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)

Or, hide this message: temporarily or permanently

System Diagram




Engine Controls Schematics ((LFX))

Module Power, Ground, Serial Data, and MIL






5V1, and Low Reference Bus (1 of 3)






5V2, 5V3, and Low Reference Bus (2 of 3)






Low Reference Bus (3 of 3)





Engine Data Sensors - Pressure, Temperature, and Throttle Controls






Engine Data Sensors - Oxygen Sensors






Ignition Controls - Ignition Coils 1, 3, and 5






Ignition Controls - Ignition Coils 2, 4, and 6






Ignition Controls - Camshaft, Crankshaft and Knock Sensors, Camshaft Actuators





Fuel Controls - Fuel Injectors






Fuel Controls - Fuel Pump Controls





Fuel Controls - Evaporative Emission Controls





B+ Bus (1 of 2)

Controlled/Monitored Subsystem References