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 logical successor to CHARM, I recommend you try it!

Link: lemon-manuals.la

Electrical Diagrams



Engine Controls Schematics

Power, Ground, Serial Data, and MIL






Engine Data Sensors - 5-Volt and Low Reference Bus






Engine Data Sensors - Pressure and Temperature






Engine Data Sensors - Heated Oxygen Sensors






Engine Data Sensors - Throttle Controls






Ignition Controls - Ignition Coils






Ignition Controls - Sensors






Fuel Controls - Fuel Injectors






Fuel Controls - EVAP Controls






Fuel Controls - Fuel Pump Controls






Device Controls - Secondary Air Injection (K18)






Controlled/Monitored Subsystem References