SOURCE: serpintine belt
This link will take you to a picture of the diagram. If the link doesn't work contact me and I can email you the picture directly.
http://autorepair.about.com/library/illustrations/bl506a-lib.htm
SOURCE: low oil pressure on 99 jeep grand cherokee
change your oil,it could be too thin,see if that fixes it
SOURCE: 2004 Grand Cherokee: oil pressure fluctuates
if you know for certain that the sending unit is correct and the guage is accurate, then yiu may have big problems.....while the engine is running open the oil filler hole.. is everything wet with oil? or does it look dry or just a little lubed? you can allways install an aftermarket oil pressure guage(crappy tire) if you get the same results with that then you may have a week oil pump....worst case scenerio... need an engine rebuild as the moter may have wear issues.does the pressure slowly drop as the motor warms up? at idle ? does it jump up when you step on the gas?
SOURCE: 1993 Jeep Grand Cherokee, V6. Oil Pressure Gauge Read High.
it could be the sensor you should look at the oil pressure relief valve
SOURCE: Exactly where is oil pressure sending unit located
if you have the 5.2 V8 its located in the rear of the engine near the dist cap area you can see it if you look in that area , if 4.0 6 cyl its located on the side of the engine block near the oil filter area. It has two wires going to it and screws into the block. It's made mainly of plastic and if broken can allow oil under pressure to spew out and give you thoughts of a blown rear main seal due to the amount of oil all over the underside.
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