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 (LS7)

ECM Power, Ground, MIL, and Serial Data






5V1, 5V2, and Low Reference Bus (1 of 2)






Low Reference Bus (2 of 2)






ECT, MAF/IAT, and MAP Sensors






Heated Oxygen Sensors






Electronic Throttle Controls






Ignition Controls- Bank 1 (Odd) Ignition Coils






Ignition Controls- Bank 2 (Even) Ignition Coils






Ignition Controls- CMP, CKP, and Knock Sensors






Fuel Injectors






EVAP Solenoids, FTP Sensor, and Fuel Pump Controls





G302, G401, and G402

Controlled/Monitored Subsystem References