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 and Low Reference Bussing






MAF/IAT, MAP, and ECT Sensors






Heated Oxygen Sensors






Electronic Throttle Controls






Fuel Injectors and Fuel Pump Controls






EVAP Solenoids and FTP Sensor






Ignition Control Module






Camshaft, Crankshaft, Knock Sensors, and Camshaft Position Actuator Solenoid






Secondary Air Injection - NU3






Controlled/Monitored Subsystem References