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2004 sportster 150 tach not working
- Thread starter Jojorico
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BMANN06
Well-Known Member
Is everything else working in the dash except the tach? I pretty sure with the 04's you wouldn't need to "marry" the dash with the ECU as you have to in the newer models. Search RFosters threads you'll find one about sending your tachs to the manufacture for refurbishment I recall it was really cheap.
The fuel gauge is stuck on full also. The tack & fuel never moves when you install the key. They don't need to be marry I tried. I have a candoo.
2004. I also put the original 155hp on just to see if it would work the gauges. Didn't help
RXP....on the boat it's not really a cluster it's all Individual gauges. I'm wondering if its the MPEM for the gauges that is bad.
No faults codes. All fuses are good
devonte007
Active Member
I have had an issue with my tach over the last couple of years too. My tach still works but occasionally will read about 2000 rpm's too high. All I need to do is tap on it a few good times and is comes back down to normal. I assume my problem is probably in the wiring, maybe a bad ground.
Sounds like your problem is a bit more involved. As I recall, when you insert the lanyard the mph and tach each reset and go from 0 to the max and then back down. I assume that the gauges get a voltage spike when this happens which makes the needles go to max and back down. This should be measurable if you connect a voltage gauge to the wires in back. You should be able to determine if it is a bad /non-existant signal from the ecu or if your gauges are fried using this method. You can also take the individual gauges out and just hook up some voltage leads to the back posts and see if anything moves.
One thing to check, do the backlights come on when you turn on the boat lights? If that is also not working it may be just a wiring issue and/or fuses. Since they are both out, it indicates a problem further back in the system. I wonder if they got fried by some kind of electrical spike or something, taking them out and testing them individually should confirm this.
If in fact the gauges are no good, then you will need to replace them obviously. I have always wondered if you can install readily available aftermarket mph and tach, since the seadoo ones are outrageous. I have never heard of such a thing on these posts yet, but would like to know if anyone has done this. I can't imagine universal gauges working that differently from the OEM versions, but who knows.
Have you checked any troubleshooting procedures in the shop manual? It might help track down the source of the problem. Electrical gremlins can be a real chore, best thing is to start downstream and just methodically work your way up until you find the issue.
One last thing, you mentioned you have a candoo scanner... is there a way to hook that up and see all the readings from the engine? In other words, can you see what the ecu is seeing as far as mph/rpm/fuel level on the computer screen as the boat is running? If you can, then it probably is not the ECU. In fact, I would guess that the engine would not even run good if you had a bad rpm sender or the ecu could not read rpm. I would be the problem lies somewhere between the ECU and the gauges.
Good luck and let us know what you find, wish I could help more.
Sounds like your problem is a bit more involved. As I recall, when you insert the lanyard the mph and tach each reset and go from 0 to the max and then back down. I assume that the gauges get a voltage spike when this happens which makes the needles go to max and back down. This should be measurable if you connect a voltage gauge to the wires in back. You should be able to determine if it is a bad /non-existant signal from the ecu or if your gauges are fried using this method. You can also take the individual gauges out and just hook up some voltage leads to the back posts and see if anything moves.
One thing to check, do the backlights come on when you turn on the boat lights? If that is also not working it may be just a wiring issue and/or fuses. Since they are both out, it indicates a problem further back in the system. I wonder if they got fried by some kind of electrical spike or something, taking them out and testing them individually should confirm this.
If in fact the gauges are no good, then you will need to replace them obviously. I have always wondered if you can install readily available aftermarket mph and tach, since the seadoo ones are outrageous. I have never heard of such a thing on these posts yet, but would like to know if anyone has done this. I can't imagine universal gauges working that differently from the OEM versions, but who knows.
Have you checked any troubleshooting procedures in the shop manual? It might help track down the source of the problem. Electrical gremlins can be a real chore, best thing is to start downstream and just methodically work your way up until you find the issue.
One last thing, you mentioned you have a candoo scanner... is there a way to hook that up and see all the readings from the engine? In other words, can you see what the ecu is seeing as far as mph/rpm/fuel level on the computer screen as the boat is running? If you can, then it probably is not the ECU. In fact, I would guess that the engine would not even run good if you had a bad rpm sender or the ecu could not read rpm. I would be the problem lies somewhere between the ECU and the gauges.
Good luck and let us know what you find, wish I could help more.
Faria instruments makes most gauges for sea doo. They will rebuild them with a 3 year warranty for like 30-50 each.
http://www.faria-instruments.com
http://www.faria-instruments.com
Just got on faria looks like the tach is $100 and fuel $50 is that right?
BMANN06
Well-Known Member
I'm still thinking you have two problems.
1) possible faulty gauge
2) compatibility issue with an 04 rxp Ecu working with an 04 sportster dash.
Don't want to come across as buzz killington here but you can't just mix n match ecus (trust me I've tried). I'm confident that you'll end up with a machine that runs but I'm thinking your going to need to spend some time reviewing wiring schematics to get the dash and dummy lights functional.
1) possible faulty gauge
2) compatibility issue with an 04 rxp Ecu working with an 04 sportster dash.
Don't want to come across as buzz killington here but you can't just mix n match ecus (trust me I've tried). I'm confident that you'll end up with a machine that runs but I'm thinking your going to need to spend some time reviewing wiring schematics to get the dash and dummy lights functional.
You could be right but I know those 2 gauges are dead. All dummy light & dash lights work and speedo is working. The 04 & 05 ECU are the same just different mapping. The 03 and back is totally different. 06 is it's own self and marry to gauge with MPEM....07 and newer is marry to gauge no MPEM. Thanks
devonte007
Active Member
Rfoster,
Thanks for the tip about Faria, did not know they were the manufacturer for Seadoo and also did not know they will repair broken gauges for a reasonable cost. Great tip and I'm sure many of us will benefit from it!
I bought my boat with the gauges not working. My tachometer gauge was stuck in 500 rpms. I only send tachometer to Faria first to see if they can fix it before I would send the remaining. About 3 weeks ago i got it back for like $47 including shipping looking like new. Now, when I turn the DESS key on the Tach goes all the way to the end of the rmps and back down. I just called them today to send them my fuel gauge and speedometer and was told the prices went up last week. Speedometer repair went from $65 to $100 and fuel gauge from $18 to $50. Not too happy about that. The fuel gauge if I recall comes with a wire plug. Can anyone confirm if that's a custom fit or other fuel gauges could be used ?
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