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
If it fails: lemon-manuals.org.ua

Or, hide this message: temporarily or permanently

System Diagram




Engine Controls Schematics (LS9)

ECM Power, Ground, MIL, and Serial Data






5V Bus






Low Reference Bus






BARO, ECT, IAT 2, MAF/IAT, MAP, and Supercharger Air Inlet Pressure Sensors






Heated Oxygen Sensors






Electronic Throttle Controls






Fuel Injectors






Fuel Pump Controls






EVAP Solenoids, FTP Sensor, and Supercharger Bypass Valve Solenoid






Ignition Controls - Bank 1 (Odd) Ignition Coils






Ignition Controls - Bank 2 (Even) Ignition Coils






Ignition Controls - CKP, CMP, and Knock Sensors






Controlled/Monitored Subsystem References