On a 1990 madza 323 the transmission hold light is flashing and my speed ometer quite working at the same time the light started flashing is that a sign that the speed sensor has went bad

SOURCE: 1998 Rodeo Transmission Speed Sensor

i think near rear of trans near output shaft

SOURCE: Overdrive light flashing on my 1994 Lexus ES300/speedometer quit

I bet money on the tranny speed sensor being the problem- I think NAPA has em for about $100 bucks or so, but that has been a while. Good luck

Marvin

• 85242 Answers
• Posted on Apr 14, 2009

SOURCE: down shift. flashing hold light

THE TURBINE SPEED (PART OF THE TRANSMISSION CONTROLS) SENSOR IS THE CULPRIT HERE, REPLACE IT.

SOURCE: willnt start

This problem is normally caused by a faulty ignition module, which is located inside the distributor. They seem to be a weak point on Mazda 323s of this era. Open the distributor, and remove the rotor button. There is a round plastic cover over the ignition module, which must be removed. The ignition module is semi circular, and has four wires attached to it, via small screws. Take note of the location of each wire, and unscrew each one. The ignition module can be unscrewed with a phillips head screw driver, and removed. When fitting the replacement module, you must cover it with the heat sink compound that is supplied with the new module (mechanics sometimes refer to this compound as ignition module grease). Without the heat sink compound, the new module will over heat, and burn out. You should be able to replace the module in 15 minutes, it is very easy to do.

SOURCE: Can a bad output speed sensor cause a transmission to leak?

There is a small o-ring seal so I would say it is possible