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Tach and Speedometer do not work on my automatic 93 RX7. HOLD light flashes
Does anyone has an idea why my tachometer and speedometer do not work?
I also noticed that the HOLD light flashes after I start moving the car. My overdrive also stopped working. I sent the gauge cluster to a company in MA called BBA Reman, and the tested all the gauges and said they work. I also took the car to the local Mazda dealer and they contacted someone in CA and they said those cars suffer from that particular issue. I tried replacing the tranny computer but to no avail. Any help will be greatly appreciated. Thanks
Last edited by El Fiebru; 10-19-09 at 10:35 PM.
Reason: mispelled words
i had the exact same problem on my auto when i had a local transmission shop rebuild mine after it went out. The tech did not take notice to where the wiring harness' went. I finally found a guy in Portland that fixed my car in 5 minutes after i had it all over my local town to half dozen transmission shops. THe guy in portland said the mechanic had left a wiring harness lying loose cuz he couldnt figure out where it went. I would look on top of your bell housing and see if you see any wires or harnesses floating around.... all i know is my car did the exact same **** and he plugged a wire back together from the transmission and it worked great
Its a service TSB recall, or it sounds suspiciously like one of the factory recalls for the 1992 - 1993. Google "FD3S Hold light flashes" and near the top of google results should take you to the recall information.
From memory, it involves replacing the primary engine ECU with an N3A1-xxxxx-B revision ECU. Not the trans ECU.
this thread is one of those that starts and never climaxes. it lets lifted up only to slump back down...
I have the same issues. Anyone else find solution other than loose wires?
The Hold Light will flash when there is something with the transmission. Similar to the check engine light, you can set it up to read the code that the trans is throwing.
I've noticed that when the speedometer is not functioning, the hold light will continue to blink until the speedometer is working again. This is likely because the transmission computer is not getting vital information that it needs to properly shift the car i.e. transmission output rotation speed (converted to car speed through the speedometer gauge). IIRC, the car goes into a limp mode of sorts and just does it's best to guess the car speed from it's other sensors and shifts a bit conservatively. I think it also locks out the Hold mode as well so you can't even shift it yourself.
Now, the hard part is why is your speedometer not functioning. There are many things that can go wrong; the speedo itself could be bad, it could be a bad electrical connection between it and the speed sensor, or it could be a bad speed sensor, or a bad ground somewhere. Seeing as your tach is not working as well, I'd guess at a bad gauge cluster since that is all too common with these cars. Swap it with a known good one and see if your problems go away. Short of that, I'd get out the service manual and check every electrical connection and sensor for proper operation.