Wednesday, October 13, 2010

Honda TRX 420 Rancher

Today I have a 2008 Honda 420 Rancher in the shop.  It has an electrical problem, as soon as the key is turned on the ignition fuse blows.  The cooling fan also runs all the time.

I had to strip off the racks and fenders to get at all the wiring.  The machine is in pretty good shape.  There is no obvious signs of damage or abuse anywhere.  I unplugged everything that I could think of from the main wiring harness, put a new fuse in and started plugging things back in and checking the fuse. Everything seemed ok. The last thing that I plugged in was the ECM (engine control module, the black box that runs the fuel injection and ignition).  As soon as it was plugged in the fuse blew and the fan came on.  That of coarse leaves me wondering if the ECM is the bad part? 

I am going to look around for another used ECM  and see if that fixes things.

I found a used ECM and that solved the problem.  Total time in the shop, 3 hours.  Most of that was taking the racks and fenders off to get access to the wiring.

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