Malibu 2001-2005

Oil Pressure Sensor

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Removal & Installation



2.2L Engine
  1. Disconnect the negative battery cable.
  2.  
  3. Raise and support the vehicle.
  4.  
  5. Disconnect the engine oil pressure sensor electrical connector.
  6.  
  7. Remove the engine oil pressure sensor.

    Click image to see an enlarged view

    Fig. The removal and installation of the oil pressure sensor

  8.  

To install:

  1. Install the engine oil pressure sensor, and tighten the oil pressure switch to 16 ft. lbs. (22 Nm).
  2.  
  3. Connect the engine oil pressure sensor electrical connector.
  4.  
  5. Lower the vehicle.
  6.  
  7. Connect the negative battery cable.
  8.  

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Raise and support the vehicle.
  6.  
  7. Disconnect the engine oil pressure sensor electrical connector.
  8.  
  9. Remove the engine oil pressure sensor.

    Click image to see an enlarged view

    Fig. The removal and installation of the oil pressure sensor

  10.  

To install:

  1. Install the engine oil pressure sensor, and tighten the oil pressure switch to 16 ft. lbs. (22 Nm).
  2.  
  3. Connect the engine oil pressure sensor electrical connector.
  4.  
  5. Lower the vehicle.
  6.  
  7. Connect the negative battery cable.
  8.  

3.1L Engine
  1. Turn OFF the ignition.
  2.  
  3. Raise the vehicle.
  4.  
  5. Disconnect the electrical connector from the engine oil pressure sensor.
  6.  
  7. Remove the engine oil pressure sensor.

    Click image to see an enlarged view

    Fig. The removal and installation of the oil pressure sensor

  8.  

To install:


NOTE
Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  1. Install the engine oil pressure sensor, and tighten the oil pressure sensor to 12 ft. lbs. (16 Nm).
  2.  
  3. Connect the electrical connector to the engine oil pressure sensor.
  4.  
  5. Lower the vehicle.
  6.  

3.5L Engine
  1. Disconnect the battery negative cable from the battery.
  2.  
  3. Remove the electrical connector from the engine oil pressure sensor.
  4.  
  5. Remove the engine oil pressure switch.

    Click image to see an enlarged view

    Fig. The removal and installation of the oil pressure sensor

  6.  

To install:

  1. Install the engine oil pressure switch, and tighten the switch to 12 ft. lbs. (16 Nm).
  2.  
  3. Install the electrical connector to the engine oil pressure switch.
  4.  
  5. Connect the battery negative cable to the battery.
  6.  

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect the battery negative cable from the battery.
  4.  
  5. Remove the oil pressure sensor heat shield bolts and shield if required.
  6.  
  7. Remove the electrical connector from the engine oil pressure sensor.
  8.  
  9. Remove the engine oil pressure switch.

    Click image to see an enlarged view

    Fig. The removal and installation of the oil pressure sensor

  10.  

To install:

  1. Install the engine oil pressure switch, and tighten the switch to 12 ft. lbs. (16 Nm).
  2.  
  3. Install the electrical connector to the engine oil pressure switch.
  4.  
  5. Install the oil pressure sensor heat shield bolts and shield if required. Tighten bolts to 89 inch. lbs. (10 Nm).
  6.  
  7. Connect the battery negative cable to the battery.
  8.  

Testing



  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. With the vehicle on a level surface, allow adequate drain down time of 2-3 minutes and measure for a low oil level. Add the recommended grade engine oil and fill the crankcase until the oil level measures full on the oil level indicator.
  4.  
  5. Run the engine, and verify low, or no oil pressure on the vehicle gage or light.
  6.  
  7. Listen for a noisy valve train or a knocking noise.
  8.  
  9. Inspect for the following:

    Oil diluted by moisture or unburned fuel mixtures
     
    Improper oil viscosity for the expected temperature
     
    Incorrect or malfunctioning oil pressure sender
     
    Incorrect or malfunctioning oil pressure gage
     
    Plugged oil filter
     
    Malfunctioning oil bypass valve
     

  10.  
  11. Remove the oil pressure sender or another engine block oil gallery plug.
  12.  
  13. Install special tool J21867-850 and an oil pressure gage and measure the engine oil pressure.
  14.  
  15. Compare the readings to specifications.
  16.  
  17. If the engine oil pressure is below specifications, inspect the engine for one or more of the following:

    Oil pump worn or dirty
     
    Oil pump-to-engine front cover bolts loose
     
    Oil pump screen loose, plugged, or damaged
     
    Oil pump screen O-ring seal missing or damaged
     
    Malfunctioning oil pump pressure regulator valve
     
    Excessive bearing clearance
     
    Cracked, porous or restricted oil galleries
     
    Oil gallery plugs missing or incorrectly installed
     
    Broken lash adjusters
     

  18.  

2.2L Engine
  1. With the vehicle on a level surface, allow adequate drain down time of 2-3 minutes and measure for a low oil level. Add the recommended grade engine oil and fill the crankcase until the oil level measures full on the oil level indicator.
  2.  
  3. Run the engine, and verify low, or no oil pressure on the vehicle gage or light.
  4.  
  5. Listen for a noisy valve train or a knocking noise.
  6.  
  7. Inspect for the following:

    Oil diluted by moisture or unburned fuel mixtures
     
    Improper oil viscosity for the expected temperature
     
    Incorrect or malfunctioning oil pressure sender
     
    Incorrect or malfunctioning oil pressure gage
     
    Plugged oil filter
     
    Malfunctioning oil bypass valve
     

  8.  
  9. Remove the oil pressure sender or another engine block oil gallery plug.
  10.  
  11. Install special tool J21867-850 and an oil pressure gage and measure the engine oil pressure.
  12.  
  13. Compare the readings to specifications.
  14.  
  15. If the engine oil pressure is below specifications, inspect the engine for one or more of the following:

    Oil pump worn or dirty
     
    Oil pump-to-engine front cover bolts loose
     
    Oil pump screen loose, plugged, or damaged
     
    Oil pump screen O-ring seal missing or damaged
     
    Malfunctioning oil pump pressure regulator valve
     
    Excessive bearing clearance
     
    Cracked, porous or restricted oil galleries
     
    Oil gallery plugs missing or incorrectly installed
     
    Broken lash adjusters
     

  16.  

3.1L & 3.5L Engines
  1. If the vehicle has low oil pressure complete the following steps:


  2.  
  3. Inspect the oil level.
  4.  
  5. Raise and support the vehicle.
  6.  
  7. Remove the oil filter.
  8.  
  9. Assemble the plunger valve in the large hole of the special tool J25087-C base. Insert the hose in the small hole of the J25087-C base. Connect the gauge to the end of the hose.
  10.  
  11. Insert the flat side of the rubber plug in the bypass valve without depressing the bypass valve.
  12.  
  13. Install the J25087-C on the filter mounting pad.
  14.  
  15. Start the engine.
  16.  
  17. Inspect the overall oil pressure, the oil pressure switch, and for noisy lifters. Ensure that the engine is at operating temperature before inspecting the oil pressure. For the 3.1L engine, the oil pressure should be approximately 60 psi (414 kPa) at 1,850 RPM using 5W-30 engine oil. For the 3.5L engine, the oil pressure should be approximately 60 psi (414 kPa) at 1,850 RPM using 5W-30 engine oil.
  18.  
  19. If adequate oil pressure is indicated, test the oil pressure switch.
  20.  
  21. If a low reading is indicated, press the valve on the tester base in order to isolate the oil pump and/or its components from the lubricating system. An adequate reading at this time indicates a good pump and the previous low pressure was due to worn bearings, etc.
  22.  
  23. A low reading while pressing the valve indicates a faulty pump.
  24.  

 
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