22re Injector/ECU issue
#1
22re Injector/ECU issue
I have a head scratcher of an issue!!
My 1988 4Runner is only running on two cylinders. I have been working this for a while and will start with the troubleshooting I have found applicable.
Using the noid light, I have discovered cylinders 2+4 are not getting signal to fire the injectors. I have ohmed out the wires to the ECU and found them good. I Ohmed out the wires to the resistor, good. Ohmed out the resistor, 3.0 Ohms, good. All readings were taken on all 4 injector plugs. THis tells me (presumably) that all my wiring is good and my resistor is good.
I swapped my ECU for other 89661-35110 ECU's I have on hand. NO CHANGE!! WTF AM I MISSING??? Sill only getting noid light on 1+3.
Cross posting this to other groups to see if anyone can point me in the right direction.
My 1988 4Runner is only running on two cylinders. I have been working this for a while and will start with the troubleshooting I have found applicable.
Using the noid light, I have discovered cylinders 2+4 are not getting signal to fire the injectors. I have ohmed out the wires to the ECU and found them good. I Ohmed out the wires to the resistor, good. Ohmed out the resistor, 3.0 Ohms, good. All readings were taken on all 4 injector plugs. THis tells me (presumably) that all my wiring is good and my resistor is good.
I swapped my ECU for other 89661-35110 ECU's I have on hand. NO CHANGE!! WTF AM I MISSING??? Sill only getting noid light on 1+3.
Cross posting this to other groups to see if anyone can point me in the right direction.
#2
these trucks have a history of injector wiring splices that corrode and break, to the point where they can't carry enough current to fire the injector: https://forum.ih8mud.com/threads/a-2...-i-had.311436/
there might be a couple of wires still connected so it passes a low-current ohmmeter resistance test, but can't actually fire the injector... my '86 had it, what a nightmare to troubleshoot, not sure if toyota was still splicing with the '88 and up.
it's a last-ditch effort because you have to cut the harness open to find it :-/ if you can locate a used engine harness for your '88 it might be worth trying that first, then fix the old one if that's the problem.
there might be a couple of wires still connected so it passes a low-current ohmmeter resistance test, but can't actually fire the injector... my '86 had it, what a nightmare to troubleshoot, not sure if toyota was still splicing with the '88 and up.
it's a last-ditch effort because you have to cut the harness open to find it :-/ if you can locate a used engine harness for your '88 it might be worth trying that first, then fix the old one if that's the problem.
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old87yota (09-20-2024)
#3
YT Community Team
There is that resistor mounted on the right inner fender wall that controls the fuel injectors, and I believe in pairs. It'll have a part number printed on it thats something like 28515-xxxxx. It has two different connectors coming off it.
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surfin cj7
86-95 Trucks & 4Runners
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04-21-2012 10:23 AM