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The zero ohms reading with the engine running sounds suspect to me. Maybe old_man can shed some light on those readings, he is an EE.
should it have any resistance (ohms) when there is voltage running through it? it seems to me that the sensor itself is working as it should since it tests correct when disconnected from the harness.
i have an 89 so i do not have the c101 connector.
i am also not testing the ground to the TPS as i allready know i have a good ground there. i am testing the MAT/IAT sensor and its wiring. i also have tested the sensor disconnected and found it to read correct specs. but when connected to the harness i get a huge increase in ohms. and the ground side of the harness to the MAT is getting zero ohms, which makes me believe the sensor wire itself is either damaged, or there is a fault inside the ECU. i have also swapped to another ECU with no change. not to say the other ECU is not bad also as it came from a non running parts jeep.
I have a HO IAT in my 89 renix. Of course you have to change the pigtail. Its been fine, no problems for over a year.
I'm bumping this thread back to the top. Did anyone ever track down a good part number for the Renix MAT/IAT?
For what it's worth I've pulled two off of really beat, high-mileage junkyard XJs - they were totally clogged/gunked beyond belief, but after a good careful cleaning they both measured right in range (according to the LungHD chart) when I tested them on a hot engine with an IR temp gun. I keep one in my trail spares kit and one saved in the garage. If you're ever wandering through a JY and see one, grab it because it's likely still fine.
For what it's worth I've pulled two off of really beat, high-mileage junkyard XJs - they were totally clogged/gunked beyond belief, but after a good careful cleaning they both measured right in range (according to the LungHD chart) when I tested them on a hot engine with an IR temp gun. I keep one in my trail spares kit and one saved in the garage. If you're ever wandering through a JY and see one, grab it because it's likely still fine.
Yup. Clean them up and put them back in.