TheFix

I am working on a 2017 Cub Cadet Challenger 750. I picked this unit up from the customer because it was running badly. When I got it to my shop it would not run at all. It did not have spark and the fuel pump was not priming, meaning that when I turn the ignition to on position, you could not hear the fuel pump running to prime the fuel system. I replaced the fuel pump and the fuse box containing the fuel pump relay, which is not a replaceable relay. When that did not work I ended up looking at the ECU controller under the seat. When I pulled the black and gray harness off of the ECU, I noticed corrosion. Had I noticed this before I did anything else it would have solved my problem immediately. The way that that harness plugs into the ECU is upside down and allows water to collect in the plug itself. One of the pins from the ECU was even broken off in the harness itself. I cleaned out the harness and got the broken pin out, plugged in the new ECU controller and the machine fired right up. I hope this saves some people out there a lot of trouble when diagnosing their unit. Always unplug your harnesses and check the pins condition. Another pointer is don't buy one of these Chinese knockoff UTV's.