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Diagnostic Circuit Check

  1. If complaint is "CHECK ENGINE" light 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 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 code.
  3. If codes "51", "54" or "55" are displayed within another code, always refer to diagnostic chart for "50" series code first. Then proceed to next lowest numbered code.
  4. If codes "13" and "21", "14" and "21" or "15" and "21" are displayed, start with code "21" first, then proceed to "13", "14" or "15".
  5. On vehicles with manual transmissions, if codes "13" and "34", "14" and "34" or "15" and "34" are displayed, start with code "34" first, then proceed to code "13", "14" or "15".
  6. If "intermittent failure" codes "13", "15", "24", "35", "44", "45" or "55" are displayed, use diagnostic chart for corresponding "hard failure" code.
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