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1G Oddly grouped ground wires to ECU

Posted by Uncle Jacks Hands, Sep 19, 2019

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  1. Uncle Jacks Hands

    Uncle Jacks Hands Probationary Member

    17
    3
    Joined Sep 10, 2019
    Pittsburgh, Pennsylvania
    I discovered a couple ground wires that look to be tied together very oddly on my ecu. It looks like two of them (these two are the non coated silver ones) were connected to both the white wire for the O2 sensor (pin4) and the det sensor (pin 9) tied together along with 2 other black wires one from the o2 sensor loom and the other from somewhere else, and lastly there is a lone back with red stripe wire hanging out trimmed to the same length but not attached. Any insight on these wires and whether they need to be attached to anything? The only open pin whole in the ECU is the ABS pin 11. I will post the pictures from my phone right after this. I appreciate the help!
     

    Attached Files:

    Street Build 122  2

    1991 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM
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  2. MJcanada

    MJcanada Proven Member

    2,144
    48
    Joined Jun 25, 2011
    campabello, South Carolina
    Looks like someone was trying or did have something added in picking on the signals from those wires. Just reconnect them according to the factory schematic
     

    1K  0

    1995 Mitsubishi Eclipse GST
    manual · 2G DSM
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  3. DogWhistle

    DogWhistle Proven Member

    368
    161
    Joined Sep 13, 2012
    St. Paul, Minnesota
    The two wires (cables) that have a white wire, a black wire, and a silver shield coming out of them are for the engine sensors.

    The two white wires run into the ecu. They are for the signal. The black wires tie together and are spliced (the grey tape with a clear plastic sleeve is factory) to go to the ecu “sensor ground” pin.

    The fact that your white wire was nutted back together looks like a previous owner disconnected the sensor (generally it is the rear O2) to connect a gauge routed input into the ecu.

    It would be better to solder that splice, rather than risk the cap from coming loose, but at least it looks to be connected correctly.
     

    Drag Race Build 545  3

    1999 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM

    2K  6

    1999 Mitsubishi Eclipse Spyder N/T
    fwd · automatic · 2G DSM

    2K  0

    1991 Mitsubishi Mighty Max
    manual · 4G63t Swapped

    3K  6

    1996 Eagle Talon TSi AWD
    385 whp · 378 lb/ft · 2G DSM
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  4. Uncle Jacks Hands

    Uncle Jacks Hands Probationary Member

    17
    3
    Joined Sep 10, 2019
    Pittsburgh, Pennsylvania
    Thank you for the responses. Yes I agree about soldering, I am just waiting until I get everything dialed in and finalized before I do the finishing touches on the wiring. So just to confirm that everything there looks ok and it is nothing I need to concern myself with. Even with the non connected black wire with red striped? Thank you for your help.
     

    Street Build 122  2

    1991 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM
    Loading...
  5. DogWhistle

    DogWhistle Proven Member

    368
    161
    Joined Sep 13, 2012
    St. Paul, Minnesota
    Black with Red tracer is going to be power to the ecu, both on pin #12 and pin #25. Check it with a volt meter first, both with the ignition Off, and then with the ignition On.

    Check your ecu plug and see if one of those wires is missing or clipped off.
     

    Drag Race Build 545  3

    1999 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM

    2K  6

    1999 Mitsubishi Eclipse Spyder N/T
    fwd · automatic · 2G DSM

    2K  0

    1991 Mitsubishi Mighty Max
    manual · 4G63t Swapped

    3K  6

    1996 Eagle Talon TSi AWD
    385 whp · 378 lb/ft · 2G DSM
    Loading...
  6. tk106

    tk106 Supporting Member

    1,442
    308
    Joined Sep 11, 2017
    Cincinnati, Ohio
    People using those twist connectors on cars should be taken out back and beaten with a rubber dildo!
     

    121  3

    2000 Jeep Cherokee Sport - Classic
    awd · automatic · Misc Vehicles

    119  4

    93 Civic 4 Door -sold-
    fwd · manual · Misc Vehicles

    Street Build 2K  6

    1992 Eagle Talon TSi AWD
    12.625 @ 111.42 · 1G DSM
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  7. DogWhistle

    DogWhistle Proven Member

    368
    161
    Joined Sep 13, 2012
    St. Paul, Minnesota

    Drag Race Build 545  3

    1999 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM

    2K  6

    1999 Mitsubishi Eclipse Spyder N/T
    fwd · automatic · 2G DSM

    2K  0

    1991 Mitsubishi Mighty Max
    manual · 4G63t Swapped

    3K  6

    1996 Eagle Talon TSi AWD
    385 whp · 378 lb/ft · 2G DSM
    Loading...
  8. Uncle Jacks Hands

    Uncle Jacks Hands Probationary Member

    17
    3
    Joined Sep 10, 2019
    Pittsburgh, Pennsylvania
    So yeah, I was referencing the pinout sheet the whole time, Its just odd there isn't any open pins or doesn't look like anything missing on the plug side. Its just a couple ground wires then another black wire with red striping that I cant figure out where it comes from or where it is supposed to be attached.
     

    Street Build 122  2

    1991 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM
    Loading...

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