1998-2004 Honda Foreman 450 factory service manual, Page 430Get this manual
ELECTRIC SHIFT PROGRAM (ESP) Problem Code 1: ECU (writing and recording circuit) Delete the problem code numberCheck the ES system failure (the gear indicator blinks) when turning the ignition switch fromOFF" to "ON" Blinks Replace the ECU with new one and troubleshoot again
I No blinks
No problem (temporary failure)
Problem Code 2: ES Shift Switch System (Up And Down)
Check the connectons of the ECU, gear shift switch and related circuitNormal Disconnect the ECU connector (22PBlue)Check for continuity at the wire harness side connector while pushing the shift switches up or downAbnormal Check for mud or water in the left handlebar switch housingNormal Abnormal Loose or poor connections in related circuit
Abnormal
Clean the left handlebar switch housing Disconnect the left handlebar switch connectorCheck for continu ity while pushing the shift switches up or down CONNECTION: Shift up switch: Blacklight blue (+) WhiteBlue (-) Shift down switch: Blacklight blue (+) WhiteYellow (-) STANDARD: Continuity Normal Abormal Replace the left handlebar switch Normal