1997-2004 Honda Fourtrax Recon TRX250TE/TM Service Manual, Page 343Get this manual
ELECTRIC SHIFT PROGRAM (After 2001TE model) Problem Code 10: Ignition Pulse Generator System Check the connection of the ECU, ignition pulse generator and related circuitr-Abnormal Loose or poor contact of related circuit
Check the connections of the ground cables
Abnormal Loose or poor contact of ground cable(s)
Disconnect the ECU connector (22PBlack) and pulse generator connector (2PjCheck for continuity in the Blueyeitow wire between the ECU and pulse generator connector
No continuity- Open circuit in BluelYeliow wire Loose or poor contact of related circuit