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Test NTC-2A - Checking Secondary Ignition & Timing

NOTE: Perform TEST NTC-1A before proceeding.
  1. Turn engine off. Connect engine analyzer to engine. Start engine, and let it idle. If engine will not idle, maintain engine speed for reading scope pattern. Set scope to read display or parade pattern. Follow equipment manufacturer's procedure for pattern analysis.
  2. If secondary ignition pattern is not okay, repair indicated component in secondary ignition system. Perform TEST VER-2A. If secondary ignition pattern is okay, momentarily disconnect each spark plug wire one at a time from ignition coil. Observe secondary kilovolt line.
  3. If open circuit secondary voltage is not at least 25 kilovolts, replace electronic ignition coil. Perform TEST VER-2A. If open circuit secondary voltage is at least 25 kilovolts, go to next step.
  4. Turn engine off. Remove all spark plugs. Check engine compression. If all cylinders do not have a minimum compression of 100 psi (7.0 kg/cm2 ) and compression in cylinders is not within 25 percent of each other, repair engine mechanical problem as necessary. Perform TEST VER-2A. If all cylinders have a minimum compression of 100 psi (7.0 kg/cm2 ) and compression in cylinders is within 25 percent of each other, go to next step.
  5. Reinstall spark plugs and spark plug wires. Start engine. Run engine until engine coolant temperature is greater than 180°F (82°C). Ensure engine coolant temperature is greater than 180°F (82°C) before proceeding.
  6. Using scan tool, read total ignition timing advance. Increase engine speed to 2000 RPM. If ignition timing advance does not change with increase in engine RPM, replace Powertrain Control Module (PCM). Perform TEST VER-2A. If ignition timing advance changes with increase in engine speed, secondary ignition system and ignition timing advance are normal. Test is complete.
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