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• 10:41, 6 July 2026 Cliff talk contribs created page Diagnostic trouble codes (Created page with "'''Diagnostic trouble codes''' are fault codes stored by the ECM when the engine control system detects certain problems. On the Pontiac Fiero, trouble codes can be read through the ALDL diagnostic connector by placing the ECM into diagnostic mode and watching the check engine light flash the stored codes. == Overview == Fiero diagnostic trouble codes are not the same as modern OBD-II codes. They are earlier GM ECM trouble codes and are di...")