Need help finding P0500 VSS "A"

I am getting a code of P0500 need help finding speed sensor A

 

This is Vehicle Speed Sensor “B” or Output Shaft, I replaced this one already. I can’t locate Vehicle Speed Sensor “A”
I thought it was this one below, but it’s not, that one below is for the MPH on the speedometer.

 

Looks like it operates kinda like the 2nd gen trucks, the speed sensor sends the speed to the Instrument Cluster (Combination Meter) and the cluster sends it to the PCM. If your speedometer works it's most likely an open/short on the SP1 wire between the cluster and the PCM or a failed SP1 circuit in the cluster.

 

Online..... most sites say my truck needs that little first sensor.....
....but on the mcgeorge site....it only lists that second one with the gears.....no others .....other than the neutral safety switch....

I believe that other (small) one is for one of the different 340 trannys than mine....

I've been studying that 0500 code and it seems its usually a wiring issues of some sort...and not the sensor.....

 

I tested the NEW and OLD sensors with an ohm meter they read exactly the same value, which means that it is NOT the sensor.

 

Thats not necessarily true.....I believe that puts out a square wave.....
which would mean you might have to have a oscilloscope to check it....

But I know very little on this subject.....been making a list recently to replace all tranny switches and sensors...
to have oem spares on hand before the oem ones are discontinued.....

Thats when I ran into that second sensor that every site says I need...
but couldnt find where it goes.....

Mines an a43d tranny.....most here have the 340's instead.....3rz/5vz's...

I've become trusting on Mcgeorge.....there's a number of times they had the correct info based on the VIN....altered some orders BEFORE shipping...

 

Srry I looked wrong I thought your profile said 2000, here's the correct diagrams for 03.
Operation of the speed sensing circuit is the same though, if your speedometer works you need to check the SP1 circuit between the cluster and PCM.

Correct the sensor produces a square wave to the cluster and the the cluster sends a square wave to the PCM, best I can tell in service info the signal from the sensor to the cluster is 0-11v and the signal from the cluster to the PCM is 0-5v.
The signal is slow enough when the wheels are moving slowly that you can see it on a meter but a scope would be ideal.

 

There is NO WAY that there is a SECOND sensor anywhere! I looked at the tranny top to bottom and I do not see any other sensor. I believe I found the problem!

 

There is a wire short or not making contact on the FRONT RIGHT ABS SENSOR harness, I will have to remove the sensor and then check the connectors.

 

I have the A340F tranny and there is a shift position sensor, but as far as a VSS there is only ONE and then you have the one for the speedometer with the gears.

 

Did you read the description and operation of the speed circuit I posted above? The vehicle speed sensor isn't directly tied to the PCM, it goes through the speedometer. If your speedometer works you most likely have an issue between the cluster and the PCM or a bad cluster.

 

Yeah after doing research on that P500 code......
I found out about 2/3's of time its one of the abs sensors.....

Not sure why they dont just say that out front.......

If I'd known that I would of move right along to next subject....
Mine dont have abs......and they way I drive.....dont need it on the flat south.....

Dont want to be a know it all for all these,,,,,
just mine........

 

Yes I did and I did a process of elimination: VSS is Good, The Speedometer sensor with the gears checked out to be good and the wire going to the speedometer is also good, I swapped another cluster and it’s also giving me the same code. So, that leads me to believe that the problem lies on the Front Right ABS , sensor circuit as found by my INNOVA SCAN TOOL, the funny thing is that this time the ABS light did come on while I was driving then it turned off twice. Loose , wire , bad connectors or it’s nicked or the sensor wires are touching each other in the loom.

 

So your speedometer works but you are getting a P0500 in the PCM?

 

OP, if you can answer this question. It will help a lot.

 

Yes it does work, I also replaced the speedometer sensor with a OEM TOYOTA, it did not come with the gear wheel. But, that was not the problem, both sensors checked out with the tests that dm93 posted. It’s been very busy for me at work, had not had the chance to test the ABS harness yet. This morning the ABS light flashed and then turned off again. So, that leads me to believe that the problem is in the front right circuit.

 

Really need to check voltage on the SP1 circuit with the cluster unplugged, one of the modules on the circuit may be pulling it to ground and not allowing the speed signal to be generated.

 

Well it turned out that the Speed Sensor A was not getting any voltage or a ground for that matter! So, I am going to have the wires traced and see if I can restore the correct voltage to the sensor.

 

UPDATE: I fixed the broken wire going to the speed sensor, but it did not solve the problem, the problem was that the combination meter was not sending the signal to the ECM , replaced it with another and it did not work either , I was dumbfounded and I then tried two more combination meters and the last one worked ! So, be cautious on where you get these speedometers from.

 

Hey so what if your speedometer and cruise control aren't working and I'm getting that code also to note I just changed basically everything in the front except the wheel bearings but I had to disconnect the sensor bolted to the side of the housing any advice?