View Full Version : testing the AFM and TPS

January 27th, 2008, 10:44 PM
i searched the forums and couldnt find any links to cygnus or whatever to test my CPS and AFM... could someone post up a link.. or tell me how to test them?? im not getting any CEL...

I know i have to use a voltmeter.. but at what setting and what pins do i measure?

January 27th, 2008, 10:55 PM

January 27th, 2008, 10:57 PM
thanks bud

January 28th, 2008, 02:39 PM
i verified its the TPS.. its not adjusted right so i have to adjust it.

January 28th, 2008, 03:06 PM
The TSRM link is actually in the sticky :P

January 28th, 2008, 05:38 PM
ok... i tried adjusting my TPS... and now it surges.. it goes all the way to 2500 then to like 900 and pretty quickly.. and it repeats itself... i dont know what to do =(

January 28th, 2008, 05:46 PM
What was the original symptom? I ask because there is only one that can be TPS related and yet not show codes and it's unlikely you would notice it because it doesn't effect driveability. Also this surging...does it do that on it's own or only when you press on the pedal?

January 28th, 2008, 06:36 PM
it does it on its own.. but i think i fixed it.. i got it to idle at like 1500 but aadjusting the distrubutor.. when i go from reverse to park it makes a clunking noise.

January 28th, 2008, 07:19 PM
You need to set the tps back to where it should be. Did you use a timing light when you adjusted the distributor?(if not, your timing is way off, now) I'll bet it makes a nice clunk when you shift from park/neutral to drive/reverse as well. You need to reset the timing back to 10.

There's a thread in here(n/a section) started by me, that gives a different way to test/calibrate the tps(using voltage readings). If you search by my name, there should only be one or two. Had something to do with idle, and JJ verified my findings.

Why are you testing these parts, anyway? What is the problem you're trying to diagnose?

January 28th, 2008, 08:51 PM
my idle is way the hell up there.. when i started my car before doing any of this... it would idle at 3-4k rpm... so i just turned the distributor upwards to turn down the idle... when i try to adjust the TPS it either idles way to high, or does that surging crap, and after surging 5 or 6 times it idles at 2,000.

Right now im idling at 1,500-2,000...

i kept reading all this testing shit for the tps but i dont know what the hell to do..i measured the tps thing with my volt meter... i dont know which setting on the volt meter to go to... i tried adjusting the tps with car on and in either direction it doesnt make any big differece... so i just toned down the timing...

i hate this whole tps bullshit.. its so annoying..

January 28th, 2008, 09:08 PM
As long as you don't have a code the TPS has nothing to do with your high idle. How did you "verify" it did?

1) Remove the TPS connector. Short IDL and E on the harness.

2) Also short T and E.

3) Check MIL for normal code (no code set).

4) Set timing back to stock.

Under those conditions what is the idle? If it's still not correct the TPS is innocent.

January 28th, 2008, 10:44 PM
i had code 51. before i touched the tps at all

January 29th, 2008, 07:42 AM
im not getting any CEL...

Between that and having to play 20 questions it'd be nice if you'd try not to make it harder than it already is...

January 29th, 2008, 05:50 PM
im not getting any CEL...

i had code 51. before i touched the tps at all

This a joke?

January 29th, 2008, 07:49 PM

Posts 13 and 14 have the information you need to test(and calibrate) the tps using the "DC volts" setting on your meter.