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Diagnostic Procedures

  1. Make sure all NON-EEC problems are solved first. Loose wires, low compression, fouled plugs, etc. can cause problems that waste valuable servicing time.
  2. Connect test equipment (as described later in this article) to the engine.
  3. Perform Key On-Engine Off Self-Test for your engine. This checks input and output circuits. If any codes appear, refer to the proper test shown in the reference table for that engine. Start with the first code displayed. If the tests refer you to other checks, perform them as instructed.
  4. Perform the Computed Timing Check. This checks the system's spark timing ability.
  5. Do the Engine Running Self-Test. This is a system check with sensors and output devices. If any codes appear, refer to the proper test shown in the reference table.
  6. To check for intermittent problems, perform the Continuous Self-Test. This monitors the inputs for shorts and open circuits as you wiggle wires and connectors.
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