My story,
1) Mid Aug, Sensor reading 98 psi steady, no fluctuation. Did some research and replaced sensor with Amazon sensor.
a) about 1 week later, noticed oil leak. I figured I broke the sensor or something as the sensor now read 0 psi.
b) purchased oil cooler from Amazon.
2) Mid September, replaced oil cooler. Leak worsened.
a) removed cooler and found pinched oring on pressure port between engine and cooler (front driver side), replaced Oring.
b) Oil pressure good, still leaking,
c) Removed and replaced seal with seal kit from Quadratec.
d) Still leaking, More research. Someone suggested a Mopar cooler.
e) ordered Mopar cooler on Amazon, it came in a Mopar box. The only difference between the two is a molding ridge on the external of the pressure port, though it was very small. It was also above the Oring so it shouldn't have mattered.
f) Leak fixed and oil pressure working as noted. 85 psi cold or about about 3500 rpm. Oil Pressure about 35 at highway speeds.
3) Early December, Oil pressure sensor at 98psi again no fluctuation. More research, purchased sensor over the counter from dealership. All good.
4) Mid December, Oil pressure at 98 psi, this time I was able to watch it go. Got in the jeep, OP around 45-50 at 140 degrees. OP started climbing after a bit to 98. When cold and you rev the engine oil pressure LOWERS!! Till engine warms up then at 98.
a) bought 20day subscription to online manuals that show troubleshooting and actual wiring of the PINS and harnesses. The sensor is power by 5VDC, the center pin is the signal with about .3VDC being 0psi and 4.7VDC being top range. I found that the signal wire at the plug had 4.8VDC with the ignition on. I checked for a short in to harness to the +5VDc pin of the plug. It was good. I checked for an open ground, none. I disconnected the plug to the ECM and the voltage would go to OVDC. I found the INPUT PIN on the ECM and found 4.8VDC at that pin. THIS IS AN INPUT PIN, THERE SHOULD NEVER BE VOLTAGE EXCEPT FROM THE SENSOR.
b) I ordered a new PCM from Flagship which will be in by weeks end and that will be an easy test.
All told I've had the top of the engine off 3 or 4 times. The Mopar branded cooler didn't leak and this sensor has been verified to be operation on my test bench. The other may or may not have been bad. I never tested them because I couldn't verify the PINOUT. I've used AMAZON parts as well as dealership. I will know more soon.
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