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    Ford Aerostar 1986-1997 Repair Guide

    Oil Pressure Sending Unit

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    TESTING



    See Figure 1

    This test should be performed if the oil pressure gauge does not show correct oil pressure and the cause is thought to be the sender.

    1. Turn the ignition to the ON position (do not start the engine). Observe the oil pressure gauge.
      1. If the gauge reads L or below, proceed to Step 2.
      2.  
      3. If the gauge reads anything but L or below, the problem lies in the wiring, the gauge itself or the instrument cluster.
      4.  

    2.  





    Click image to see an enlarged view

    Fig. Fig. 1: Oil pressure switch system wiring schematic-1993-96 models

     

    1. Disconnect the oil pressure switch/sender and short the lead to an engine ground.
    2.  

    REMOVAL & INSTALLATION



    The sending unit is located as follows:



    2.3L-Left rear of cylinder head
     
    2.8L-Next to fuel pump
     
    3.0L-In block behind right cylinder head
     
    4.0L-Low left side of block near front
     

    The pressure switch-type unit used with the indicator lamp system is not interchangeable with the variable resistance-type unit called a sender, which is used with the gauge system.

    Installation of the wrong part will result in an inoperative oil pressure indicating system and a damaged switch unit or gauge.

    1. Disconnect the negative battery cable.
    2.  
    3. Remove the inside engine cover.
    4.  
    5. Disconnect the wire at the sending/switch unit.
    6.  
    7. Remove the sending unit from the engine block.
    8.  

    To install:
    1. Wrap the threads of the new sending unit with Teflon® tape and carefully screw it into place. Make sure not to cross-thread the sending unit.
    2.  
    3. Tighten the sending unit to 15 ft. lbs. (20 Nm).
    4.  
    5. Attach the wire to the sending unit.
    6.  
    7. Connect the negative battery cable.
    8.  

     
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