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Thread: ECU Terminal Help

  1. #1
    Forum Newbie Dzhezzi's Avatar
    My Van(s):
    1984 Toyota Van Wagon Le
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    ECU Terminal Help

    Hello All!!

    So I just purchased a 1984 Toyota Van LE model and found a huge rat's nest. I promptly cleaned that up and found that a rat had chewed up a large amount of my wires. I noticed that it chewed through my wires that lead up to the ECU. I disconnected the terminals and now need to fix all this wiring, but I am having a problem identifying what each wire is for, since some have repeated colors. I found the ECU connector pinout with abbreviations that I frankly can't make out and so I can't identify things correctly on the wiring schematic. Since I plan to just solder the wires that got chewed up should there be anything I should be aware of?

    Here is what I am looking at and have figured out a few, but still need help:
    18 pin connector:
    E2 - Ground
    Vs -
    Vc -
    BAT -
    THA - Intake air temperature
    TWS - water temperature switch? The wire is green, but there are two places in the wiring diagram where this can go?
    STA - Starter
    A/C - Air conditioning?
    OX - oxygen sensor (NCA on the wiring diagram?)
    IG - Distributor?
    E3 - Ground
    W - Check engine light
    +B -
    VSV2 -Vacuum switching valve
    SPD - Vehicle speed
    L - throttle valve maybe? Yellow/red wire that leads to the O/D Thermo switch on wiring diagram, but also to the alternator.
    CHG - charge light
    VSV1 - Vacuum switching valve, but the color indicates A/C system?

    12 pin connector:
    THW - Water Thermo sensor?
    IDL - I believe this goes to the throttle position sensor
    Vf - EFI service connector?
    T - Test terminal? Not sure what this means
    NO 10 - Injectors 1 and 3
    E01 - Ground
    E1 - Ground
    TL - I believe this goes to the throttle position sensor
    Psw - I believe this goes to the throttle position sensor
    -
    No 20 - Injectors 2 and 4
    E02 - Ground


    Thanks guys!
    Last edited by Dzhezzi; 07-03-2019 at 10:47 PM.

  2. #2
    Forum Newbie Dzhezzi's Avatar
    My Van(s):
    1984 Toyota Van Wagon Le
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    Jun 2019
    Location
    Los Angeles
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    Re: ECU Terminal Help

    This is the wiring diagram I am using, I have highlighted the ones that I seem to be missing or can't figure out:
    Name:  ECU Wiring.jpg
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