2000-2003 Honda TRX350 Rancher factory service manual, Page 343Get this manual
ELECTRIC SHIFT PROGRAM (ESP) Problem Codes or 12: Gear Position Switch System Check the connections of the ECU, gear position switch and related circuitAbnormal Loose or poor contact of related circuit
Turn the ignition switch to OFF''Disconnect the ECU connector (22PBrown)Check for continuity at the ECU connector of the wire harness side as follows: CONNECTIONS: Light greenRed) Body Ground), when shifting to neutral WhiteGreen) Body Ground), when shifting to 1st gear PinkBlue) Body Ground), when shifting to 2nd gear BlueWhite) Body Ground), when shifting to 3rd gear YellowOrange) Body Ground), when shifting to 4th gear Light BlueWhite) Body Ground), when shifting to 5th gear Gray) Body Ground), when shifting to reverse STANDARD: Continuity
Abnormal
Disconnect the gear position switch connector (8P)Check for the continuity at the gear position switch connector as follows: CONNECTIONS: Light greenRed) Body Ground), when shifting to neutral WhiteGreen) Body Ground), when shifting to 1st gear WhiteRed) Body Ground), when shifting to 2nd gear Blue) Body Ground), when shifting to 3rd gear Yellow) Body Ground), when shifting to 4th gear Light BlueWhite) Body Ground), when shifting to 5th gear Gray) Body Ground), when shifting to reverse STANDARD: Continuity