Setting TPS 1997 Pathfinder

[A1218]

I am trying to adjust a new tps sensor on the pathfinder. Got back a new Hitachi TPS.

I am following the service bulletin procedure.

I warmed up the engine and checked that the throttle drum sits against the stop screw when the Fast Idle Cam releases. I put probes of the multimeter using the ohm setting in the correct pins according to instructions. Now when I check with the feeler gauge 0.012 I am supposed to get a reading of “O” ohms. I don’t get that when maneuvering the sensor at all. I get around 27.

On the next step using 0.016 feeler gauge I am supposed to get a reading of “OL”. I don’t get that however I can get to 1 which is the same thing as OL according to what I’ve read.

I reset the idle memory by doing the key cycle procedure. Started up and it idles fine and drives fine.

I am honestly using a very cheap multimeter so maybe it doesn’t provide the same type of reading?

Should I have put the multimeter in continuity mode instead?

[VStar650CL]

You're confused, OL and 1 are diametrically opposite. OL means the resistance is too high to read, above 10,000,000 ohms for most VOM's. Basically an open circuit. On the other hand, for the amount of signal current used by a TPS, 1 ohm is basically the same as 0 ohms, a closed circuit. If the vehicle runs well despite that, I have to think your meter was funking up.

[A1218]

You're confused, OL and 1 are diametrically opposite. OL means the resistance is too high to read, above 10,000,000 ohms for most VOM's. Basically an open circuit. On the other hand, for the amount of signal current used by a TPS, 1 ohm is basically the same as 0 ohms, a closed circuit. If the vehicle runs well despite that, I have to think your meter was funking up.

So what readings should I be looking for when setting the tps?

Would using the continuity setting work as well?

[VStar650CL]

I can't explain the readings you were getting, you should be seeing more or less what the SM calls for. The continuity setting will still give you a reading but uses higher current, so you need to be cautious about it when testing any wire that might connect to an ECU. For measuring the TPS pins with the connector loose, there's no harm in whatever setting you use, because you're only putting current through the sensor itself.

[A1218]

Well the service manual calls for 0.3V-0.7V for the TPS, but there was a TSB released that uses feeler gauges and ohms to set it. I am testing directly on the TPS sensor using pins 5 and 6 on the CTPS side.

Here's the link: http://lyberty.com/car/Maxima_A32_docs/ ... 9-053b.pdf

I saw a video over at NPORA by a member on setting it using the TSB instructions. This individual also does not get "O" or "OL" readings as stated in the TSB, but gets low ohm reading using the 0.012 feeler gauge and a reading of "1" using the 0.016 feeler gauge. This individual states that this is the correct adjustments.

When I put back on the old TPS this evening and adjusted it, using the 0.012 feeler gauge I got a reading of 16.9 ohms and a reading of "1" using the 0.016 feeler gauge. Similar to the NPORA member and the TPS is relatively centered in the end. However, using the new TPS sensor, I get the "1" reading using the 0.016 feeler gauge, but the 0.012 feeler gauge ends up showing a reading of 145 ohms. And with the new TPS with those readings it ends up being about all the way on one side almost.

https://imgur.com/a/SwlhUaD

With the adjustments made back to the old sensor and the throttle position sensor idle position memory reset by cycling the key, vehicle is operating properly. It was also operating fine after using the new sensor too, so I'm not sure what's up with the adjustment measurements.

Could the new sensor be wacky or because it is new it will read differently than the old one?

I'm sorry if all of this is not making sense but I am trying the explain the best way I can based of what I am experiencing by following the TSB.

[VStar650CL]

I dunno, does your ohmmeter maybe use a "1" to indicate over-range? I.e., less than the maximum 10M but bigger than the current range selected? If so, that would make sense. Otherwise, I don't get it.

[mdmellott]

Should I have put the multimeter in continuity mode instead?

I would. That service bulletin is only calling for closed loop (continuity) or open loop (OL, no continuity) checks to be made. Resistance measurements can make this basic continuity check confusing.

[MisterH]

You're confused, OL and 1 are diametrically opposite. OL means the resistance is too high to read, above 10,000,000 ohms for most VOM's. Basically an open circuit. On the other hand, for the amount of signal current used by a TPS, 1 ohm is basically the same as 0 ohms, a closed circuit. If the vehicle runs well despite that, I have to think your meter was funking up.

So what readings should I be looking for when setting the tps?

Would using the continuity setting work as well?

I found this explanation for setting the TPS range most helpful. Keep in mind the range for the specified setting is less than 1 ohm so set your meter accordingly:

https://troubleshootmyvehicle.com/nissa ... switch-1#2