Start button and fuel pump not working.

11122 Views 42 Replies 8 Participants Last post by cannedham, 26 d ago

Tormented_Commander

Discussion Starter · Sep 17, 2020

I drove my 2016 commander 2 days before this issue and it was running perfectly. Now when i try to start it i can't hear the fuel pump and when i push the button nothing happens. I have checked fuses and used a test light to make sure im getting power. I also checked battery and and ground wires. I don't have a dealer near me and prefer to fix it myself so any help would be greatly appreciated.

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Xommando

· #21 · Jun 25, 2021

Having this same issue right now. Was it ever solved?

Sand slinger

· #22 · Sep 22, 2021

Xommando said:
Having this same issue right now. Was it ever solved?

I'm having the same issue did you figure out what it was?

Billy.salmon

· #23 · Dec 27, 2021

I’m having the same issue. Any leads or thoughts that would help. Everything comes on and key registers but no fuel pump prime and no crank. Can get both pump and starter to work manually.

cannedham

· #24 · Dec 28, 2021

Billy.salmon said:
I’m having the same issue. Any leads or thoughts that would help. Everything comes on and key registers but no fuel pump prime and no crank. Can get both pump and starter to work manually.

What year Commander? Did you jump straight from battery to starter? If using start relay, did you you jump the main terminals or jump power to the relay coil? If using coil, did you also jumper the ground side of coil? With fuel pump, did you run a positive jumper only or a positive and a ground?

Billy.salmon

· #25 · Dec 28, 2021

cannedham said:
What year Commander? Did you jump straight from battery to starter? If using start relay, did you you jump the main terminals or jump power to the relay coil? If using coil, did you also jumper the ground side of coil? With fuel pump, did you run a positive jumper only or a positive and a ground?

2014 commander 800xt . Jumped the solenoid for the starter. Both big posts And Put ground to the fuel pump just to make sure they were both working. When you turn the key on the dash and everything comes on it acknowledges the performance key but will not start or prime.

cannedham

· #26 · Dec 28, 2021

The ECM switches the ground path to the start relay coil and the fuel pump. Assuming that you've verified 12 volts positive to the start relay coil, out of the start button when depressed, and to the fuel pump, the ECM may not be switching those circuits or has lost it's own ground connections. You could check both connectors on the ECM, and all the common ground connections. I believe there are 3 ground wires going from the ECM to somewhere(chassis ground point). There is one under the dash somewhere, one at the engine, and one somewhere towards the rear of machine. I would guess that last one to be near the rear of the tunnel where cab meets bed??

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Billy.salmon

· #27 · Dec 28, 2021

That’s what I was thinking. I know the start stitch is working and the brake switch is working. It would seem like there should be more lights that come on when the cluster turns on. Like a car the check engine light comes on be fore you start it. Also the starter solenoid has power on the battery side and on the bottom small blade connector. The top blade connector I’m assuming is pcm signal shows nothing like I’d assume just as well as the ground on the fuel pump. It’s looking like a pcm failure I just don’t know if I want to go down that route

cannedham

· #28 · Dec 28, 2021

Yeah, you're making it sound like the ECM isn't doing the wake up/self test thing. I know you've got the XT guages. When mine powers up, seems like all the indicators pop on, needles swing back and forth, rap music starts playin' (wtf?), etc.

Billy.salmon

· #29 · Dec 28, 2021

Definitely no needle swing or rap music on mine unfortunately lol and no other indicators besides sport or eco mode. I know I have a ground problem just don’t know if the ground from the ECM or the wiring ground are bad. I’ve replaced plenty of pcm/bcm/tcm for ground loss in cars but never a side by side. So I’ll dig into the wiring some more and of that dosnt work I’ll probably be buying a ecm. I appreciate your help I’ll update when I can

cannedham

· #30 · Dec 28, 2021

Is fuse F6 good? ECM power.

acefire

· #31 · Dec 28, 2021

If I'm not mistaken the ecm signal wire grounds through the ecm to engage the starter. When the ecm reads power it send that power to ground to complete the circuit to engage the starter. Not sure if the fuel pump grounds through the ecm or not.

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smoky03

· #32 · 2 mo ago (Edited)

hey there cannedham. i have a 2015 maverick 1000r xmr.
the machine quit getting fuel pressure, i rebuilt the fuel pump several times, seemed to work but i was mistaken so i replaced it with an oem fuel pump. seemed to work and than about 20 or so miles started again. it just starts shutting off. i installed a fuel pressure gauge. i put it aside for a bit. someone said change the tail lights that maybe it was thinking inwas riding the brakes, didnt work. changed ecu, didnt work changed cam shaft position sensor. changed one way bearing and am installing a new belt in a couple days, plugs and unplug, cleaned and de all plugs that i can find. checked all wiring for breaks, burns, scrapes. and im not able to find anything. i can rev it up to about 6-7k maybe and it will shut off power to fuel pump. turn key off and back on, fires up. i can baby it and itll go for a while but if i give it a little extra to pull up a hill or out of a hole, itll shut off. its shutting power to the fuel pump. i did manage to get a code at one point that said fuel pump short to ground but im not finding anything. and there is no fuel pump relay that i can find, i read that its in the ecu, thats why i changed it. sometimes itll just shut off just going.. im baffled. anyone have any suggestions? please help.
thanks

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cannedham

· #33 · 2 mo ago

Do you still have the pressure guage in? If so, is it holding 50psi steady? Are you certain that the pump is losing power? It sounds from your description that the pump is working, but maybe not providing enough pressure or flow under load. Are you having any other electrical issues? Any possibility the fuel tank isn't venting? Maybe an empty Cheetos bag swimming around in the gas tank?

It can happen.

smoky03

· #34 · 2 mo ago

thanks for the reply. it will sit here and idle all day, ive checked the vent line, and ran it without the cap. fuel tank is fresh new clean fuel. cleaned the tank when i pit the pump in. also when i put the oem tank in.
it does hold 50 psi pretty good, get up around 6-7 k and it barely goes down to maybe 48 for a split second when it stays running. when it shuts off the guage goes to 0 instantly and stays at 0 untilnreset key

cannedham

· #35 · 2 mo ago

Have you checked for your chassis grounds? I don't know where they are on the Mav, but on the Commander there is a common ground point close to the voltage regulator and an engine ground. The Commander schematic shows 3 ground wires leaving the ECU. They are crimped or soldered together in the wiring harness, then lead to chassis ground.

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smoky03

· #36 · 2 mo ago

i have not, im changing the belt this weekend, my neighbor was having a similar issue on a polaris 1000 but getting an engine light, change his belt and it seemed to fix.
i will change the belt and check and clean all grounds this weekend. i will be in touch. it may get into next week, weather permitting.
thank you.. talk soon!!

smoky03

· #37 · 28 d ago

smoky03 said:
i have not, im changing the belt this weekend, my neighbor was having a similar issue on a polaris 1000 but getting an engine light, change his belt and it seemed to fix.
i will change the belt and check and clean all grounds this weekend. i will be in touch. it may get into next week, weather permitting.
thank you.. talk soon!!

ok, checked and cleaned the grounds, cleand them on battrty, 3 on the side of the battery box were dirty but not bad
1 on the engine, drivers side under the shifter area. all i could find.
i actually thought that was it. also changed my belt. nothing is working. im not sure what to do next.
it runs, push the gas to the floor, fuel pressure drops to zero, turn off, back on and it fires right up. runs good unless hit gas hard or under heavier load. the hoter it gets the worse it gets.
im stumped.

cannedham

· #38 · 26 d ago

When you turn ignition on (without starting), does the fuel pump run for about 25 seconds and then stop? If so, does the pressure hold for a short time? I think that when it quits and you see the fuel pressure drop to zero, the pump has lost power some seconds earlier, and it is running under residual fuel pressure until it is no longer adequate. When it dies, does the instrument cluster do anything, go dark or flicker? Are you still running the original 5 amp fuel pump fuse? You mentioned earlier that you once got a "fuel pump short to ground" code. I wonder how the ECU makes that determination. Have you had any other voltage issues or the buggy been in water to the top of the roll cage?

smoky03

· #39 · 26 d ago

hi, thanks for your reply
no other electrical issues. still running 5amp fuse, tried a 20 but no change.
its been in water but not to top of roll cage, like up to the seats maybe.
no change on cluster when it dies.
its instant when it dies, fuel pressure drops to zero at the same time. or we can say fuel pressure drops to 0 than it dies. however we word that. lol
oh, and yes when i turn key on you can hear the fuel pump build pressure, its only about 5-8 seconds though than it stops once up to 55psi. it usually holds pressure pretty good. and of course once it starts the fuel pump turns on again. ive gotten to where i can hear it most of the time. you can put you have on fuel pump covet and feel when its on or off as well if just sitting still.
im taking the bypass out today or tomorrow ro see if its the high low bypass, im not sure of the exact name but the bypass that allows it to run in sport mode while in low. ive had that cause a no start issue before, cleaned and de’d it bit going to try and run it without that all together.
thanks again for replies!!

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acefire

· #40 · 26 d ago

Sport low mod won’t shut the engine off it just goes into limp mode if it goes bad. You will get a message on dash that’s scrolls transmission fault . Also if it’s working it will show it’s in high in high and in low range. If it’s bad the H will change to a E .

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