1G Is my TPS bad?

[toofast82]

I went ahead and checked the resistance of my tps. i can get the adjustment to be at 1.1ohms at closed throttle but only about 4.5 at wot. i know it is supposed to be at 5k. there is no way i can get the adjustment that high. also at closed throttle with pins 1 &4 connected it only goes to about 4.5 as well. can anyone help. my a/t trans is shifting kinda funny as well and want to go over everything before i decide its the trans itself.

 

[cjridert1]

Dont worry about the resistance, just voltage for this guy. Can you log raw voltage? If not, just get that multimeter out. @ idle/closed plate, you want .63v and for WOT anywhere near 4.5v. Dont get too hung up on the WOT TPS voltage, but do make sure you have .63v in closed plate situations.

 

[STI2TALON]

Do you have a safc? set it for peak and hold on the tps value. I did a correlation between my voltage readings and my throttle position and adjusted until I had both where I wanted them.

 

[steve]

I went ahead and checked the resistance of my tps. i can get the adjustment to be at 1.1ohms at closed throttle but only about 4.5 at wot. i know it is supposed to be at 5k. there is no way i can get the adjustment that high. also at closed throttle with pins 1 &4 connected it only goes to about 4.5 as well. can anyone help. my a/t trans is shifting kinda funny as well and want to go over everything before i decide its the trans itself.

Sounds like you made the mistake of reading the VFAQ TPS adjustment page and now are confused because it's all wrong.

The spec for the TPS total resistance is 3.5k to 6.5k ohms, so 4.5k ohms is fine (assuming you meant 4.5k not 4.5 ohms). You can't set the TPS by resistance without computing the correct value for your car. The actual +5 sensor voltage varies from car to car as doe the total resistance of the TPS. Both are important parameters for calculating the resistances of a voltage divider.

For a stock 1G ECU the TPS should be set to 0.5v output. DSMlink prefers 0.63v but the FSM says 0.48v to 0.52v and I haven't found anything in the stock code that makes me think otherwise. The easiest way to tell is if you have an SAFC you can watch the sensor check screen for the measured voltage. A datalogger should read 10% since 0.5v is 10% of the 5v possible output.