What's new
Honda Trail 125 Forum

Welcome to the Honda Trail 125 Forum! We are an enthusiast forum for the Trail 125, Hunter Cub, CT125 or whatever it's called in your country. Feel free to join up and help us build an information resources for this motorcycle. Register a free account today to become a member. Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members through your own private inbox!

Wireing diagram for 2021 ct 125.

SLO

Active member
Joined
Nov 26, 2021
Messages
382
Location
meadowview virginia
I will have to go back and look and see what all you did do. I got some info as to how to determine which wire is IAT wire. I haven't checked to see if it is correct,
but the procedure is to unhook plug at intake , and check ohms to ground on each pin of plug to ground when engine is cold. ( I presume with key off as it is an ohm test ) Record ohms measured at each pin. Start/ run bike to operating temperature. Shut off / measure ohms from each pin to ground again. The one with the most decrease in ohms is the IAT wire. That is on 5 pin plug harness on intake ,as there are two sensors on intake with one being a 4 pin plug wire to the ( MAF ) sensor? I am not what that is from schematic I am looking at. I found a 5 pin harness extension for a Honda civic that i believe is identical. Now if I can find identical harness extension for O2 sensor I will be able to install with out fudging with factory wiring. I a very particular about electrical connections as I do not want to be stranded due some SIMPLE PROBLEM.
 
Top