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Speedo and odometer reading super slow r34gtt a/t

VicFlo
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VicFlo Newbie

VicFlo

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HI, Ive got an r34 gtt sedan A/T. The instrument cluster went out and I replaced it with another A/T everything visually looks the same and all the gauges work now with the exception of the speedometer and odometer. The speedo will stay pinned at zero until I'm going about 55kmh and then it'll say Im going about 5kmh. my odometer seems to be tracking at about a 1/10 of what it should. If I go 1km it'll say I've only gone 0.01. Appreciate any and all help. Ive tried searching through the forums reddit and a local fb group. The only info I think I've found is that some cars didnt come equipped with TCS (mind is) and the clusters may be different between those? I've also installed a brand new VSS and no joy obviously. TIA. 

GTSBoy Grand Master

GTSBoy

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Yes, the speed sensors are quite different between NA and turbo. Completely different waveform. I'm surprised it's picking up any pulses at all if it is the wrong one.

As to the original problem... "the instrument cluster went out". What does that mean? What died and how? Is there any hope that you could transplant teh speedo head from that into the new one?

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VicFlo Newbie

VicFlo

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By went out the old cluster completely died first it was the odo lcd then the gauges stopped working, Nissan said the board/chip went bad. I then ordered a used one off of amazon. I can transplant the speedo gauge itself I still have the old bad cluster. in fact I am trying to visually inspect to see any differences between the two. The back of the speedos themselves have a different number on the top one has a 5 the other has a 6 i believe printed at the top and the original motor looked a bit larger. On the board itself behind the speedo I saw a few differences looks like towards the bottom the my original board didn't have a resistor at R3. The SMD chip in the top right has some different numbers on it (maybe I can swap these) and the resistor at r16 might be different colors.

So the new cluster came from a non turbo but it did have TCS the ebay seller said. hopefully these images will show: 

New clusterspacer.png broken clusterspacer.png

 

I will try to transplant just the speedo first.

VicFlo Newbie

VicFlo

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So I'm confident in saying its TCS thing. My new cluster I never realized didn't even have bulbs in the TCS or Slip slots. Shining a light through the backside that black plate has nothing for it, unlike my original cluster. Looking at the service manual the only thing that stands out is TCS in relation to the vehicle speed, it has nothing to do with turbos. It sadly looks like I may just need to get the appropriate cluster.

pacman_1219 Rookie

pacman_1219

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Can confirm I've had that speedo issue on my GTT. Cluster was from an NA car, all other gauges worked perfectly except the speedo.

Get a cluster from a turbo and it should be ok. You can actually swap out the individual gauges on the cluster which I thought is pretty neat.

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