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Home >> GMC >> 1992 >> Forward Control 5.7 K, Standard >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Diagnosis - A/T >> Testing & Diagnosis (Exc. REATTA, Riviera, TORONADO & TROFEO) >> Retrieving Trouble Codes

Retrieving Trouble Codes

The ECM stores component failure information under a related trouble code, which can be recalled later for diagnosis and repair. When recalled, these codes can be displayed on a scan tester, or by entering diagnostic mode and observing flashes of the SERVICE ENGINE SOON light. It is NOT necessary to enter diagnostic mode to use TCC test charts; however, it will be necessary to enter ECM diagnostic mode to verify the presence of any codes.

NOTE: Even when using a scan tester, it is recommended that the diagnostic mode be accessed in advance to verify the computer's ability to self-diagnose.
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