Sorry, I overlooked the manual transmission you listed. Still, the speed sensor is on the transmission, on top of the housing where the right half shaft comes out. I don't think you'll be able to see it from on top. You'll have to crawl underneath, then reach up to feel it. There is a single 10mm hex bolt on the driver's side of the sensor. You'll need a 1/4" ratchet and a short extension.
Twist and tug and it will come out. When you pull it out, look at the plastic gear and check to see if it turns really hard. I've seen some that appeared to be overheated and melted, and they turned kind of hard, but still worked ok. I could see one getting so tight that the teeth wore off. The dealer will have replacement gears and sensors, but since both of these fail so seldomly, I'd trust salvage yard parts in this case. Be sure to use the same color gear. They are different according to number of teeth.
Let me double check with you too; there should be three wires on the connector. If you find only two, then my memory is shot. My '88 Grand Caravan was the last year for the two-wire sensor with a speedometer cable. The sensor was just for the cruise control. My '89 Voyager uses the same two-wire sensor but has no speedometer cable. In this year, the cruise control AND the speedometer will quit when the sensor fails. It is a reed switch and rotating magnet.
Oh crap. I just had two brain fades. You could indeed have the older two-wire sensor yet. They switched over to the very reliable three wire sensor, but possibly not by '92. If you have the two-wire sensor, you found the problem. Sorry for running you in circles. This was such a common problem, based on the symptom listed on the repair order, we never bothered with a verification test drive or any in-shop testing. We just popped a new one in. Along with the new sensor, before you insert the plug, pull out the little red pimento in the center, then use a small needle nose pliers to gently squeeze the female connectr pins. That was just a little insurance to prevent potential intermittent problems in the future.
My second brain fade is a simple test. If you have factory cruise control, does it work? If it does, the speed sensor is working. Wish I would have thought of that right away.
Sunday, February 28th, 2010 AT 1:08 PM