Using a resistor to cure high TPS resistance?

[Max777]

EDIT: Did the math wrong... a resistor ADDS 800 to the 7,000 ohm value, not subtracts it... doh.

-Max.


I've been mucking around with my car a little, and found out that my TPS maxes out at 7K ohms. I checked the curve with a manual volt meter, and its nice and smooth, the only problem being that it has high resistance during full throttle....

I was wondering about wiring in a 800ohm resistor to the curcuit and resetting the RPM to cure this problem? A new TPS is $220, so I would love it as a temp fix for this problem. This would put my tps at 6200 ohms at full throttle, which is alright. All I would need to do is adjust the tps if this works correctly.



-Is the resistance curve on a TPS sensor linear? Will wiring in the resistor somehow skew the curve?

[moremazda]

How where you thinking about wiring that resistor in? By my math you would need a 63kohm resistance in parallel with the tps to get 6.3kohm

[Max777]

Hmm, I don't know what I was thinking when I posted this...I need LESS resistance up top, the resistor thing would only make it higher.:iamwithstupid:

Is there any way to "magically" drop TPS resistance? Or has that technology not been invented yet?

[djmtsu]

Is it possible to wire in a 'clamp' similar to to what an FCD does?

[Max777]

probably, but an FCD is already in the price range of a good used TPS. I think I will try a used TPS and see.

[RotaryProphet]

First, check your -voltage-. The ECU pumps +5vdc through the TPS, and reads the result. If the voltage is very high, check your TPS ground. If it's very low, check your TPS +5v wire.

Lastly, if you need to lower the resistance, take the two wires you're trying to lower resistance between and add a resistor between them. With two electrical paths to follow, resistance will drop. If you have 7k resistance and add a 7k resister bypassing the TPS, you'll get 3.5k. Google will reveal the math to calculate the exact resister to change the peak to where you want it.