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Test NS-3A: Checking Engine Mechanical System

  1. Turn ignition off. Inspect spark plug cables for correct placement. Reposition cables as necessary. See illustration under FIRING ORDER under IGNITION SYSTEM in SERVICE & ADJUSTMENT SPECIFICATIONS article. Perform TEST VER-1A. If spark plug cables are installed correctly, go to next step.
  2. Ensure ignition is off. Check valve timing. Correct valve timing as necessary. Perform TEST VER-1A. If valve timing is okay, go to next step.
  3. Ensure ignition is off. Start engine and allow it to idle. Check exhaust system for restrictions. Repair exhaust system as necessary. Perform TEST VER-1A. If exhaust system is okay, go to next step.
  4. Remove ASD relay. ASD relay is located in Power Distribution Center (PDC). PDC is located next to battery. Refer to label under PDC cover for relay location. Remove spark plugs. Check engine compression. For compression specifications, see ENGINE COMPRESSION under MECHANICAL CHECKS in SERVICE & ADJUSTMENT SPECIFICATIONS article. Repair engine mechanical condition as necessary. Perform TEST VER-1A. If compression is okay, go to next step.
  5. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-1A.
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