2005-2008 Honda ATV TRX500FA/FGA Fourtrax, Rubicon Factory Service Manual, Page 512Get this manual
HONDAMATIC PROBLEM INDICATED (MODE 1), BUT NO CODE IS RETRIEVABLE Gear position indicator blinks indicating problem, but the problem code is not displayed by the retrieval procedure: 1Automatic Transmission Inspection Check the automatic transmission shift performanceNote the position of the mode select switch at the time the automatic transmission does not shift"D1" or "D2"Perform troubleshooting of problem code (gear position switch system) (page 24-16)"ESP" GO TO STEP 2MODE SELECT SWITCH
2System Failure Reproduction Turn the ignition switch ONCheck the gear position indicatorIs there the gear position (D, L, N, R) indication? NO Perform troubleshooting of problem code (gear position switch system) (page 24-16) YES Perform troubleshooting of problem code (ESP shift switch system) (page 24-27) GEAR POSITION INDICATOR