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GTI > Sierra - GTI loom - what's this plug?
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Author:  ChrisN [ Thu Aug 14, 2014 7:38 pm ]
Post subject:  GTI > Sierra - GTI loom - what's this plug?
I'm making progress with getting the GTI engine into the Sierra.

I've found one plug on the GTI harness, located near the thermostat housing, that I can't identify. As shown in the pic, it's a similar plug to the other water temp sensors at the thermostat housing (for the ECU, Lg/B and Bl/W) but the plug is grey and the wiring is Bl/Y and W/Bl.

I've studied a few copies of the wiring diagram for the GTI and so far I can't find out what this one is supposed to be connected to. The GTI harness was supplied with the motor.

It's not the ISC solenoid or the canister purge - I have identified those by plug and wire colours.

Any ideas?


Image

Thanks!

Chris
Author:  Gwagensteve [ Thu Aug 14, 2014 9:16 pm ]
Post subject:  Re: GTI > Sierra - GTI loom - what's this plug?
These are huge and possibly unhelpful guesses, but temp sender for the ecu, or, if that's in place, second temp sender for the a/c, or temp sender for the fans, which are typically not ecu controlled this long ago.
Author:  ChrisN [ Thu Aug 14, 2014 10:20 pm ]
Post subject:  Re: GTI > Sierra - GTI loom - what's this plug?
Thanks Steve - all good possibles. I have the ECU sensor in place. Probably one of the others you suggest.

I understand the brown sensor (pic below) is the fan, and is a simple switch, so I'll run separate wiring for a fused 12v positive supply (ignition on) to that to trigger a relay to power the thermo fan.

The last one worrying me is the single spade terminal sensor on the right of the brown, which I think is for the dash cluster temp gauge. I'm hoping that is just a simple wire to the gauge as I haven't been able to track down the right wire in the Sierra loom.

Image

PS - anyone got a spare oxygen sensor for the GTI? Or a good source for one? :)

And buggar - I've just realized I haven't put the thermostat or the gasket into the thermostat housing outlet. :oops:
Author:  Gwagensteve [ Fri Aug 15, 2014 7:39 am ]
Post subject:  Re: GTI > Sierra - GTI loom - what's this plug?
Yep, just plug the sierra water temp wire onto the single spade plug.
Author:  UBZ [ Fri Aug 15, 2014 4:34 pm ]
Post subject:  Re: GTI > Sierra - GTI loom - what's this plug?
if that is your engine in the photo , you have a mk2 or mk3 GTI engine .
are you sure you we're looking at the right wiring diagram?

my guess would be an idle up circuit for The AC pump or Power steering pump .
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