92 240sx RPM gauge prob...

[lebgangstah]

Hey guys new to this fourm..so a few days ago i got my rpm gauge to work but! for some reason this happens i made a short vid listen to when i rev the car and what happens when i dont , but still happens when i rev it after words THANKS.!
http://www.youtube.com/watch?v=viaPit2m ... ture=g-all

[Hijacker]

USDM car with a JDM cluster? Usually only a mismatch of tach to pulse type will cause that. What motor do you have in your car? JDM tachs work with DOHC KAs.

[lebgangstah]

i got a ka24de , and so what ur saying is thats the right cluster or wrong ? cuz it seems like its working fine then randomly when the fuel pumps on! the gauge goes crazy..

[Hijacker]

You can swap the tach into your old cluster and see if it works properly. I'm currently using a JDM tach in my USDM cluster with no issues. There should be no differences between the clusters as I have both and have compared the circuit boards of both. The only major differences revolve around the dummy lights being slightly different.

My major guess as to the issue is that you have a short somewhere on your tach signal wire. It's a Yellow/Red wire, and you can trace it back to the ECU, then to the EFI harness going back to the ignition coil and resistor pack.

[lebgangstah]

how do i find out if my cluster is USDM CLUSTER or JDM CLUSTER? and also i took out my cluster the back of it has no shorts , but that yellow/red wire is it the yellow with the red stripe? , someone told me to try this aswell ..

"Run an 8gauge wire from the block or intake manifold to the firewall or frame if you haven't so far. If the chassis isn't grounded right gauges go nuts for some reason. My temp gauge turned into my tach and this fixed it" and the prob also is that the rpm gauge never used to work untill i pulled out my batterie so i can try nd fix my fuse box cuz its very loose and basicly need a new one when i put it back in my car wouldnt start i shook the fuse box and it started 0_o . also when i redline the car it dosnt sound normal sounds like it wants to die out..

[lebgangstah]

also my fuse box is moveing around alot waiting on a new one when it gets warm here , but heres how it looks , idk if anythings missing in it but.. u guys can tell me thanks.

[compactfean]

Your speedo is In kph right? Jdm. As for the signal, the fuse box has nothing to do with it. It goes from your ecu to your cluster through the dash harness. id try running its own wire and it that doesn't work id say the tach is malfunctioning.

[lebgangstah]

okay so the KPH is jdm should i buy a usdm one or? , i got 2 clusters like this soo idk , im just trying to figure out why its going nuts if its just the tacho itsself i can replace it with the other one , but like u said so if i wanted to just lead a wire form the ecu to it how would i do this , cut the yellow, with red stripes on it and lead a new wire to the harness or? AND the reason why i posted the fuse box is cuz when i tryed putting it back together my car wouldnt start! i shook it and my rpm gauge nd car started to work 0_o

[Hijacker]

Double check the screws on the back of the tach aren't loose. And didn't Canadian models come with KPH speedos? I thought you guys liked the metric system up there.

It's rare for a tach to break. I've seen it happen on S14s, but rarely on S13s. If you have an extra cluster, why haven't you swapped in the pieces from that to eliminate the equipment currently installed?

[lebgangstah]

already did iv been switching things from both , both clusters i got are like that and canada has the km/h , but im not getting why its doing that so im gonna try my other RPM gauge and find out , and the screw i did hand tight there in there good , and ionly tryed this one but as soon as i get my car keys back ill go try it out but if it dosnt work should i rewire the yellow with red striped wire from the ecu to the cluster harness? or is there anyother wires that will neeed to be rewired aswell ,

[lebgangstah]

Alrightt was playing around with my car and found something beside my batterie its a white kind of box ill take a pic tom PROBLOM IS , its tapped and looks like its in bad condition anyone no what im talking about? it has a yellow with redwire aswell in it , also when i unplugged my battery , my rpm gauge maxed out and stopped working anymore? im gonna start takeing out the speedo tom tho and try nd swaping it..

[compactfean]

This why I recommend running a wire from ecu straight to the cluster., bypass what ever jank wiring that was done before.

[lebgangstah]

thats what im going 2 do , but needa no if thats the only wire? i need to run ?? or is there anyothers

[compactfean]

For the tach, thats it. It uses a common ground for one screw, a common power source for the other screw and then the signal is just the one wire. From ecu aaaalllll the way to the cluster by itself.

[lebgangstah]

alright sounds good im gonna start on this tom but one more quick question i heard there was 2 yellow, with red striped wires on the ecu ? wich one do i use or dose it not matter? btw thanks for the helps man

[compactfean]

That is true. Its pin number 2 on your ecu pinout.

[lebgangstah]

alright thanks for the help im gonna check it out and see what happens ,

[lebgangstah]

FINALLLYY FIXEDD!! ,
step 1 : found the yellow/red stripe wire on the back of the cluster
step 2 : found the yellow/red stripe wire on the ECU
step 3 : spliced the outer plastic on the wire and just attached the other wire i didnt cut it, cuz it didnt seem like i need to
since its all working now but i didnt wanna cut it and something else wouldnt work so i did that and the rpm gauge works perfectly and after i finished red lineing the car sounds goood ! . thanks for the help guys !
also i the gas meter suppose to stay on were ur gas is when the cars off? or cuz mine just stays up on half tank well thats were i filled it and seems to be at and goes down while driveing x) so yea.

[SilvyInside]

pic of where the ecu is at? sorry. i wanna make sure I got this.

[SilvyInside]

also did you buy a new wire? or just snipped and spliced?

[SilvyInside]

oh also, I have a sr20det Swap. which ecu pinout is that?

[lebgangstah]

take pics for me of ur ecu since ug ot an sr20det , also i had a long wire layiing around i used a hook to put it threw the dash to the cluster side and got it all in , now i spliced the wire , and attached the new wire then tapped it nice and tight , also with the ecu i did the same , i would take pics but i had everything put back together and its currently cold out and cant just go pulling it all out again , but if u show me pics of the ecu and cluster ill show u wichones ill save them in my desktop and draw diagrams if ud like?>

[SilvyInside]

any help is appreciated, thanks

[SilvyInside]

so I gotta pick up a wire tomm. any wire works?

[lebgangstah]

alright man , yea i justed used 20 gauge wire , worked perfectly make sure its long enough and that u will have slack to tuck it and everything , and if uc an get pics it would be easy i havent looked at my buddys sr20det ecu yet so dont know if its the same if that wire isnt , found then it has to be hidden some were in the ecu harness but u also wanna be carfull u dont wanna accedntly tear a wire out , i just took my car out for a spin to test the rpm works great , only problom was it wouldnt go back in my garage.. damn snow ,

or u can use any of these wires : http://www.google.ca/imgres?q=14+gauge+ ... tBA&zoom=1

[SilvyInside]

haha nice!
I may just wait for compactfan to respond to my PM.
He has an extra dohc tach.
if not, then i may go with the splice.

One thing...sounds dumb, but im a noob.
Where is the ecu located

[SilvyInside]

sr-ecu-pinouts-t495077.html

from that pic it says pinout 3 on the left.
and ecu pinout 2 on the right....?

edit...my pinout is on the left. blacktop

now, just need a diy to get to ECU

[lebgangstah]

alright sounds good , passenger side easyer way to do it is , this i took up the glove compartment and the metal pieace of it , after that take the side panel off and its hidden there ,

heres a pic : http://www.google.ca/imgres?q=240sx+s13 ... r:17,s:215

[SilvyInside]

Summary, correct me if I'm wrong.

Items - 20 G wire.

1.remove cluster.
2.get to ecu.
3.locate pinout 3 (tach) on the ecu, snip/splice wire.
4.attach one end of the new wire where you spliced at.
5.locate the tach wire on the cluster.
6.snip/splice there
7.attach other end of new wire.
8.tuck away.

sound right?

question though, since the tach from the cluster doesnt go directly to the ecu, where is it running? forcing us to splice?

[compactfean]

Yes, any wire will work. sr-ecu-pinouts-t495077.html
Look at pin 3. That's for the sr. straight from ecu to cluster. Try that. If it doesn't work then I'll sell you mine. The one I have you would have to install into your cluster with the 3 screws. Other then that nor wiring. It's just the stock dohc tach. Red line starts at like 6500 but it reads up to 8000.