Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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Malfunction Indicator Lamp: Description and Operation

The instrument panel mounted "Check Engine" lamp is used to alert the operator of malfunctions within the C3 system. When the ignition is on with the engine stopped, the lamp is illuminated as a bulb check. When the engine is running, the lamp will be illuminated whenever the ECM senses a system malfunction. In addition, the lamp is used to access trouble codes stored in the ECM trouble code memory.