Help with constant new code rabbithole - Polaris RZR Forum - RZR Forums.net
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post #1 of 11 Old September 11th, 2019, 08:50 PM Thread Starter
 
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Help with constant new code rabbithole

2015 xp4 1000cc with 3k miles on it

Here's what I've been chasing:

- Get the 105-3 code for the TMAP; bought a new wiring harness and plug for it and the 105-3 goes away.

- At the same time the computer clears the 105-3, I get a 3056-2 code for the first time. This points to an 02 sensor issue.

- Buy new 02 sensor and install it. 3056-2 code goes away.

- Drive the UTV around for 10 minutes and all of a sudden get a 520344 17 code which is something for 'adaptive fuel correction'. While driving it seemed like it lost some power and then has a horrible idle that was revving by itself at times. That seems to have gone away but still has a bit of a rough idle and the check engine light.

I'm stuck on this one. And why do I get one code, fix it, instantly get a new code I've never gotten before, fix it, rinse/repeat?

So far I've already:

Changed spark plugs
Changed out the TMAP sensor and pigtail
Installed a new O2 sensor
Opened up my fuel pump to make sure the o ring was seating right
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post #2 of 11 Old September 12th, 2019, 07:18 AM
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Re: Help with constant new code rabbithole

520344 17 - Lean Fuel, usually the Fuel Pump has low pressure
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post #3 of 11 Old September 12th, 2019, 08:21 AM
 
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Re: Help with constant new code rabbithole

There is no detection or code for low fuel pressure or pump going bad . So if your pump is going bad it may be why it was throwing the other codes you seen
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post #4 of 11 Old September 12th, 2019, 08:47 AM
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Re: Help with constant new code rabbithole

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Originally Posted by Max H View Post
There is no detection or code for low fuel pressure or pump going bad . So if your pump is going bad it may be why it was throwing the other codes you seen
This.

Fuel pressure is (oddly) one of very few things taken for granted by the ECU, so if you have a fuel pressure issue, the only codes or behaviors you will be alerted to are the effects of erratic or incorrect fuel pressure, not the root cause itself. Incorrect fuel pressure can cause almost any issue you can think of, from erratic manifold vacuum (TMAP) to a Lean or rich condition (o2, lean / rich codes), to power loss, fouled spark plugs, detonation, backfiring...etc etc. In your case, I would highly suspect the fuel pump as well.

Electric fuel pumps don't always just "fail" and not work, heat, age, voltage, and various other things can cause erratic behavior in the pump, and lead to many of these issues.
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Help me get some info in these threads: Tire Height --- Front Diff
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post #5 of 11 Old September 12th, 2019, 11:36 AM Thread Starter
 
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Re: Help with constant new code rabbithole

Didn't even think about the fuel pump this time around as its brand new. Ordered a Quantum after the Polaris pump started making a whining noise the entire time.

What are the chances of the pump going bad after a very short time/being bad out of the box?
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post #6 of 11 Old September 12th, 2019, 11:43 AM
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Re: Help with constant new code rabbithole

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Originally Posted by Th3German View Post
Didn't even think about the fuel pump this time around as its brand new. Ordered a Quantum after the Polaris pump started making a whining noise the entire time.

What are the chances of the pump going bad after a very short time/being bad out of the box?
Probably higher than you'd think....but it could also be the regulator if those have one on the fuel rail

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post #7 of 11 Old September 12th, 2019, 11:45 AM
 
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Re: Help with constant new code rabbithole

Quote:
Originally Posted by Th3German View Post
Didn't even think about the fuel pump this time around as its brand new. Ordered a Quantum after the Polaris pump started making a whining noise the entire time.

What are the chances of the pump going bad after a very short time/being bad out of the box?
If you google search Quantum fuel pumps RZR forums you will get some good info . Many have had good luck and several had issues. The only way to be sure is to hook up a fuel gauge and check it under load.
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post #8 of 11 Old September 20th, 2019, 05:38 PM Thread Starter
 
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Re: Help with constant new code rabbithole

So wanted to update; we did a fuel pump test and the pump is at 55 PSI.

Not being the fuel pump, what can this be?

Already changed out TMAP sensor and pigtail, O2 sensor, fuel pump, spark plugs, verified stator was at 12.5V.......kind of sick of throwing parts at it.

Almost think this has to be an injector.

Ideas?

Last edited by Th3German; September 20th, 2019 at 05:48 PM.
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post #9 of 11 Old September 20th, 2019, 05:59 PM
 
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I've heard that the injector pigtail can have a wire work loose inside the connector. I guess a replacement pigtail can be bought at the auto parts store. It may be something to try before replacing injectors
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post #10 of 11 Old September 20th, 2019, 06:03 PM
 
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post #11 of 11 Old September 21st, 2019, 12:40 PM Thread Starter
 
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Re: Help with constant new code rabbithole

So tried messing with the injectors, pulled the plug on either and the machine wont even turn over. I'm doubting now its injector related.

From searching online with this, I saw a few places mention chasing codes (not exactly the same as Ive been) and it ending up being either the main wiring harness itself or the ECU was acting up.

2 questions for that:

Is there a way to test if it is the wiring harness other than taking it off and putting a new one on?

Is there a place to send your ECU to to have it tested and re-flashed? And does reflashing 'fix' issues or what exactly is it?

Trying to find somewhere that could test it that I could send it to as my local dealer here is basically 'drop it off and we ll call you in a month or two when we look at it' so I'm just avoiding them as much as I can.
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