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post #1 of 112 (permalink) Old 12-20-2010, 04:46 PM Thread Starter
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speedo: 1 me: 0... time to call the gurus!!!

So... today I fiddled again with my speedo and replaced the speed sensor yet again with a tested good one.

I have two clusters, swapped both and nill.

I pulled out the ecu harness to check for resistance at the speedo pins and that checked good, so there is a good signal to the ecu.

now... somewhere between the ecu and the cluster the signal is lost.

I checked the speed sensor per FSM recomendations and it checked out good. I looked all over to see how to test the cluster to no avail.

Anybody got any idea what to take apart in the cluster or what to do to see the needle move up and down at least?

Red 90 NA TT conversion, Upgraded Eprom, divorced downpipes,Custom 2.5exhaust, pop, 5 puck clutch, 1 piece DS
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post #2 of 112 (permalink) Old 12-20-2010, 06:46 PM
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Re: speedo: 1 me: 0... time to call the gurus!!!

on the fender wall where the fuse panel is, there are 2 small round connectors in front of the fuse block. I dont know what they're supposed to read, but i know one of those goes to the tach, and one goes to the speedo if mind serves me right.

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post #3 of 112 (permalink) Old 12-20-2010, 07:39 PM
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Re: speedo: 1 me: 0... time to call the gurus!!!

Dude so even after putting in a "new" speed sensor in, it still wont work? Good luck bro!

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post #4 of 112 (permalink) Old 12-20-2010, 10:07 PM Thread Starter
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Re: speedo: 1 me: 0... time to call the gurus!!!

@ Lum: I'll take a look into those tonight! crossing my fingers! thanks!

@ Colombo: yeah bro... I was SO disappointed man... I know I can't thank you enough for letting me have it, I just hope it works after all is said and done

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post #5 of 112 (permalink) Old 12-20-2010, 11:56 PM Thread Starter
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Re: speedo: 1 me: 0... time to call the gurus!!!

so I looked at the fuse panels, but I don't know what I'm looking for

no round connectors here



and no round connectors anywhere around under the kick panel




can you point me in the right direction please =)

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post #6 of 112 (permalink) Old 12-21-2010, 12:37 AM Thread Starter
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Re: speedo: 1 me: 0... time to call the gurus!!!

so I take it that this is where I should be checking for signal?

the speed control amplifier?

http://www.300zx-twinturbo.com/cgi-b...&total=133

or does that have nothing to do with the speedo working or not?

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post #7 of 112 (permalink) Old 12-21-2010, 12:49 AM Thread Starter
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Re: speedo: 1 me: 0... time to call the gurus!!!

so after loitering around the net I came across this nice little read, thought I might share for future reference

http://www.twinturbo.net/nissan/300z...er-repair.html

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post #8 of 112 (permalink) Old 12-21-2010, 01:13 AM
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Re: speedo: 1 me: 0... time to call the gurus!!!

That's a helluva find. Hopefully this may be your solution, although a time consuming one. Bookmarked that one.

If you look at this diagram, that Vigman posted a while ago, it appears that the only connection to the ECU is at pin 53. This diagram appears to have the speedo pin numbers for vehicles without air bags.
The other connections at the speedo are---
L (blue) off of speedo pin 16 to speed sensor [pin 14 on the online service manual (OSM) for with air bags]
Y/G off speedo pin 17 to ECU pin 53 [pin 15 OSM with airbags and it feeds to the ASCD not ECU. ASCD looks independent of ECU in OSM]
Y/B off speedo pin 18 to speed sensor [pin 16 OSM with airbags]
B off speedo pin 14 to ground [pin 22 OSM with airbags]
14 and 18 are tied together, so 18 would be the grounded wire on the sensor.
Power to the speedo comes from fuse 10, 2D on the diagram to pin 24 [pin 29 OSM with airbags]

ECU pin 7 goes to the tach (I assume off ECU signal generated from CAS).

I've read in past posts that the ECU may have something to do with conditioning the signal to the speedo. I'm ready to be flamed but I don't see any feedback wire from the ECU to the speedo itself (unless pin 53 is it based on other inputs at the ECU, which wouldn't be a conditioned speed signal back to the speedo), so my theory is that the two wires to the sensor off 16 and 18 would indicate you could test the speedo itself by taking the sensor out to the dash and running some wires off it to 16 and 18, spin the sensor and see if the speedo moves. Don't know if you trust this theory before getting any other comments on it or if you're brave enough to try it. It may prove the speedo works or not.

Which pins at the ECU are you checking for continuity with the speed sensor? That might just blow this theory up.

https://www.zcar.com/dlattach/attach,..._893846.0.html

https://www.zcar.com/dlattach/attach,..._893846.0.html

zippityzda
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post #9 of 112 (permalink) Old 12-21-2010, 02:39 AM Thread Starter
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Re: speedo: 1 me: 0... time to call the gurus!!!

I hear you... although a case of lager should help me through this journey! ;D

although... I'll still just wait for someone else to chime in on testing the signal all the way to back lines of the cluster :P

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post #10 of 112 (permalink) Old 12-21-2010, 07:10 AM
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Re: speedo: 1 me: 0... time to call the gurus!!!

sal, the two plugs to the right of the fuse box in picture one. Follow the wires towards the headlight.

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