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Home >> Oldsmobile >> 2004 >> Bravada RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 456 (Engine Control System - Self-Diagnostics - 5.3L) >> Self-Diagnostic System >> On-Board Diagnostics >> Notes
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On-Board Diagnostics: Notes

WARNING: This page is about a different car, the 2003 GMC Envoy XL and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

PCM is equipped with a self-diagnostic system which detects system failures or abnormalities. When a malfunction occurs, PCM will store a Diagnostic Trouble Code (DTC) and, in most cases, illuminate the Malfunction Indicator Light (MIL) located on instrument cluster.

There are 2 paths for accessing on-board diagnostics. It is necessary to access information through both paths, as each path presents some different information.

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