Speedometer

JDM GT Four, ST185RC and ST205.

Speedometer

Postby bigrob8134 » Thu Sep 12, 2019 12:16 am

Having issues with my speedometer not working. I replaced the sensor on the transmission and still not working. I have a 91 gtfour st185. If anyone can please let me know what else can I check or might be the problem. Thank you
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Re: Speedometer

Postby underscore » Thu Sep 12, 2019 2:49 am

How do the capacitors on the back of the speedo look?
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Re: Speedometer

Postby bigrob8134 » Thu Sep 12, 2019 3:05 am

Don't know. Are they located behind the gauge cluster.
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Re: Speedometer

Postby bigrob8134 » Thu Sep 12, 2019 3:06 am

Thank you and appreciate your help and time.
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Re: Speedometer

Postby FC Zach » Thu Sep 12, 2019 3:39 am

When I had an issue with my speedo, I found that my key had one of its stamped ends sheared off and a broke driven gear (the keyed end of the gear's shaft broke). . . this chain reaction was because of a failed cable adapter, which appears to have been caused by bearings.

If I were you, I'd check the cable adapter before replacing anything (or you'll be doing the repair again). Here's the thread where I shared my findings. .

https://www.alltrac.net/phpBB2/viewtopic.php?f=43&t=52749&p=485078#p485078
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Re: Speedometer

Postby bigrob8134 » Thu Sep 12, 2019 4:09 am

Does it make a difference or matter that I have a gtfour rc .
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Re: Speedometer

Postby FC Zach » Thu Sep 12, 2019 4:28 am

bigrob8134 wrote:Does it make a difference or matter that I have a gtfour rc .


Regardless of the model/trim, I believe they all have the cable adapter. . cruise control is a different story, some don't have that (correct?) and I assume you might since you mentioned replacing the sensor. The sensor wouldn't have anything to do with your speedometer not working (IIRC).

I would check all the mechanical parts first.

underscore wrote:How do the capacitors on the back of the speedo look?


Are you thinking of tach? Depending on the year, I think the speedo has caps on it but this wouldn't prevent the gauge from working would it? Either way, here's a good write-up on getting access to your gauges to make this type of repair.

https://www.alltrac.net/phpBB2/viewtopic.php?f=49&t=48848
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Re: Speedometer

Postby bigrob8134 » Thu Sep 12, 2019 4:54 am

Good looking and really appreciate the help.
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Re: Speedometer

Postby FC Zach » Thu Sep 12, 2019 5:06 am

No problem. . in the event you need the adapter, you might find that it is no longer available but there is another viable option (83770-17020) that another member found from an MR2.

Worth a shot
https://www.alltrac.net/phpBB2/viewtopic.php?t=53301
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Re: Speedometer

Postby underscore » Thu Sep 12, 2019 5:07 am

FC Zach wrote:
underscore wrote:How do the capacitors on the back of the speedo look?


Are you thinking of tach? Depending on the year, I think the speedo has caps on it but this wouldn't prevent the gauge from working would it? Either way, here's a good write-up on getting access to your gauges to make this type of repair.

https://www.alltrac.net/phpBB2/viewtopic.php?f=49&t=48848


The speedo has a bunch of caps on the control board for it, at least the one in my RC does. I don't know how the speedo circuit functions but generally speaking if the parts are there they aren't exactly optional. I would've replaced them purely for prevention (like I did with the tach) but a couple required significant disassembly of the speedo to get to.
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Re: Speedometer

Postby FC Zach » Thu Sep 12, 2019 5:28 am

Do RCs have a cable driven speedometer? If not, disregard my suggestions :)

I know very little about the particulars when it comes to differences like this between AllTrac and RC trims. I apologize if they are completely different. . but hey, at least there's a nice How-To thread I suggested that might help :D
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Re: Speedometer

Postby alltracman78 » Thu Sep 12, 2019 4:05 pm

JDM 185s [including RC] had an electric speedometer.
North American ones had a mechanical one.
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Re: Speedometer

Postby bigrob8134 » Sun Sep 22, 2019 11:52 pm

So since I have an RC and the speedometer is electric. Where should I start. I already replaced the sensor and that didn't fix the problem. All of the other gauges work.
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Re: Speedometer

Postby r-town » Mon Sep 23, 2019 1:28 am

bigrob8134 wrote:So since I have an RC and the speedometer is electric. Where should I start. I already replaced the sensor and that didn't fix the problem. All of the other gauges work.


One possibility is that the internal plastic ring (gear) inside the transmission is toast, this will be a pain to replace.
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