Help .... Please

Discussion in 'Electrical' started by Louis_Cleaver, Oct 12, 2019.

  1. Louis_Cleaver New Member

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    Hi,

    I started a build job several years ago, I stripped the car and then had children, Well she’s 6 now and I feel like I can Carry on with the car.....


    Problem being I have forgotten where a lot of the bits go....

    can anyone help identify this cable, it’s located near the fuse box in a 97 AGG colour concept mk3, I started a 20v18T conversion and aim to complete it but I have fuelling issues. i can’t attach the picture for some reason,


    It’s a black 3 pin clip.

    With
    A black and green cable
    A black and white cable
    And a purple and white ?



    I suspect fuel pump/pump relay issues and have several codes but the fuel send and return line are dry....

    Any assistance would be appreciated thank you
     
  2. rubjonny

    rubjonny Administrator Admin

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    hello there, this plug is the connection to the cluster for the indicator warning lamps and mpg signal from the ecu. 1 half will be hanging out the back of the clocks, the other half will be tapped into indicator wires on A1 and A2, and mpg signal comes from the ECU. I've heard mixed info whether the MK4 signal will work right, can always give it a go :)

    https://clubgti.com/forums/index.php?threads/fusebox-faq.219775/
    https://clubgti.com/forums/index.ph...install-faq-now-with-added-dieselness.267196/
     
    Louis_Cleaver likes this.
  3. Louis_Cleaver New Member

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    Brilliant, Thank you. ill have to take a look at removing the clocks again then. Thanks again for your help. I'm sure Ill discover a few more things as I go on with this project, naively started it thinking it would take a weekend.....
     
  4. Louis_Cleaver New Member

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    I assume that would be related to the code i got > 18058 Powertain Data Bus: Missing Message From Instrument Cluster..
     
  5. rubjonny

    rubjonny Administrator Admin

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    no need to remove the clocks, you should be able to dig the cluster side of the plug from underneath. its the engine loom side you probably need to find!

    this is unrelated to the cluster code in the ecu thats because it cant talk to the mk4 ecu any more, doesnt affect engine running but you can have this coded out if it bothers you. Can also sort any SAI codes and other missing things you've deleted at the same time
     
  6. Louis_Cleaver New Member

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    [​IMG]

    That was the wire in question.
     
  7. rubjonny

    rubjonny Administrator Admin

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    ok that is the plug coming out of the clocks, so you need to find or add the mating plug to your engine/lighting loom :)
     
  8. Louis_Cleaver New Member

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    Hi,

    Can I just splice them directly as mentioned in your previous reply ?

    I also have a 2 pin yellow block in the front of the engine bay by the powersteering pump ? (looks like both wires are yellow) I dont suppose you can shed any light on them ?
     
  9. rubjonny

    rubjonny Administrator Admin

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    I wouldnt splice direct as then you wouldnt be able to split the engien and clock looms in future without cutting the wires. have a look at your A1 and A2 plugs, the mating side of the plug comes from the black/green and black/white wires here, and might still be there just tucked away where you cant see

    2 pin yellow plug with 2 yellows is the dimdip resistor, not sure exactly where it is in a mk3 but its a ceramic thingy about the same size as a pack of polos. dont need it plugged in by law or for mot, just make sure the wires are tucked up safe as if they short out your headlight loom will go up in smoke!

    you can unplgu the dimdip wires behind the fusebox if worried, look for 2 single plugs with yellow wires disconnect these and you can rest easy
     
  10. Louis_Cleaver New Member

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    Thank you again, Ill take a look at these tonight when I get home. I really appreciate your help.
     
  11. Louis_Cleaver New Member

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    I’ve blocked off the dim dip cable and hidden, I couldn’t locate those other wires to connect though so I’ll make do with out them.

    can you tell me how to identify which lambda sensor is pre and which is post cat ?

    I think I’ve gotten to the bottom of the fuelling issue to, conlog immobiliser system being intermittent, by passed the relays and starter wires to test, and seems good.
     
  12. Louis_Cleaver New Member

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    Saying that I might be able to work it out based on available cable length so I’ll look tomorrow.
     
  13. Louis_Cleaver New Member

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    Ok so took a look today...
    Just turns over doesn’t fire, it’s like the injectors are not working. Short to ground errors mentioned in scan.

    the fuel is making it from the pump as expected, the injectors all read 11.9 ohms there is low voltage at the injector rail, only reads about 4 volts.

    the car sparks and will run if easy start is sprayed into the maf.

    I have checked all fuses and relays all seems to be ok?

    Is there anything else I can check? Could I have missed a ground cable somewhere ?

    I just run a scan on the car and have several short to ground errors, and it mentions all four injectors?

    it mentions

    cam shaft sensor short to ground - P1530
    O2 sensor short to ground P1117
    N75 short to ground - P1547
    Fuel injector P1225 - P1226 - P1227 - P1228
    I bypassed the fuel relay as a test - so got P1541 fuel pump relay open.


    I also have P1649 powertrain data ABS controller
    Crash signal P1523 implausible
    P1659 instrument cluster Powertrain data missing
    N80 open circuit - expected as N80 is removed
    P1433 SAI expected also as removed.
    P1432 N112 also expected as removed.


    I appreciate it’s a lot of errors, I feel like I’ve probably made a bad earth somewhere? Or I’m missing some thing, as the majority of them have the same error?
     
    Last edited: Oct 19, 2019 at 11:19 PM

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