2006 Honda TRX680 Rincon Factory Service Manual, Page 313Get this manual
DRIVETRAIN SYSTEM 3AT Clutch Pressure Control Solenoid Line Short Circuit Inspection Check for continuity between the AT clutch pressure control solenoid 2P (Black) connector terminals of the wire harness side and groundConnection: BlueredGround YellowredGround Is there continuity? YES NOShort circuit in the Bluered wire Short circuit in Yellowred wire- GO TO STEP 4AT CLUTCH PC SOLENOID 2P (BLACK) CONNECTOR (Wire side of female terminal)
4RecheckDTC Turn the ignition switch ON and test-ride the vehicle, then recheck the current DTCIs DTC 4-2 indicated? YES NOReplace the PCM with new one and recheck- Intermittent failure