ECU reading codes...

[A80Avant]

Hey,
i have a question.I asked someone in charge for the vag-com program and cables about my problem(i cannot read the engine fault codes,but i can read everything else),and he said that if my car has 3 plugs(the third used for blinking out the codes),then this is how it was made in the early years.I can read the engine with a led and blinking,and i can read everything else with my VWtool or vag-com software.

is that true?do you have 3 plugs or 2 on your cars?
i didnt thinktha what he said sounded really professional,but i think i will try blinking out the codes just to see if there something coming out from the ecu...

cheers
vasilis

[newsh]

Here's the link to the Blinks.. Really easy to do once you've sussed it.

Linky To Blinky

[A80Avant]

thanks,
but by the way,could what he said be true?does it have any logic to it?
cheers Vasilis

[BRY]

You can read the fault codes with both Vagcom and the led.
We have three plugs on our S2s, last itme I looked!

[A80Avant]

i know i know!thats what i thought!!
but is it possible that if vag-com cannot read the engine fault codes,that a led could??
it sounds strange!!!

[WabTheKing]

my mate tryed plugging vagcom in the other da on his 3b s2, nout! tryed the led thing nout! whats causing this?, did a contiunity test on the wires back to the ecu all ok?

(he did the test not me, just rang me up to see if i had an idea what could be wrong)

[A80Avant]

how do you do a continuity test from the plugs to the ECU??

[WabTheKing]

how do you do a continuity test from the plugs to the ECU??

like i said he tested it not me

[Nuvo]

You can use a DVM set to measure the resistance between the respective pins at each plug end.

Nuvo

[Welleh]

done it with a fluke multimeter, just use buzzer test and bob's your uncle! its quite weird really, the wires arnt shorted, theres +12.3v across the black plug and theres +12.3v on the single pin from the blue plug to gnd! think that sounds about right, but the led just stays on when i try and trigger it with the jumper, no flashes or anything, and vagcom cant even find it!

[Welleh]

anyone got any idea what so ever?

[mcandmar]

Check the Fuse, i blew one of mine before which took me a while to figure out, on a 7A there is a large red holder in the fuse box with two fuses in it, one is for the ECU and the other is for the diag connections. I would guess an S2 is the same...

Mark.

[Welleh]

the fuse is fine!, checked that and replaced them all before anything else! any other ideas?