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

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Old 05-31-2014, 10:54 PM   #1
bwaynep [OP] bwaynep is offline
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1998 Prerunner 3rz - Fuel/ECU issue(s)

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.
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Old 06-01-2014, 11:43 AM   #2
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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.
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Old 06-05-2014, 08:41 PM   #3
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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?
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Old 06-06-2014, 04:40 PM   #4
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Fuel filter?
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Old 06-06-2014, 09:01 PM   #5
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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.
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Old 08-11-2014, 06:26 PM   #6
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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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