2005-2006 Honda ATV TRX500FE/FM/TM FourTrax Foreman Factory Service Manual, Page 45Get this manual
TECHNICAL FEATURES
INTEGRATED ENGINE CONTROL MODULE (ECM)
The ignition control module (ICM), electric shift program (ESP) control unit (FE model only), fan control unit and 2WD4WD control unit (FMFE models) are integrated into the ECM to reduce cost and conserve space