Regal V6-231 3.8L Turbo VIN 8 4-bbl (1983)
Malfunction Indicator Lamp: Description and Operation
Computer Command Control (C-3) System
The instrument panel mounted ``Check Engine'' or ``Service Engine Soon'' lamp is used to alert the operator of malfunctions within the C-3
system.
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When the ignition is ON with the engine stopped, the lamp is illuminated as a bulb check.
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When the engine is running, the lamp will be illuminated whenever the ECM senses a system malfunction.
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In addition, the lamp is used to access trouble codes stored in the ECM trouble code memory.
