2006-2009 Honda TRX680 (TRX 680 FA-FGA) Factory Service Manual, Page 147Get this manual
FUEL SYSTEM (PGM-FI)
MIL CIRCUIT INSPECTION
If the engine can be started but the MIL does not
come on with the ignition switch ON and engine
FA model shown:
stop switch "0", check as follows:
Check the various functions of the combination meter- If they do not function, check the combination
meter power input line (page 23-8)If they function properly, check as follows:
Turn the ignition switch OFFDisconnect the peM 33P (Gray) connector