2005-2008 Honda ATV TRX500FA/FGA Fourtrax, Rubicon Factory Service Manual, Page 514Get this manual

HONDAMATIC 4Mode Select Switch Line Inspection Turn the ignition switch OFFDisconnect the ECM 21P (Black) connector Check for continuity ECM 21P (Black) connector terminals of the wire harness side with the mode select switch in each mode position
ECM 21P (BLACK) CONNECTOR

Is there normal continuity? NO YES Replace the mode select switch GO TO STEP 4

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