2005-2008 Honda ATV TRX500FA/FGA Fourtrax, Rubicon Factory Service Manual, Page 510Get this manual
HONDAMATIC 6System Failure Reproduction Connect all connectorsTurn the ignition switch ONCheck the gear position indicatorIs problem code 12 indicated? NO No problem (Temporary failure) Erase the failure code (page 24-9) YES Faulty ECM After replacement, perform initial setting procedure (page 246) GEAR POSITION INDICATOR
PROBLEM CODE 13: MODE SELECT SWITCH SYSTEM (D1, D2 AND ESP)
1Mode Select Switch Connection Inspection Check for loose or poor contact on the ECM 21P (Black) connectorECM 21P (BLACK) CONNECTOR