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

Electrical Diagrams



Engine Controls Schematics

ECM Power, DLC, Ground, and MIL






Engine Data Sensors - 5-Volt Reference Bus






Engine Data Sensors - Low Reference Bus






Engine Data Sensors - ECT, HO2S and MAF/IAT Sensors






Engine Data Sensors - Oxygen Sensors






Engine Data Sensors - Electronic Throttle Controls






Ignition Controls - Bank 1 Ignition Coils






Ignition Controls - Bank 2 Ignition Coils






Ignition Controls - CMP Sensors and Solenoids






Ignition Controls - CKP Sensor and Knock Sensors






Fuel Controls - Fuel Injectors, Fuel Rail Pressure Sensor and High Pressure Fuel Pump Actuator






Fuel Controls - Low Pressure Fuel Pump






Fuel Controls - EVAP Controls






Controlled/Monitored Subsystem References