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Old 06-25-2010, 06:27 PM   #1
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TPS Ranges (%, Volts and Ohms)

My jeeps been periodically acting sluggish (slow acceleration) and I've been looking into it. I connected my scanner today and noticed that the absolute throttle position is no less than 12.5% when the foot is off the pedal and 75.5% at WOT. Does anyone know if this is the correct range? It looks fishy to me, I know the values won't be cut and dry at 0/100, my Saturn's TPS would report about 5-95%. Does anyone know the range in ohms that the TPS should have? My FSM says the voltage should be .26 to 4.49v

I've also read that the IAC could cause issues with the TPS and MAP, could this effect this parameter?

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Old 06-26-2010, 09:44 AM   #2
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I'm going to do a few more tests today and probably just replace the TPS...

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Old 06-26-2010, 09:55 AM   #3
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My manual for my 2000 says off-idle at .06 volts and 2.608 volts at WOT.
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Old 06-27-2010, 05:36 PM   #4
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Long story, got a TPS for an 02 from AZ and the electrical connector wasn't keyed right. Brought it back and they gave me one from an 03 model. The connector fits but I'm skeptical about its operation and my scanner is reading 11% to 69% for throttle position. Can anyone confirm this kind of measurement is accurate on a scanner? Also, what would be the best way to measure the voltage coming off of the TPS with a volt meter?
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Old 06-27-2010, 06:58 PM   #5
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On my old Dakota, you would probe the middle wire and ground with the ignition on and engine NOT running to get your voltage readings...might be the same with the Jeep if the TPS has a 3-wire TPS sensor.
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Old 06-27-2010, 07:17 PM   #6
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Any comments on where I could physically insert the probe in terms of the connector/wires? The connector seems to have no bare wire to probe (waterproof connectors) while it's plugged in and the TPS needs that 5v reference from the connector
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Old 06-27-2010, 07:21 PM   #7
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What I did on my old Dakota was I had to force the probe inside the little rubber boot on the connector where the wire enters the connector (forced it in between the wire and the rubber boot/insulator...being careful not to rip anything)...when I forced it in, it made contact in there and worked enough to get the readings I needed.
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Old 06-27-2010, 07:27 PM   #8
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Thanks for the info, I'll poke around and see what I can do, maybe I'll use a needle too. I'm hoping that the voltage measurements are all there but my scanner software is just glitchy.
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Old 06-27-2010, 08:29 PM   #9
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Ended up inserting some very thin gauge wire I had lying around into the connector before placing it onto the TPS. Worked great. I measured .578 to 3.532v from idle to WOT while the key was in the "ON" position. This indicates that my scanner was right and that the new TPS I bought along with the old TPS I had are probably the wrong type. Does anyone recommend a certain brand I can grab from rockauto or elsewhere? I'm very curious to see the difference in operation once I get this sorted out...

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