TPS signal randomly goes to 0%
08-28-2011, 11:14 PM
#1
TPS signal randomly goes to 0% Car has had some problems with stalling out, and all started since we installed the FAST 102/102 setup. The tuner mentioned the TPS signal goes to 0% at some random moments, and then it goes back to normal . So ofccourse without a TPS reading the pcm can't keep the engine idling right and it dies out.
It happens randomly, and I have had it last anywhere from one minute, up to a half hour at times. It gets pretty annoying having to restart the car every time you come to a stop
Atleast it doesn't do it all the time.
Has this happened to anyone else?
The tuner mentioned it is probably the wiring to the TPS. I will attempt to fix it myself. Will it be as easy as finding the wires on the PCM that come from the TPS, and rewiring that? Or should I also remove the entire wire/pin from the PCM and do that over as well.
It happens randomly, and I have had it last anywhere from one minute, up to a half hour at times. It gets pretty annoying having to restart the car every time you come to a stop
Atleast it doesn't do it all the time.
Has this happened to anyone else?
The tuner mentioned it is probably the wiring to the TPS. I will attempt to fix it myself. Will it be as easy as finding the wires on the PCM that come from the TPS, and rewiring that? Or should I also remove the entire wire/pin from the PCM and do that over as well.
08-29-2011, 06:08 AM
#4
You may need to change the wiring from TPS to PCM, it may be a cracked wire. You can install a temporal wiring without removing the old wires nor touching the harness, just splice the wires from the TPS directly to the PCM. If it solves the problem then do a permanent installation.
08-29-2011, 08:33 PM
#6
If the TPS sensor was replaced and problem persists, you have only 2 things that can be causing it: The wiring and the PCM itself
You don't need to modify the wiring from TPS to ABS, because the PCM is losing TPS's signal (forget about ABS for now). I assume you have a datalog to confirm the PCM is losing TPS signal randomly.
So, it's as easy as splicing 3 wires from TPS to PCM: Ground, +5V and signal. If any of these 3 wires is broken can cause the problem you have.
Buy 18 Gauge wire, cut, splice, solder, isolate, and test.
You can easily fix the original wiring with a little solder and thermofit sleeve.
08-29-2011, 09:23 PM
#7
Car is a 02 Trans Am. Yup the tuner mentioned thats why the car keeps dying out randomly, it keeps loosing the TPS signal.
Where can I find a +5v source from? I know the dark blue wire is the signal going back to the PCM. And I am assuming the black wire is the ground right? So that would leave the gray wire as the +5v?
Did you check out that diagram I uploaded?
So, it's as easy as splicing 3 wires from TPS to PCM: Ground, +5V and signal
Did you check out that diagram I uploaded?
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08-29-2011, 10:30 PM
#8
Yes I checked your diagram and it's correct.
You can get +5V from MAP sensor, gray wire.
The black wire is ground, yes.
So, the blue wire is the signal from TPS to PCM. You can install one at a time and test, blue first.
Here are the wiring diagrams for your car in case you need them:
You can get +5V from MAP sensor, gray wire.
The black wire is ground, yes.
So, the blue wire is the signal from TPS to PCM. You can install one at a time and test, blue first.
Here are the wiring diagrams for your car in case you need them:
