2005-2011 Honda FourTrax Foreman TRX500 FE/FPE/FM/FPM/TM Service Manual, Page 452Get this manual
LIGHTSMETERSSWITCHES INPUT VOLTAGE
Turn the ignition switch to ON and measure the input voltage between the Blackred and Green! blue terminal of the wire harness side connectorSTANDARD: 4.75.3 V
If the input voltage is out of specification, check for open or short circuit in the Blackred and Greenblue wires between the throttle position sensor and ECMIf the wires are OK, replace the ECM (page 19-81,
REPLACEMENT
Remove the fuel tank cover (page 3-5), Oisconnect the TP sensor connector (page 21-21)
Remove the two sensor screws, TP sensor and Dring