924runner4wd

Hello everyone and thank you for your knowledge. I've been kreeping Yotatech for a year now since i bought my son his 1st vehicle (you guys have help me a lot!). The speedo was not working upon purchase so i bought a new speed sensor, worked for a year. Speedo quit working intermittent,usually works for up to 5 miles (odo still working) then bounces and quits. Then we run into the tranny not shifting. Bought a new speed sensor and nada. No speedo or odo even with the old one put in. searched speedometer in forums no answer i can find. any input is welcome. thanks again.

scope103

The odometer works but the speedometer doesn't? If you have the electronic speed sensor in the transfer case, that has to mean that the problem is IN the combination meter. The transmission has it's own speed sensor (VSS1 in the transfer case drives the speedometer; it would do no good to measure before the transfer case because of Hi/Lo. VSS2 in the transmission controls the shifting.)

So which sensor did you replace?

VSS1 has an oring on the shaft to keep ATF out of the sensor. If that oring fails, it could interfere with the hall-effect sensor chip. You might take a look at whether there is ATF inside the sensor. Otherwise, I would first suspect wiring (but then the odometer wouldn't work.)

924runner4wd

odo works, speedo doesn't. I changed the sensor that is located on trans. where the drive shaft connects. I have a new and an old sensor and both are giving me the same symptom. I pinched the tabs in the connector to the sensor to make sure it would get a solid connection. I guess next check is wiring to speedo or speedo in the dash itself.

scope103

"trans"mission? "trans"fer case?


In any event, if the Odometer works, your problem is not in the speed sensor. (Unless you have a "cable" speedometer, where VSS1 is located inside the combination meter, but I'm pretty sure your talking about the electronic speedometer.)

Good luck!

924runner4wd

My bad. it was the vss1 in transfer case. Thanks for the schematic.

924runner4wd

All connections in dash on back of speedo look good. If the odometer works and speedo doesn't I am to assume that it is within the cluster panel in dash?

924runner4wd

oh yeah, yes it is electronic there is no speed cable

924runner4wd

sorry, but it will not switch gears. my understanding is that speedo receives speed sensor data which then sends it to ecu?

scope103

Why don't you "ask."

You don't tell us which transmission you have (it's on the door pillar), but assuming you have the A340H you can just check for codes. http://personal.utulsa.edu/~nathan-b...31diagnosi.pdf Since you know the sensor is good (the odometer works), you may have a broken wire.

924runner4wd

as usual a wealth of knowledge from yotatech. diagnostic codes read normal. test drive revealed normal transmission shifting, odometer turning but no speedo? transmission was correctly guessed a340h, either a bad wire or new cluster panel needed