2015 Massimo 550 Throttle Position Sensor issue

[TexAcoon]

I'm looking to purchase a 2015 Massimo 550 that might have an issue with it's throttle position sensor.   

From the fella selling this UTV, he claims its to set the idle on fuel injection because the engine will not stay idle or when it starts sometimes it idles too high.

My Question if anyone had any issues with their Massimo 550 and if it was actually the TPS or something else that would allow the machine to idle correctly.

Thanks!

 

[Mark Bruce]

On 12/16/2024 at 3:54 PM, TexAcoon said:

I'm looking to purchase a 2015 Massimo 550 that might have an issue with it's throttle position sensor.   

From the fella selling this UTV, he claims its to set the idle on fuel injection because the engine will not stay idle or when it starts sometimes it idles too high.

My Question if anyone had any issues with their Massimo 550 and if it was actually the TPS or something else that would allow the machine to idle correctly.

Thanks!

 

7

[Mark Bruce]

Hi I am curious to find out what you end up with I have a Coleman 550 which as I understand is basically the same engine and I have the same problem but I've been told it's the injector which I've changed 3 or 4 times now, sometimes it helps and sometimes it doesn't. Thanks 

[Jack Angel]

The TPS does control idle, but other items can cause idle issues, such as a vacuum leak, carbon on the throttle plate and even a timing issue. Unfortunately Massimo doesn't produce detailed trouble shooting information on their UTV's. 

[TexAcoon]

Hi Mark ..

Well things ended up changing ...  I went and took a look at it and decided it was a bit smaller than I wanted.   So I ended up buying a Kawasaki Mule 4x4 Trans 4010 ..   with desiel ...  bought it on auction and know it needs some work..  One of those deals you see the pictures but have not physically seen it in person ...  So it should be interesting when I pick it up.

[TexAcoon]

Thanks Jack ...   YUP! I was looking into a manual on it but nothing could be located that I could find..

[that guy from Canada]

On 12/20/2024 at 8:13 PM, Jack Angel said:

The TPS does control idle, but other items can cause idle issues, such as a vacuum leak, carbon on the throttle plate and even a timing issue. Unfortunately Massimo doesn't produce detailed trouble shooting information on their UTV's. 

All true.

However TPS can cause a lot if problem especially if someone touched it,  it has that paint on the screw for a reason.

Done many tps, requires expensive probes or y harness to check finite voltage while running... not just static ohm tests work.

A poor battery or voltage regulator can cause the same problems...

If it's EFI and yr boosting it to start it it won't run right.... period. Start simple.

 

[that guy from Canada]

Adding to that I've bought tps that won't set in range if motion brand new.... aftermarket crap, cleaned n reinstall original reset, fine... 🙃

 

[Savage3]

1 hour ago, that guy from Canada said:

All true.

However TPS can cause a lot if problem especially if someone touched it,  it has that paint on the screw for a reason.

Done many tps, requires expensive probes or y harness to check finite voltage while running... not just static ohm tests work.

A poor battery or voltage regulator can cause the same problems...

If it's EFI and yr boosting it to start it it won't run right.... period. Start simple.

 

The tps should be a 5v reference. The voltage will range from .5 to 4.5v when slowly opening and closing the throttle with key on. (Check manual for specific model and voltage reference)

Black probe to ground and red probe to signal wire.

No need for static resistance testing, dynamic testing will reveal the problem.

Hope this helps...

[TexAcoon]

Thanks guys! .... I purchased a Kaw Mule instead of the 2015 Massimo 550 - but sure this helped someone else with a TPS issue.

Thanks again for all the help!