i have a a 1994 toyota 4 runner 255000 miles on it had transmission issues before mostly shift solenoids
the other day the check engine light came on (tps sensor) no 5 volt signal at reference wire it was bad so i replaced it
now the transmission has no kick down does it have any thing to do with the tps sensor
when testing the tps signal i noticed there was one wire with 12 volts on it what is that for??

 

A few periods, or commas, in that sentence might help.

Your transmission is electronically controlled, and the TPS is an important input. If the TPS is not working correctly, it probably won't shift correctly.

Do you know how to test the TPS? http://web.archive.org/web/201108151...93throttle.pdf

 

I think you have mixed up your notes. TPS has four wires, none of which should have 12 volts. VAFM has five wires one of which is battery voltage.

If you really have 12 volts on Vcc at either you've shorted a few wires together or your ECU is faulty.

 

tps only has 4 wires. and one does have 12 volts on it. and i didn't short out any of the wires
could one of the injector wires be shorting to one of the tps wires giving me 12 volts??
they do run throuhg the same loom.

 

Pop open the kick panel, unbolt the ECU, locate the VCC wire and UN pin it from the plug. Now turn the ignition to run and test the voltage output from the ECU on VCC. If it's not 5volts it's an ECU problem, if it is 5 volts it's a pinched wire..

There are a lot of wires it could be and they all run thru the shared engine harness..

 

do you have a diagram to tell me what wire is the vvc wire

 

Nope! Because you didn't give the full vehicle spec

 

Middle plug. top right, or third from the right bottom row, when viewed with the plug releases at the top.

 

You don't have a kickdown cable, it shifts when it wants to...

 

thanks for the help

 

some input must tell it when to down shift im assuming tps has a lot to do with it