2005-2008 Honda ATV TRX500FA/FGA Fourtrax, Rubicon Factory Service Manual, Page 509Get this manual
HONDAMATIC 2Control Motor Power Input Line Inspection Turn the ignition switch OFFDisconnect the ECM 5P (Black) connectorTurn the ignition switch ONMeasure the voltage between the wire harness side connector terminal and groundConnection: Redyellow (+) Ground () RY Is the voltage 11V or above? NO Open in wire between the ECM and the battery YES GO TO STEP 3
3Control Motor Ground Line Inspection Disconnect the ECM 5P (Black) connectorCheck for continuity between the wire harness side connector terminal and groundConnection: Green (+) Ground () Is there continuity? NO Open in wire between the ECM and ground YES GO TO STEP 4G