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1998 Prerunner 3rz - Fuel/ECU issue(s)

Discussion in '4 Cylinder' started by bwaynep, May 31, 2014.

  1. May 31, 2014 at 10:54 PM
    #1
    bwaynep

    bwaynep [OP] Member

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    So I went to back the truck out of a parking spot tonight. It started up, went into reverse, rolled about a foot, and died.

    I don't seem to be getting any fuel, no noise from the pump, and the truck isn't starting. No check engine lights.

    I can't pull the codes either. I hooked up my scanner when the issue started, but it's not able to recognize the ECU.

    Any help and/or troubleshooting steps greatly appreciated. I had the truck towed home.
     
  2. Jun 1, 2014 at 11:43 AM
    #2
    bwaynep

    bwaynep [OP] Member

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    Well, I pulled the ECU today and opened it up. No signs of corrosion or shorting. Going to check the fuel pump relay.

    Not sure if it's a sign of ECU failure, or a wiring issue somewhere along the way, but I wasn't getting any "check engine" light when I brought the ignition to the ready state (just before cranking). Between that and the inability to connect to the OBD2 scanner I have, I suspect the ECU threw up on it's shoes.
     
  3. Jun 5, 2014 at 8:41 PM
    #3
    bwaynep

    bwaynep [OP] Member

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    Swapped out with a junkyard ecu ($50), still can't connect via OBD2 port.

    Swapped around the relay for the EFI with relays known to be good, nothing.

    Any ideas? Bump?
     
  4. Jun 6, 2014 at 4:40 PM
    #4
    Fordless

    Fordless Well-Known Member

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    Fuel filter?
     
  5. Jun 6, 2014 at 9:01 PM
    #5
    bwaynep

    bwaynep [OP] Member

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    @Fordless - unlikely as the ECU doesn't seem to be getting power.

    I was able to find a wiring diagram, and the only thing I can think (at this point) is that the circuit opening relay took a dump. If it's beyond that it's somewhere in the wiring, and I'll likely let someone else deal with that (truck has 197k hard miles on it).

    I ordered a new COR, should be here in a week or so. We'll see if that clears things up.
     
  6. Aug 11, 2014 at 6:26 PM
    #6
    bwaynep

    bwaynep [OP] Member

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    Fixed! Fixed! Fixed! Fixed! Fixed!

    Went through the ignition harness after installing the new circuit opening relay. Turns out the PO had installed an alarm (I think) and there was some sub/amp wiring that was loose and didn't seem to be grounded correctly.

    I went through and cut all that crap out, re-soldered the ignition harness, and I'm back in business. Now it's finally time to sell my WRX and get the suspension and camper setup for the truck.
     
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