2000TJ What is the sensor above the oil filter???? - Jeep Wrangler Forum
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Old 09-21-2007, 09:48 PM   #1
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2000TJ What is the sensor above the oil filter????

What is the small sensor above the oil filter? It has a connector with one wire and the sensor has a metal strap that's attached directly to the engine block. It's located above the oil filter on the 4.0 engine. I noticed that mine was broken off, but looks like it has been for a long time (the metal strap rusted thru). I also can't figure out how to get the bolt out that holds it on because it appears to have some kind of plastic cap on it. Any idea what it is? Could it be making my check engine light come on and stay on, even without starting the engine? That's what's happening now.

Thanks,
Bill...

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Old 09-21-2007, 09:53 PM   #2
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Do your gauges show you have oil pressure? Cause it sounds like the oil pressure sensor.

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Old 09-21-2007, 09:53 PM   #3
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do you mean no. 3 or no. 4?

3 = oil pressure sensor
4 = camshaft position sensor

sorry i only found these YJ 4.0 pics, but it must be nearly the same.

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Old 09-21-2007, 10:04 PM   #4
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It's not either one of those. There is a cable run that runs along the right side of the block, including the Crank Sensor. The cable is attached to the block at various points. This sensor is attached under one of the mounting points and has a 2 pin connector on it, with only one green wire in the connector. I can't find it anywhere in the shop manual.

I noticed it was broken as I was looking to install an oil cooler, (not done yet).

I changed my coolant as well as my hoses and belt and now the check engine light is on, even before the engine is started.
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Old 09-21-2007, 10:16 PM   #5
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Here are some pics of the sensor. The metal tab/strap is broken off right at the sensor, it is still attached to the engine.
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Old 09-22-2007, 09:06 AM   #6
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From your description I think you are talking about the "Ignition coil capacitor". I believe they are a dealer only part but I might be wrong.
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Old 09-22-2007, 09:22 AM   #7
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More Pics

Thanks, I'm taking the pics to the dealer to see what they say. I've attached a couple of pictures showing where it was attached.
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Old 09-22-2007, 09:36 AM   #8
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Yeh I'm pretty sure thats it. One green wire probably with a different color green stripe. Black plastic peice that looks like something from a computer with a metal piece coming out of it that bolts to the bottom of the head. That plastic piece you have pictured on the stud there is just a lock down point for the wire loom. If I remember correctly that stud is the grounding spot for the capasitor and nothing more. The wire loom lock snaps in place on the stud after the capasitor is bolted in place.

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