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

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

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Fuel Pressure Sensor

Display shows voltage from 0.0 to 5.0 and pressure from 0 to 4064 psi. This display indicates the CNG fuel tank pressure. The AF ECU monitors the fuel pressure sensor and the fuel temperature sensor in order to calculate the correct CNG fuel level remaining in the tank.