Speedometer not working P0500 code

Here is how you can check ABS codes yourself.

Check for codes and go from there.

First, connect terminal 4 and 13 of the OBD-II socket (under the dash in front of your left knee) with a jumper wire. (Those are the 4th from the left on the top and the fifth from the left on the bottom.)

Turn the ignition to on. You'll notice lots of flashing lights, but just pay attention to the ABS light. Normally, it should be rapidly and steadily flashing, twice per second. If it has stored a trouble code, it will instead be flashing a pattern that will coding a two-digit number. There may be more than one code being flashed out. It will just repeat the code over and over,so you have plenty of time to figure it out and write it (them) down.

NOW you can clear the codes. Just tapthe brakes rapidly 8 or more times,about two taps per second. You don't have tojam on the brakes, just tap them enoughto blink the brake lights. Ifyou're successful, the ABS light should return to its normal fast blinking. Now remove thejumper wire, and finally turn off the key.

Now when you turn on the key, the ABSlight should just do its normal light forthree seconds and go off. If it comesbackon, you still have a problem

 

Okay just disconnected the hyper tech and still have the same issue

 

If your losing vehicle speed on the scan tool figure out where the pcm gets that info and start there.

Im not at work so i cant look up a schematic. I think @Jimmyh has posted a speedo diagram in the past

 

If it’s an Auto it goes from the wheel speed sensor to the skid control ECU then to the Combination meter (speedometer)

If it’s a Manual Trans it goes from the Speed Sensor(on the Trans) to the Combination Meter (Speedometer)

Although this is for a V6, it should look something like this
https://www.tacomaworld.com/threads/speedometer-and-odometer-error-corrected-easily.293134/

 

I just pulled the speedo gear from my extra R155 and I’m about to swap that in. Hopefully it was a shredded nylon gear on that causing the issue. I’ll report back a little later

 

Well that fixed it! As you can see on the old one below the inside of the gear’s edge is lower than the outside and wasn’t engaging. This is on my 2009 5speed manual R155 for reference

 

This.