur, disconnect ignition coil connector. Inspect all related wiring and connectors, and repair as necessary. Perform TEST VER-1. If no problems are found with wiring and connectors, replace ignition coil. Perform TEST VER-1.
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