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Fuel supply shut off after a near accident, and the fuel pump tests fine. Seems like an inertia switch, or Circuit Open Relay got triggered, but I cannot find it anywhere. All relays that I'm finding are testing fine. Truck just cranks but fuel is not getting to the fuel rail, so engine doesnt run.
Did you look behind the passenger side kick panel, above the ECU that's there? I don't know about the '01 Taco, not for sure, but Toyota likes to put it over there. It's a very important part, stopping the fuel flow immediately the engine stops. It doesn't get "tripped" in the event of an accident, though. Honestly it get's "tripped" when the engine starts up. It has 2 halves, the first provides the fuel pump power when the truck cranks for starting, and the other half once the engine fires off, it provides power to the fuel pump while the engine is running.
The first half is energized when the key is in "START". It allows power to the fuel pump, permitting the fuel to the fuel rail, allowing the engine to start up. Once the engine starts, and the key is in "ON", the second half allows power to the fuel pump, permitting the engine to keep on running. If the engine stops, the COR immediately stops the power to the fuel pump. On the trucks I know, it uses the MAF being open to sense that the engine is running, and allows power to the fuel pump.
When mine went bad in an 87 4Runner I had, I found it by turning the key to start, but not pressing the clutch in, or the famous Clutch Start Cancel button. I cold easily hear the fuel pump running, normally. When it went bad, I could no longer hear the fuel pump running when the key was in start. If you have a manual trans, you can try the same trick.
Alternatively, you can just replace it, and see what happens. It's a bit expensive, about $60.00 IIRC, but it sounds like that's the problem. Presuming the wiring to the fuel pump is good. It's known for corrosion, however, so check it carefully.
Yes, I pulled all the plastic panels I can and dont see the circuit opening relay that is depicted in the service manual. See attached photos of the passenger kick panel side, and the area in front of the center console, where I think the ECU is?
10-03-2024, 01:06 PM
