Liberty, Wrangler, 1997-2005

Oil Pressure Sensor

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Operation



The 3-wire, electrical/mechanical engine oil pressure sensor (sending unit) is located in an engine oil pressure gallery.

The oil pressure sensor uses three circuits. They are:



A 5 volt power supply from the Powertrain Control Module (PCM)
 
A sensor ground through the PCM-s sensor return
 
A signal to the PCM relating to engine oil pressure The oil pressure sensor has a 3 wire electrical function very much like the Manifold Absolute Pressure (MAP) sensor. Meaning different pressures relate to different output voltages.
 

A 5 volt supply is sent to the sensor from the PCM to power up the sensor. The sensor returns a voltage signal back to the PCM relating to engine oil pressure.

This signal is then transferred (bussed) to the instrument panel on either a CCD or PCI bus circuit (depending on vehicle line) to operate the oil pressure gauge and the check gauges lamp. Ground for the sensor is provided by the PCM through a low-noise sensor return.

Removal & Installation



  1. Disconnect the negative cable from the battery.
  2.  
  3. Raise vehicle on hoist.
  4.  
  5. Remove front splash shield.
  6.  
  7. Disconnect oil pressure sender connector.
  8.  
  9. Remove the pressure sender.

    Click image to see an enlarged view

    Fig. Oil pressure sending unit

  10.  

To install:

  1. Install oil pressure sender.
  2.  
  3. Connect oil pressure sender wire.
  4.  
  5. Install front splash shield.
  6.  
  7. Lower vehicle.
  8.  
  9. Connect the negative battery cable.
  10.  

 
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