OEM MK4 management wiring => Mk1/2/3 harness install FAQ (Now with added dieselness!)

Hey Jonny,
Thanks for the answer but I don’t under what u mean when u write ecu Pin 8 or 10
Where do I have to connect the wires ? I’m completely lost

 

Jon I have the earth from the engine straight to the battery and the shorter I have it attached to the

I’ll change the relay maybe and the earth from the engine harness is attached to the battery and the earth from the ecu is attached to the body and is 100% sure is clean but I don’t understand why my injectors they’re not getting earth pulses from my ecu when I disconnect the plug from the injectors it change to earth green and when I connected back to the injectors the earth signal change to a positive signal when I crank the engine I see green light with the red positive signal mix signals from the injectors if I stimulate earth it turns on but when I trying to press the gas it dies I did a throttle body alignment, I reset all codes but still same problem from old harness from a 1999 Audi A4 and now with a mk4 with wire pedal and immo off the ecu
Please guide me Jon with my options pins that maybe I missed
I’m very frustrated with this engine…

 

Lol

Lol no bro I was using a 53 sorry

 

@rubjonny
Am trying to use the oem fuel pump relay 409, but would like some tech advice, so far am ok with understanding the pins but not sure where to pick the crank sensor signal from on pin 1/mot? What polarity should it be?
Also pin 9/tk what polarity should it be?


Pin 4/15 = Ignition 12V
Pin 2/30 = permanent 12V from fuse 2 on battery
Pin 8/87 = relay output to fuses inc. fuel pump
Pin 6/31 = earth
Pin 3/C = connection to airbag control unit
Pin 1/MOT = connection to crank sensor
Pin 9/TK = connection to door contact switch

am correct in saying they -ve input into the relay?

thanks

 

my mk1 is carburettor so i will have to have an external fuel pump relay. So pur/wht goes to pin 6/31 correct? And rest as usual

 

My mk1 its 1990 cabriolet with ce1 but not ceramic.
And got the information of this site when looking for 409 pin out info
https://www.briskoda.net/forums/topic/442582-vrs-fuel-pump-wiring-diagram/

Thanks

 

Hi, anyone got a diagram and ecu pinouts for a 9n3 2005 polo gti Cup engine code is BBU.

I've looked at the Seat Ibiza BJX code in rubjohnnys sigs but it differs from the vw loom.

There's no coloured plugs on this loom all the wiring on the main harness goes back to 2 big square sockets banks for the plugs all labeled Ta Tb Tc etc so would be grateful if someone can help, eventually this will be spliced into a scirocco loom CE1

 

Much appreciated

 

I recently bought an 89 Corrado with an Auq installed using this very guide. I've just got the Ghetto motorsport tach convertor box to get my rev counter working. Any suggestions on how and where best to fit. It needs 1 earth, 2 ign live, 3 Ecu signal and 4 the tacho.
Also I'm suspecting some conflict with the TT pedal that's fitted, ecu seems to have lost it a few times intermittently, should it be compatible with the auq?

 

Perfect!! Thanks John, de-stressing my wiring related anxiety once again. :-)

 

So i have another query on my AUQ Corrado. Looking to install an OBD port and understand i just need live, earth and K line to obd ports 16, 4 and 7. The K Line seems straightforward as its a white and grey wire however no obvious brown wire amongst the 2 blocks im working from, will any earth do or is there a particular colour? For live im guessing its the one of the two red and white wires that has continuity with the battery +