GolfGTIforum.co.uk

Model specific boards => Golf mk3 => Topic started by: Diluxe on 12 March 2013, 09:57

Title: OBD port not functioning fully
Post by: Diluxe on 12 March 2013, 09:57
Can anyone advise by looking at the pic below if i have all the plugs in place for correct OBD operation?

what i have tested
Port 4 Earth?yes
Port 7 Live?yes about 9.3 volts
Port 16 Live?yes about 12.5 volts

i can read the ABS controller , but not the engine......

(http://i33.photobucket.com/albums/d96/diluxe/F54EB471-6F69-4D0D-9E50-7A297885FF96-6685-000004DAB9517ADD_zps8ff9dc58.jpg)

cheers
Title: Re: OBB port not functioning fully
Post by: Martinvr6 on 12 March 2013, 14:42
There's a separate single wire for the obd port to read the engine, its obviously not plugged in

From memory it's a grey wire with a brown male plug on the engine loom side and the same colour wire with a female plug on the car side
Title: Re: OBB port not functioning fully
Post by: Diluxe on 12 March 2013, 14:46
i thought it was the brown plug with the grey wire coming out of it next to the grey plug with grey/white wire in the picture? you dont think its that .............
Title: Re: OBB port not functioning fully
Post by: Martinvr6 on 12 March 2013, 21:10
When I did my vr6 swap into the Anni I couldn't get the Engine ECU to talk to the VAG 5052 computer, however, ABS, Airbag scanned fine, I traced it back to that single wire I mentioned not being plugged in, found the wire on the engine loom and car loom side, plugged it in, it worked fine and I was then able to erase the learnt values on my ECU and get the car started

It was a brown plug with a white/grey wire from memory

It does not plug into the fuse box it's one of those single wires that plug into another single wire

I hope this makes sense
Title: Re: OBB port not functioning fully
Post by: mark-mk3gti on 12 March 2013, 22:22
i had this problem and it was the immobiliser box not permitting me to read the engine ecu, i swapped the immobilser and it worked straight away..

rubjohny helped me with it, and he told me that the immob was preventing it, so i bought a second hand one (with the key chips) and swapped it over, then paired them with vagcom and then it worked fine..

Title: Re: OBB port not functioning fully
Post by: Diluxe on 12 March 2013, 22:23
I found a brown female plug coming in from the engine bay and it was plugged into a brown male connector which looked like it went back to the brown plug in the pic .
Title: Re: OBB port not functioning fully
Post by: Diluxe on 13 March 2013, 06:58
Reading abit more on the net I think my problem is the high voltage across pins 4 &7 . I haven't got a clue on how to establish what maybe causing this.

I had an aftermarket stereo and there was a black cable stuffed in with what I think is the ign live, as in the pic below.

(http://i33.photobucket.com/albums/d96/diluxe/317A5FEB-1DC3-4329-B8DC-1DBD6F9939AA-7910-000005D08C3348F0_zps9e8d45fa.jpg)