got a 90 s5 , has a unconsistant hesitation throughout the powerband. so checked the ecu cel codes. got code 3, 11, 12, 17, 18. which is CAS, Intake thermo, TPS, o2, TPS. so i went to check my tps readings and i got nothing. checking it correctly i believe , + to pin, - to ground/battery. i tried all 6 pins and got nothing, is my tps completely shot or am i not doing something right? any imput appreciated...

 

TPS test & set
Using test lights or voltage at idle readings will get your idle setting perfect, but you could still have a worn out TPS resistor.
-The golden test:
Unplug the TPS connector.
Clip a cheap analog (needle type) VOM on the orange & black pins.
Set it to the 1K scale.
Hold off the throttle & work the short range TPS plunger in & out.
You should see a smooth sweep from ~0 to ~5K ohms.
Any bad spots or drop outs in the stroke - it's bad & will give fuel cuts at part throttle.
(Before you toss it, try spray contact cleaner between the sleeve & plunger.)
- Then set it:
Find the fast idle (warm-up) cam & push it back so the throttle sits on the hard idle stop.
Adjust the setting to 1K ohms.
While holding off the fast idle cam, open & close the throttle a few times to see that the 1K setting repeats.

The upper (long range) TPS is self adjusting.
You shouldn't have to mess with it.
Its job is to tell the ECU how to run the MOP.

Then disconnect the battery ground, step on the brake, & reconnect the battery to reset the codes before blinking them again.

 

ok got a volt meter and connected it to the black and orange wires. came up with 5.42 ohms, idle and WOT??? ive done this before on an s4 and an fd and i didnt have a problem, lol. btw thanks for the help.

 

ok tried the yellow and blue wire, and got .94 at idle, and 4.25 a WOT. it all went smoothly up and down the numbers.

 

fixed the cel light. was an loose tps connection, and no connection on the intake thermosensor. only problem now is the idle is slowly lumping from 500-1200.. any ideas on that???