LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Chevrolet >> 1996 >> Astro Van Cargo, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing 4.3L >> Ignition System >> Enhanced Ignition System Check >> Diagnostic Aids
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnostic Aids

NOTE: Numbers below refer to the step numbers in diagnostic test.
NOTE: Battery should be fully charged prior to any tests.
  1. Perform the OBD system check before proceeding unless it was already performed.
  2. Checks for proper output from the enhanced ignition system. The spark tester requires a minimum of 25,000 volts to operate. This check can be used in case of an ignition miss, because the system may provicle enough voltage to run the engine but not enough to operate a spark plug under heavy load.
  3. This test separates distributor cap, rotor and ignition wires from ignition coil in order to help identify a secondary ignition system problem.
  4. This test checks ignition control module, connections, and wiring.
  5. This test begins to determine if the VCM is providing a signal to the ignition control module. If the VCM is not providing a signal to the ignition control module, the problem exists between the ignition control module and the VCM.
  6. This test checks for a basic engine mechanical problem.
scientia non olet · About LEMON Manuals