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Offroad => Side By Side => Topic started by: ethridgem on April 02, 2019, 03:11:39 PM

Title: No power to fuel injector
Post by: ethridgem on April 02, 2019, 03:11:39 PM

Howdy all-

I've got a non-running 2013 UXV 500i SP that I picked up and am working on getting up and running. Right now, I'm not getting power to the fuel injector. I know there's plenty of battery power, the relay is good, the fuse is good, and the injector is good (I was able to manually energize the injector and get it to spray fuel everywhere).

Any thoughts?

TIA

Title: Re: No power to fuel injector
Post by: aaron8 on April 02, 2019, 03:37:56 PM

Set the multimeter to read DC voltage (DCV).

Turn the ignition switch to the ON position.

Measure the input voltage on the harness side of the connector. Touch one meter lead to the input hot wire terminal and the other to a ground.

The voltage can only be measured within 3 seconds of the ignition switch being turned on. The battery voltage should show.

If the voltage is not in specification there is a short or open circuit in the wire.

If the voltage is in specification, but the malfunction code doesn’t go away, there is a problem with the ECM connector or the ECM.

Title: Re: No power to fuel injector
Post by: ethridgem on April 02, 2019, 08:24:04 PM

Ok, got the injector working. I believe it was working correctly to begin with, but I didn't realize the power on the harness side would come in pulses.

Now, there's no bang. We've got fuel, spark, and air...but no combustion.

Is a compression test the next thing on my list?

Title: Re: No power to fuel injector
Post by: CROSSBOLT on April 02, 2019, 08:43:48 PM

Yes.

Title: Re: No power to fuel injector
Post by: ethridgem on April 02, 2019, 08:49:39 PM

That's what I thought. Thanks.

What kind of reading should I be getting on a compression test on these motors?

Title: Re: No power to fuel injector
Post by: CROSSBOLT on April 02, 2019, 10:13:47 PM

Anything in excess of 130 psi when cranked briskly with starter. That is a general rule number. Do not know if Kymco even specifies. It would probably be wrong if it was in the service manual, anyway!

Title: Re: No power to fuel injector
Post by: aaron8 on April 03, 2019, 11:56:43 AM

compression should be 180+ I would check timing on the engine. Ive seen numerous chain tensioners bust and the engine jump time.

Title: Re: No power to fuel injector
Post by: ethridgem on April 03, 2019, 03:52:23 PM

Did a compression test last night. ZERO reading. Which leads me to my next question: is there an compression release on these motors?

Title: Re: No power to fuel injector
Post by: airshot on April 03, 2019, 06:23:58 PM

To the best of my knowleddge no comp release, even if there was, it would only lower it not make it 0....time to start taking things apart...just a thought here, are you sure tyour comp gage is good?  Put your finger in the hole just to be sure

Title: Re: No power to fuel injector
Post by: aaron8 on April 04, 2019, 12:00:21 AM

Quote from: ethridgem on April 03, 2019, 03:52:23 PM

Did a compression test last night. ZERO reading. Which leads me to my next question: is there an compression release on these motors?

yes, there is a compression release. pull off valve cover and check valve clearance and timing. hard to believe it shows 0 psi. sounds like a bad gauge. or no piston   ;D