Identifying spare engine plugs

Discussion in 'Electrical' started by DannyDS, Oct 9, 2021.

  1. DannyDS New Member

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    Hi all,

    Im currently tyding my bay up and trying to identify the number of spare plugs that aren't connected to anything, I have tried to find diagrams relating to the wire colours but struggling to match these up, can anyone shed some light?

    Its a VR6 OBD1

    Much appreciated
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    Last edited by a moderator: Oct 11, 2021
  2. rubjonny

    rubjonny Administrator Staff Member Admin

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    1. 10 pin: fan control module
    2. 4 pin square: aircon pressure switch
    3. 2 pin yellow wires: dimdip resistor
    4. 2 pin red/blue and green/yellow: carbon canister
    5. 2 pin white/red and brown/white: MFA outside temp sensor
    6. 2 pin blue/yellow and brown/red: aircon compressor
    7. 4 pin long D shaped: lambda probe
    8. 3 pin: knock sensor or crank sensor, need to see wire colours
     
  3. DannyDS New Member

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    Amazing, thank you very much,

    Should be able to get rid of 1-6

    What kind of effect would no lambda and knock or crank sensor do to running? Have done a few thousand miles with them unplugged.

    Cheers again
     
  4. rubjonny

    rubjonny Administrator Staff Member Admin

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    the vr6 will run ok without lambda and knock sensor, but will run a bit better once plugged in. wont run at all without a crank sensor, so thats narrowed it down :lol:
     
  5. DannyDS New Member

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    Thanks for your help, I've just found one more in the back of the fuse box, I can't remember if it was plugged in to anything before I removed the loom, I've looked online but can't find anything, the brown/blue seems to go directly to the MAF, and the red/blue down through the loom for the front headlights.

    Is there a way I can buy you a beer or something, you've helped me out a few times now

    Cheers IMG_20211021_180159.jpg
     
  6. rubjonny

    rubjonny Administrator Staff Member Admin

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    thats for headlight range control motors, you can ignore it :)
     
  7. DannyDS New Member

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    So I've put it all back together and of course it won't start it turns over but no fuel pump, haven't checked for spark yet.

    I'm getting 12v on pins 23 and 54 so the ECU is getting power and I can see it over OBD2 but it's only a basic scanner and returns no fault codes.
    When I turn the ignition on the two LCD screens on the clock go off and all I get is the handbrake light flickering on and off,no fuel level etc.

    Does it sound like a bad ground or something like that? I have checked and cleaned them all up but no change,

    Also looking at other people's wiring they all have 30 and 30b jumped, I have never had a jumper there I have a connector block that converts each pin to 2 pins and have a white/blue and a black/yellow coming off of this.


    Thanks
     
    Last edited: Oct 27, 2021
  8. rubjonny

    rubjonny Administrator Staff Member Admin

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    the big red block thing? if so thats fine but the 2 wires plugged into it shouldnt be there so unplug.

    top suspect for your symptoms would be crank sensor, did you mess with anything on that side?
     
  9. DannyDS New Member

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    Wouldn't I still get fuel pump kicking in though?

    I have re wrapped the crank sensor I'll check the wires for continuity tonight
     
  10. DannyDS New Member

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    Okay I'm now getting fuel pin 6 is it, had a break in it.

    Wires for the crank sensor seem good.

    I've just bought an OBD Eleven that should give me more info to go off hopefully
     
  11. rubjonny

    rubjonny Administrator Staff Member Admin

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    sorry thought it was a later one, the post-96 vr6 ecu wont trigger the fuel pump unless ecu sees crank signal, it wont prime on ignition either. think the early ones should prime the pump but not really worked them all that much

    but anyway thats sorted now. basic pins to check:
    1 - earth
    6 - fuel relay trigger - can poke an eared wire into this with ignition on to check fuel trigger wire
    23 - ecu relay power - wont (shouldnt!) see voltage here if ecu is unplugged, as ecu triggers its own relay
    38 - ignition live
    54 - permanent live
    55 - earth
     
  12. DannyDS New Member

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    So it runs, bad cable to the coil pack, I've also got an unknown code it has thrown, U31023 do you know what it could be for?
     
  13. rubjonny

    rubjonny Administrator Staff Member Admin

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    cant find anything on that one, get a proper usb vagcom cable off ebay will set you back less than 10 quid, then download vcds-lite from the ross tech website that'll do everything you need.
     

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