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Diagnostic Procedure

  1. The checks and codes for each engine are in separate sections of this article. Use the directory at the front of the article to locate the correct page. The headings at the top of the pages will also help you find the test for your engine.
  2. Always use the same sequence when diagnosing driving or running problems on a vehicle equipped with EEC-IV. Make sure all NON-EEC problems are solved first. Loose wires, low compression, fouled plugs, etc. can cause problems that waste valuable servicing time.
  3. Connect test equipment (as described later in this article) to the engine. The location of the Self-Test connector varies with model. See Self-Test Connector Location in this article. The location will also be described in each engine testing section.
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