TPS voltage won't go lower than 4.95v..

jrichker said:

Check the black/white wire resistance. Connect one ohmmeter lead to the black/white
wire on the TPS and one lead to the negative post on the battery. You should see less
than 1.5 ohm, more than that indicates a problem. Always take resistance measurements
with the circuit powered off.

Click to expand...

You guys must be suffering from information overload. The answer was in my last post.

word

well it all depends how you want to fix it. if you dont care how it looks, just splice into the black wire and ground it to the intake. if you want to fix it the "right way", read on.

you could have a problem at the black & white connectors at the back of the intake. or at the computer connector. i believe its internally grounded in the computer but you already tried another one so thats not it. you simply have an open in that wire somewhere. any damage to your harness?

How it is supposed to work:
The black/white wire (pin 46) is signal ground for the computer. It provides a dedicated
ground for the EGR, Baro, ACT, ECT, & TPS sensors as well as the ground to put the
computer into self test mode. Since it is a dedicated ground, it passes through the computer
on its way to the computer main power ground that terminates at the battery pigtail ground.
It should read less than 1.5 ohms when measured from anyplace on the engine harness with
the battery pigtail ground as the other reference point for the ohmmeter probe. What sometimes
happens is that it gets jumpered to power which either burns up the wiring or burns the trace
off the pc board inside the computer. That trace connects pins 46 to pins 40 & 60. Only an
experienced electronics technician can open the computer up & repair the trace if it burns
up and creates an open circuit.

How to test the wiring :
Measure the resistance between the black/white wire on each of the following sensors: TPS,
ECT, ACT, EGR and MAP/BARO. If you find one that is greater than 1.5 ohms, measure between that
sensor and pin #1 of the white 10 pin connectors. Pin #1 is the center pin and is labeled
sig-rtrn on the diagram

i would vote for the connectors then

Some more help...



All the references to the white connector are for the 10 pin white connector.

no problem man...my problem was an intermittent high idle and engine light with TPS and EVP codes, caused by the bad factory splice in the orange wire (5v reference power) going to those sensors. i took it apart and soldered it, when i changed my fuel injectors. fyi, that factory splice it merely crimped, not soldered. then its covered with butyl (sticky rubber goo) to seal it. if you have things ripped apart already, you may want to do this as preventative maintenance.