2000-2003 Honda TRX350 Rancher factory service manual, Page 344Get this manual
ELECTRIC SHIFT PROGRAM (ESP) Problem Code 5: ECU Motor Driver Circuit Check the connections of the ECU, motor and related circuitAbnormal Loose or poor contact of related circuits
Disconnect the ECU connector (5PBrown)Measure the voltage between the RedYellow terminal and body ground
Abnormal
Loose or poor contact of related circuits Blown fuse Open circuit in RedYellow wire
CONNECTION: RedYellow(STANDARD: 11 minimum
Body ground
Check for continuity between the Green terminal and body ground