GM Lumina/Silhouette/Transport APVs 1990-1999 Repair Guide

TROUBLE CODES

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See Figures 1, 2 and 3

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Fig. Fig. 1: Powertrain control module diagnosis



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Fig. Fig. 2: Powertrain control module diagnosis



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Fig. Fig. 3: Powertrain control module diagnosis

The preliminary checks and the Powertrain ON-Board Diagnostic system check must be performed to successfully diagnose and re-pair the powertrain systems.

To read and clear diagnostic trouble codes; it is recommended to use a scan tool. Diagnostic trouble codes (DTC)'s can also be cleared by turning off the ignition and disconnecting the battery power from the PCM for 30 seconds. This method will also cause all diagnostic information in the PCM memory to be cleared and all the diagnostic tests will have to be re-run.

 
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