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Diagnostic Circuit Check

  1. If complaint is "CHECK ENGINE" lamp related, this check will lead to most likely problem area, if malfunction exists. Enter diagnostics and record stored trouble codes. Begin diagnosis with lowest numbered code which is displayed and refer to appropriate trouble code chart.
  2. If code "51" is displayed, refer to PROM removal and installation in this article for diagnosis of this code. If codes "54" or "55" are displayed with another code, always refer to diagnostic chart for code "54" or "55" first, then proceed to next lowest numbered code.
    NOTE: Any time codes "51", "54" or "55" are displayed with another code, start with "50-series" code first, then proceed to lowest numbered code.
  3. If complaint is not "CHECK ENGINE" lamp related, this check will lead to most likely problem area. However, first make checks that would normally be made for the complaint on a vehicle without CCC system.
  4. Follow instructions in diagnostic chart and repair malfunction. After repair, perform System Performance Check/Field Service Mode Check.
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