Lexus Car ES, IS, LS 1998-06

Oil Pressure Sensor

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Removal & Installation



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

    Click image to see an enlarged view

    Fig. Oil pressure sending unit

    6.  

To install:

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

  1. Before servicing the vehicle, refer to the Precautions section.
    2.  
  2. Disconnect the negative battery cable. Wait at least 90 seconds before performing any other work
    3.  
  3. Remove the engine under cover(s), if necessary.
    4.  
  4. Disconnect the oil pressure switch connector, located on the side of the engine block.
    5.  
  5. Remove the oil pressure switch.
    6.  

To install:

Click image to see an enlarged view

Fig. Applying adhesive to the oil pressure switch.

  1. Apply adhesive (Part No. 08833-00080, THREE BOND 1344, LOCTITE 242 or equivalent) to 2 or 3 threads of the oil pressure switch.
    2.  
  2. Install the oil pressure switch.
    3.  
  3. Connect the oil pressure switch connector.
    4.  
  4. Install the engine under cover(s), if necessary.
    5.  
  5. Connect the negative battery cable.
    6.  
  6. Start the engine and check for engine oil leaks.
    7.  

Testing





Click image to see an enlarged view

Fig. Checking oil pressure switch for continuity.

  1. Check oil pressure switch continuity as follows:


    1. Disconnect the connector from the switch.
      2.  
    2. Check that continuity exists between terminal and ground with the engine stopped.
      3.  
    3. Check that no continuity exists between terminal and ground with the engine running.
      NOTE
      Oil pressure should be over 3.55 psi (24.5 kPa).

      4.  
    4. If operation is not as specified, replace the switch.

      Click image to see an enlarged view

      Fig. Checking oil pressure with an oil pressure gauge-LS 430 shown

      5.  

    2.  
  2. Inspect the engine oil level.
    3.  
  3. After warm up the engine and then 5 minutes after the engine stop, oil level should be between the low level and full level marks of the dipstick. If low, check for leakage and add oil up to the full level mark.
    4.  
  4. Disconnect the oil pressure switch connector.
    5.  
  5. Remove the oil pressure switch.
    6.  
  6. Install an oil pressure gauge.
    7.  
  7. Start the engine. Shut it off immediately if the gauge registers no oil pressure. Repair the problem before continuing.
    8.  
  8. Allow the engine to warm up to normal operating temperature.
    9.  
  9. The pressure should register:

    ES 300: at idle 4.3 psi (29 kPa); at 3000 rpm 43-78 psi (294-539 kPa)
     
    ES 330: at idle 4.3 psi (29 kPa); at 3000 rpm 36-78 psi (245-539 kPa)
     
    IS 300: at idle 7 psi (49 kPa); at 3000 rpm 47 psi (324 kPa)
     
    IS 250 and IS 350: at idle 11.6 psi (80 kPa); at 3000 rpm 55.5 psi (380 kPa)
     
    LS 400: at idle 4.3 psi (29 kPa); at 3000 rpm 43-85 psi (294-588 kPa)
     
    LS 430: at idle 4.2 psi (29 kPa); at 3000 rpm 43-85 psi (294-588 kPa)
     

    10.  
  10. If oil pressure is within specifications, replace the oil pressure switch and recheck.
    11.  
  11. If oil pressure is not within specifications, inspect the oil pump.
    12.  
  12. Remove the oil pressure gauge
    13.  
  13. Apply adhesive to 2 or 3 threads of the oil pressure switch and install.
    14.  
  14. Connect the oil pressure switch connector.
    15.  
  15. Start the engine and check for leaks.
    16.  

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