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

System Diagram



Engine Controls Schematics

ECM Power, Ground, MIL, and Serial Data






5-Volt and Low Reference Bussing






MAP, ECT, and MAF/IAT Sensors






Heated Oxygen Sensors






Electronic Throttle Controls






Ignition Controls Bank 1 (Odd) Ignition Coils






Ignition Controls Bank 2 (EVEN) Ignition Coils






Ignition Controls, Knock, CMP, and CKP Sensors






Valve Lifter Oil Manifold (VLOM) Assembly






Fuel Injectors






Fuel Controls - Fuel Pump Flow Control






Fuel Controls - EVAP Controls and Manifold Tuning






Controlled/Monitored Subsystem References