Operation CHARM: Car repair manuals for everyone.
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

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Dual Plug Inhibit System

PURPOSE
- A function of the Powertrain Control Module (PCM) that is used when the engine is first started.

OPERATION
- During engine cranking, the PCM will only fire the spark plugs on the right-hand side of the engine. When the engine has started, the PCM will start normal twin-plug operation.