2000-2003 Honda TRX350 Rancher factory service manual, Page 345Get this manual
ELECTRIC SHIFT PROGRAM (ESP) Connect fully charged battery to the motor 2P connector terminalsDoes not turn Faulty motor
Motor turns
Check the ES system failure (the gear indicator blinks) when turning the ignition switch from OFF'' to ON''
Replace the ECU with new one and troubleshoot again
No blinks No problem (temporary failure)
Problem Code 6: ECU Fail-Safe Circuit or Problem Code 7: ECU Voltage Convert Circuit