2006 Honda TRX680 Rincon Factory Service Manual, Page 46Get this manual
TECHNICAL FEATURES
PCM (POWERTRAIN CONTROL MODULE)
The engine and drivetrain systems of this model are controlled by the PCM; the ECM (Engine Control Module) and TCM (Transmission Control Module) are integrated into the PCMThe PCM controls the following systems: Engine management systemPGM-FI systemIgnition systemCooling fan control system Drivetrain systemAT (Automatic Transmission) systemSelectable 4WD system