code 67, is it legit?

Isnt 67 for the car not being in neutral or having the A/C on?

Yes it is.

x2 I did that too...

and dont check TPS from lead to body ground, check it from lead to the black wire (ground) coming from TPS... don't know exactly why, just heard this from jrichker so it should probably be done

maybe to bypass any bad ground downstream

Euphoric306 said:

and dont check TPS from lead to body ground, check it from lead to the black wire (ground) coming from TPS... don't know exactly why, just heard this from jrichker so it should probably be done

maybe to bypass any bad ground downstream

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Because one wants to use the ground which is used by the sensor, to accomodate any resistance it might have.

And my other question was rhetorical - code 67 should not cause the issues described that I can figure out. I was fishing for more info.

uh... what?

D347643 said:

excuse me guys im sorry i meant code 63. sorry sorry.
Now if i grounded the tps to the body wouldnt the voltage never pass through the tps hence the not getting a signal and throwing a code?

Drew

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I dont get why you would ground the TPS to the body - or do you mean that you added an additional TPS ground wire (connecting to the existing ground wire)? As long as you dont short out the VREF or Sig, it should work fine AFAIK.

I would note the static TPS value and the value as it sweeps through its range. It sounds like the TPS or its wiring is giving you issues - just got to narrow down which.

Good luck.

Code 63 - Throttle Position Sensor (TPS) signal too low TPS . TPS out of adjustment, or 5 V VREF missing, broken wiring or bad connections.

Try this... Currently there is some dispute about setting it at .99 volts being worth the effort, but anything less is probably OK. All you need is less than 1.0 volt at idle and more than 4.25 at Wide Open Throttle (WOT). You'll need a Digital Voltmeter (DVM) to do the job.

Wire colors & functions:
Orange/white = 5 volt VREF from the computer
Dark Green/lt green = TPS output to computer
Black/white = Signal ground from computer

Always use the Dark Green/lt green & Black/white wires to set the TPS base voltage.

Use the Orange/white & Black white wires to verify the TPS has the correct 5 volts source from the computer.

Here’s a TPS tip I got from NoGo50

When you installed the sensor make sure you place it on the peg right and then tighten it down properly. Loosen the back screw a tiny bit so the sensor can pivot and loosen the front screw enough so you can move it just a little in very small increments. I wouldn’t try to adjust it using marks. Set it at .97v-.99v, the closer to .99v the better.

(copied from MustangMax, Glendale AZ)

1. Always adjust the TPS and Idle with the engine at operating temp. Dive it around for a bit if you can and get it nice and warm.

2. When you probe the leads of the TPS, do not use an engine ground, put the ground probe into the lead of the TPS. You should be connecting both meter probes to the TPS and not one to the TPS and the other to ground.

3. Always reset the computer whenever you adjust the TPS or clean/change any sensors. I just pull the battery lead for 10 minutes.

4. Check the procedure for your year, on my 90 I have to turn the idle screw until it just touches the tab, then insert a .010 feeler gauge and give it about one more turn. Then you adjust the TPS voltage to .98v, reset the computer. Start it up, if the idle is to low then turn the screw in until it is just right, then readjust the TPS voltage to .98v and reset the computer and start it up. The key is to adjust the TPS voltage and reset the computer whenever the idle screw is changed.

D347643 said:

maybe i should explain a little better, lol. I have my voltmeter with the positive lead on the green wire and the neg lead to the body checking the voltage from the green wire. Most people say that i should have the neg lead from the voltmeter on the black wire of the tps. I think now i see why. make sense?

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Yep. And I would use the TPS's ground wire. This will allow you to measure the power and ground that the computer uses. It will also show you a bad or weak ground.

Though redundant with what you know, here is some info. This article mentions grounding through the TPS ground or otherwise, but the former is better.

Good luck.