Computer Reset UT400

[Homeowner A]

Best way to reset the computer?  Can I just disconnect the battery for a few or do I need to do something else?

[Greg Kilgore]

Just because your machine is a coleman it is made by Hisun. Just like the Massimo, (my) Axis, and others. The computer reset is the same.

Hisun uses the delphi MT05 ECU.

There is 2 ways. I like option 2.

And should always wait for fuel pump to build up pressure and kick off before attempting to start engine

Option 1 (From MotorCycleDoctor . Com) . Start machine. Leave it in park. Warm engine for at least 2 minuits. Hold throttle wide open for 5 seconds. The rev limiter will prevent it from blowing up the engine. Turn off engine for at least 15 seconds. Then start machine and allow the computer to re-learn the computer.

 

Option 2. Start with the machine off. Turn keyswitch to on. Make sure the fuel pumps kicks on. Then turn the key back off. Do the on off thing 5 times within 30 seconds. Make sure the fuel pump kicks on each time. Once the 5th time off, leave off 30 seconds.  Then start and allow computer to re-learn.

 

ECU-Reset-5.pdf

 

[Captain Bob]

What about when you have a "pulse-type" fuel pump (as I have on my Menard's Yard Machines Hisun Carburetor-fed HS-400)? The fuel pump doesn't do anything unless the engine is cranking and the engine is sucking fuel/air mixture.

[Greg Kilgore]

I'd still try the on/off cycle thing first.

If that doesn't work the full throttle thing is an option as long as the rev limiter works. You could try to put machine in reverse and see how fast it go backwards. My axis 500 will only do about 8 mph due to the rev limiter works on my Axis 500. If you're doesn't go above 10 or so, I'd guess 99% that the rev limiter works and your machine won't blow up. But again I can't be 100% sure. So do AT YOUR OWN RISK.

Check with others. Check on the motor cycle doctor website. There may be a contact number to call and ask an actual mechanic about it. He may charge for a phone consult. I don't know. But even if he does, it will be cheaper than replacing or rebuilding an engine.

Then post so others may be in the same situation.

Good luck.