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ECU question

Old 04-03-2019, 01:26 AM
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ECU question

Have a 1986 Toyota pickup sr5 2WD with a Ecu part number 89661-35060 Pretty sure no longer works, will a 1987 pickup sr5 4WD Ecu part number 89661-35080 work? Or does the part number have to be the same? TIA
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Old 04-03-2019, 10:04 AM
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Welcome!

If it were my truck, I would use the same ECU part number that came with the truck.

I would like to back up a moment and ask, why do you think your ECU is bad?

I just want to make sure you are not trying to replace an ECU that is actually just fine.

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Old 04-03-2019, 11:48 AM
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Toyota says .... Maybe. https://parts.lakelandtoyota.com/p/_...966135080.html
(click on "what this fits.") Even though this computer will fit "a" 1986 Toyota pickup SR-5, there is the possibility that the different part numbers are significant for other reasons. I have no idea how to determine this.

I'll echo old87yota's comment. The FSM diagnostics always list a bunch of issues, then end with "faulty ECM." But these were written for working on brand-new vehicles, that only rarely had wiring problems, and occasionally had "infant death" of the electronics. If your ECM has made it to 30 years, it's almost certainly fine. Your wiring, on the other hand, is probably pretty sketchy.

Take a step back and be sure your diagnosis has looked at the more likely issues for a truck of your vintage.
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Old 04-04-2019, 04:10 PM
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Originally Posted by scope103 View Post
I'll echo old87yota's comment. The FSM diagnostics always list a bunch of issues, then end with "faulty ECM." But these were written for working on brand-new vehicles, that only rarely had wiring problems, and occasionally had "infant death" of the electronics. If your ECM has made it to 30 years, it's almost certainly fine. Your wiring, on the other hand, is probably pretty sketchy.
Take a step back and be sure your diagnosis has looked at the more likely issues for a truck of your vintage.
THIS!!! ^^^ Toyota parts are bullet-proof...
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