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Home >> Chevrolet >> 2002 >> Express 1 Ton Van V8-6.5L DSL Turbo VIN F >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Description and Operation >> Powertrain Control Module >> Powertrain Control Module (PCM) Description >> The Diagnostic Executive
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The Diagnostic Executive

The diagnostic executive is a unique segment of software which is designed to coordinate and prioritize the diagnostic procedures as well as define the protocol for recording and displaying their results. The main responsibilities of the diagnostic executive are:
^ To monitor the diagnostic test enabling conditions
^ To request the malfunction indicator lamp (MIL)
^ To illuminate the MIL
^ To record pending, current, and history DTCs
^ To store and erase the Freeze Frame data
^ To monitor and record the Test Status information
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