Question about 1999 Jeep Cherokee

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Oil pressure gauge stays at almost max.

What is the normal reading supposed to be? How do you check the sensor? I know that its a dual sensor- fuel and oil. its a 1999 jeep grand cherokee limited. I change the oil on a regular basis

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The oil pressure switch on a 4.0 is on the passenger side of the block toward the back near the firewall. It has a green electrical connector. Take out the sending unit look to see if there are any obstructions. I would replace it they are not exspensive they go bad all the time.

Posted on Jul 11, 2009

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1 Answer

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Oil Pressure Sensor Testing
  1. Check the oil level and correct as necessary. Turn the ignition switch on, but do not start the engine.
  2. Disconnect the sensor lead at the sensor. The gauge should read full scale.
  3. Ground the connector. The gauge should read at the bottom of the scale.
  4. If the gauge functions properly, replace the sensor.

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  1. If necessary, remove the engine sight shield.
  2. Disconnect the oil pressure sensor electrical connector.
  3. Using J 41712 or equivalent, remove the oil pressure sensor.
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Using J 41712 or equivalent, remove the oil pressure sensor.

To install:
  1. Apply sealant to the threads of the oil pressure sensor.
  2. Using J 41712 or equivalent, install the oil pressure sensor.
    • Tighten the oil pressure sensor to 26 ft. lbs. (35 Nm).
  3. Connect the oil pressure sensor electrical connector.
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