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1996 Fuel Pump Wiring Diagram or Test Power to Pump

Discussion in '1st Gen. Tacomas (1995-2004)' started by LloydEwing, Oct 11, 2017.

  1. Oct 11, 2017 at 9:12 PM
    #1
    LloydEwing

    LloydEwing [OP] Member

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    Lloyd
    Austin Texas USA
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    Does someone have a wiring diagram for the fuel pump circuits on the 1996 Tacoma (4 cyl)? The fuel pump is not working and I need to find out if power is going to the pump. I found the plug where the wires connect to the top of the tank, but I cannot see it well enough to tell if there is a way to unplug it without lowering the tank.

    I downloaded a copy of the factory repair manual, but I could not find a wiring diagram for the fuel pump circuits. It looks like the 1996 wiring diagrams manual is out of print. The DLC1 Data Link Connector has a slot for the wire that runs to the fuel pump, but it is empty.

    My Tacoma has been sitting for a few years. A mechanic warned me that the fuel pumps often fail when they are not used, but I want to make sure that power is going to the pump before I remove the tank.

    Thanks for any help or suggestions,
    Lloyd
     
  2. Oct 11, 2017 at 9:16 PM
    #2
    Dalandser

    Dalandser ¡Me Gustan Las Taco-mas!

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    Empty Wallet Mod
  3. Oct 11, 2017 at 9:54 PM
    #3
    Glamisman

    Glamisman Well-Known Member

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    it is a simple circuit, the White with black tracer is the ground, the Blue is the +12 volts in. The Blue is only energized when cranking or the engine running.

    The White with red tracer off of the data link connector is powered from the EFI relay throught the 7.5 A IGN fuse. it powers the heater circuits of the O2 sensors, the Mass Air flow sensor etc.
     
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  4. Oct 12, 2017 at 2:02 AM
    #4
    mechanicjon

    mechanicjon They call me "Jonny Stubs"

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    Yes?
    You need something like this?
    1996 fuel pump.jpg
     
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  5. Oct 12, 2017 at 6:12 AM
    #5
    Dalandser

    Dalandser ¡Me Gustan Las Taco-mas!

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    :yes:I'm pretty sure OP needs it more than me :p :thumbsup:
     
  6. Oct 25, 2017 at 9:38 PM
    #6
    LloydEwing

    LloydEwing [OP] Member

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    Lloyd
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    mechanicjon,
    Thanks very much for the diagram! That was exactly what I needed. Also thanks to Glamisman, although I did not understand that post until I saw the diagram. I found the Circuit Opening Relay and was able to measure the voltage there. (I would never have guessed that the relay controlling the fuel pump would be given such a non-descriptive name.)

    In case anyone else reads this thread in the future because they have the same problem, I want to describe how to unplug the electrical wires on the top of the tank. I do not have much previous experience working on Toyota products, so I spent about an hour gently poking and prodding at the plug with various screwdrivers trying to get it to come loose. I finally got it lose, but I ended up breaking it.

    The plug is removed by simply pulling up on the plug while releasing a single catch in the side of the plug. It looks like a small screwdriver is needed to release the catch, and very gentle force is required to keep from breaking the catch. The plug comes off easily after the catch is released.

    From examining the plug, I expected the cover over the wires on the back of the plug to open on hinges so that the plug under it would then be released. That cover over the wires on the back of the plug is permanently attached, even though it yields to gentle pressure.

    Lloyd
     
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