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VP Eng-Body loom connectors

Discussion in 'VN - VP Holden Commodore (1988 - 1993)' started by WreckWren, Oct 10, 2018.

  1. WreckWren

    WreckWren New Member

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    Hi all,

    You know those couple plugs in the engine bay near the driver's strut tower?

    I need to know what those wires do in VP vs. VS. Or just what they do in VP.

    Cheers to anyone with the infos
     
  2. EYY

    EYY Well-Known Member

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  3. WreckWren

    WreckWren New Member

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  4. EYY

    EYY Well-Known Member

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    Yes it is
     
  5. WreckWren

    WreckWren New Member

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    Beauty cheers mate
     
  6. WreckWren

    WreckWren New Member

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    Ahh I have a small problem, have some unaccounted and different wires.

    On the black eng bay plug with 6 pins, I have (from left to right, top to bottom looking at the output end of the plug):
    GRN-WHT PNK RED
    RED PNK-BLU VIO

    Anyone know what the pink ones are for? I'm getting a constant 12v draw from the top pink one that's running the battery flat.
     
  7. FXST01

    FXST01 The Grey Man

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    Photo?
     
  8. delcowizzid

    delcowizzid on holiday

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    Pinks are normally switched ignition feeds
     
  9. wildfiremaint

    wildfiremaint Active Member

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    Faulty alarm thats trying to
    constantly charge its internal battery ?
     
  10. WreckWren

    WreckWren New Member

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    Here are some images.

    First two are the car loom end

    Second two are the eng loom end

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]
     
  11. FXST01

    FXST01 The Grey Man

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    Is this any help?
     

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  12. WreckWren

    WreckWren New Member

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    Sadly only minimal help, I have the Gregory's manual for these cars but unfortunately it only shows where wires terminate - not which connectors they pass through on the way, generally speaking.

    I managed to get the full cluster working thanks to old mate's Calaisturbo link above, but still getting that 12v draw on a few of the wires in the plugs near the driver's strut tower.

    At this point I'd already have a battery disconnect installed if the ECU didn't keep forgetting its tune between runs :( Car runs like a turd for the first minute or two of driving, then it's awesome with just a slightly high idle.
     
  13. delcowizzid

    delcowizzid on holiday

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    One pink will be dfi switched ignition power other will be ecu switched ignition to turn it on if its vn
     
  14. delcowizzid

    delcowizzid on holiday

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    One red is constant power to ecu one power to injectors could be orange too they changed the colours up between models
     
  15. EYY

    EYY Well-Known Member

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    I did have it all written down somewhere. I'll post it back here if i can find it. Remember with the VS there is a connector inside the vehicle near the ECU too for constant ECU power, pwr button, trip computer signal, CEL and BCM/aldl data signal.

    From what I remember for VS engine bay connectors off the top of my head:
    -two green wires are A/C related - one is AC request and the other is AC signal
    -brown is tacho signal
    -pink is auto trans ignition +
    -red is EFI relay - + to ignition and injectors
    -blue is oil pressure signal
    -purple is fuel pump relay signal
     
  16. WreckWren

    WreckWren New Member

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    Aha cheers, the shell is a VP.

    OK so if I leave that red for the PCM power always connected but DC the rest it should retain the tune? I'm guessing the **** running just after starting it is caused by the tune being reset but could be something I'm not aware of.

    Considering running that wire straight down to the battery and hooking everything else up to the disconnect switch.

    Ah legend, so you're referring to the little white plug on the engine loom just near the PCM? I actually don't have that hooked up to anything at the moment, so this could explain why the PCM is dropping tunes when turned off. I spose if I find that constant power wire for the flash memory in the PCM, the ****-running-at-start will be fixed?

    Thanks to this thread I now have a working tacho and a smooth running car, just gotta get that idle down and get it to retain the tune then I can work out the rest alone.

    Thanks again for the help fellas, life savers.
     
  17. EYY

    EYY Well-Known Member

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    yes the constant power to the pcm is in the small 6 pin plug inside (only pins used) and should fix that problem. As delco said above it's either a red or orange wire
     
  18. WreckWren

    WreckWren New Member

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    Awesome stuff lads, I'll give this a go tomorrow and report back. Cheers again
     
  19. WreckWren

    WreckWren New Member

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    OK little update:

    Still fiddling about with other bits of the car so haven't yet run the extra power wire to the ECU, however it's on the agenda to start with tomorrow.

    With the little 6 or 8 pin white connector near the PCM on the engine loom, what I was thinking of doing is just soldering a wire to a pin and inserting it into that plug to match whichever is the right cable, then running that to the battery +ve terminal.
    Problem now is I'm not sure exactly where that plug is in the Gregory's manual set of wiring diagrams I have so I'm still not 100% sure what I should be hooking up to 12v.

    Driving it about a bit to test it has revealed that it's idling high once warmed up. Really high, like 1500-2000rpm. Otherwise running great. Turning the car off and on will result in it stalling out and running sluggishly low down but otherwise OK.
    Is this the result of the above or should I be looking for air leaks?

    Also, this is an in-depth bonus round: I have been trying to hook up a battery disconnect switch.
    I got the right gauge of wire to go to it, got the right connectors for the ends, hooked it all up by the book (in-line before the -ve terminal), but the book I had didn't cover what to do about the earth that goes to the relay box in the engine bay that you screw in near the battery.

    What do about this earth? Should I combine it with the -ve cable to the switch then run it off the return to the battery back to the relay box? Or put a relay on that earth and hook it up to the switch?
    If left connected with the -ve terminal disconnected, bad things happen... So I've heard. :oops:
     
    Last edited: Oct 27, 2018

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