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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CNG

When ignition switch is turned to the OFF position, the Powertrain Control Module (PCM) stops operating the fuel injectors, ignition coil, automatic shut-down (ASD) relay and CNG high-pressure fuel shut-off solenoid relay.

Fuel flow is electrically stopped (shut-down) at both the tow-pressure and high-pressure fuel shut-off solenoids.