Question about Isuzu Trooper

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1988 Trooper 2.6L 4ZE1 I have no power going to the Low Pressure Oil switch. where does the LPO switch derive its power from? This happened once before and the low Pressure oil switch was the problem. I replaced the LPOS with a new one and the car ran fine until my wife ran it out of gas after she put gas in the tank the car failed to start and I am not getting any power to the Low pressure oil switch now The Circuit diagram shows it coming from the instrument cell cluster. According to the circuit diagram this switch controls the power to the fuel pump. If I by pass the LPOS with a hot lead to the fuel pump the fuel pump activates and runs.

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  • ErichvS Aug 11, 2008

    I have already replaced the LPOS with a new one
    The problem is that I am not getting any power to the hot side of the switch

  • ErichvS Aug 11, 2008

    I need to find where the primary source of power for the LPOS is derived from.

  • ErichvS Aug 11, 2008

    I know what type of switch it is it requires 4-7 pounds of oil pressure to activate.
    My problem is that I am not getting any power to it. I am looking for the source of power to the switch. Where does the switch get its power from? The cicuit diagram shows it coming from the instrument cluster on the dash.


  • Anonymous Mar 13, 2014

    low pressur fuel

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Hi,

Normally there would be a relay for the fuel pump. It would be among a few others in the fuse/relay box under the hood. Pls confirm with your diagram and to my knowledge, this gets its main power from the FL-3 ECM fuse (30A) and then to the F10 fuel pump fuse (15A). These are all ignition triggered, meaning, there would be +12VDC if and when the ignition switch is turned on.

The Low Pressure Oil sensor is likewise ignition +12 supplied.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Posted on Aug 11, 2008

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It is an electro-magnetic switch valve whereby an oil pressure press is actuated when a desired pressure is attained

Posted on Aug 11, 2008

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It's either the oil pressure switch has gone bad,or the switch and fuel pump are on the same circuit or share a relay.I know the fuel pump has a relay,so check it for looking discolored,burnt,plastic bubbling,indicating a problem with a relay.The switch itself would normally be conducting power through it,and when oil pressure dropped dangerously low,the switch would interrupt the current flow,stopping power to the fuel pump.There may also be a fuel pump reset procedure?I know older Fords,90's cars had a fuel pump circuit reset button,as well as Rangers,etc.You could always take the switch out of the loop,and install a mechanical oil pressure gauge to keep track of the oil pressure.

Posted on Aug 11, 2008

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Italmost sounds as if the switch has gone bad again..maybe from trying to start it too many times after it ran out of gas?? replace the switch again and see if that dosent solve the problem.i believe it will please rate me

Posted on Aug 11, 2008

  • Ronnie Houston Aug 11, 2008

    just a quick fix until you can fix it right run a wire to the ignition fuse in the fuse box. this will allow the fuel pump to come on when the key is turned and shut off when the key is turned off.

    this will let you drive the car until you can figure out what to do to fix it......

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