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)

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OBD II Comprehensive Component Monitoring List of Components

California Air Resources Board (CARB) OBD-II Comprehensive Component Monitoring List of Components Intended to Illuminate MIL

IMPORTANT: Not all vehicles have these components:
^ Transmission Range (TR) mode pressure switch
^ Transmission turbine speed sensor (HI/LO)
^ Transmission vehicle speed sensor (HI/LO)
^ Ignition sensor (cam sync, diag)
^ Ignition sensor hi resolution (7x)
^ Knock Sensor (KS)
^ Engine Coolant Temperature (ECT) sensor
^ Intake Air Temperature (IAT) sensor
^ Throttle Position (TP) sensor A, B
^ Manifold Absolute Pressure (MAP) sensor
^ Mass Air Flow (MAF) sensor
^ Automatic transmission temperature sensor
^ Transmission Torque Converter Clutch (TCC) control solenoid
^ Transmission TCC enable solenoid
^ Transmission shift solenoid A
^ Transmission shift solenoid B
^ Transmission 3/2 shift solenoid
^ Ignition Control (IC) system
^ Idle Air Control (IAC) coil
^ Evaporative emission purge vacuum switch
^ Evaporative emission canister purge (EVAP canister purge)