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

ECM Power, Ground, MIL, and Serial Data






5-Volt Reference Bussing






Low Reference Bussing






IAT/MAF, MAP, ECT Sensors, VSS, and Stop Lamp Signals






Heated Oxygen Sensors






Electronic Throttle Controls






Fuel Injectors and Fuel Pump Controls






EVAP Solenoids and FTP Sensor






Ignition Controls Bank 1 (Odd) Ignition Coils






Ignition Controls Bank 2 (Even) Ignition Coils






Ignition Controls - CMP, CKP, and KS Sensors






Controlled/Monitored Subsystem References