Hey guys today while working on the GTU I noticed that the sending unit did not have its wire at all. I just thought the sender was dead and thats why my guage didn't work but now I know better. Where is the origin of this wire? I'm not too good with the diagrams i've seen in the FSM so those probably won't help although i'm pulling them up right now. Does that wire go straight to the guage cluster or does it go to the ECU first?

 

It should be sticking out of the smallish harness bundle down there below- the oil level sensor wire meets the harness at about the same location...It goes straight to the gage cluster (with a tee-off to the capacitor on the slave cylinder), with 2 harness connectors along the way, yellow/red the whole way...

 

Alrighty i'm going to go check on it again and see if I can't locate it again. If anyone knows the pin that it does to on the guage cluster that would help. i'm thinking i'm just going to run a new lead wire up there.


Santiago

 

Man, unless someone removed it just to mess with your head, there will be a yellow/red wire at least at the cluster, ya think? BTW, in the engine bay, because of its location, the color will probably be black/black

 

lol I still can't find anything. I took a look at around 4 wires and they are all plugged into their plugs and none have that type of connector for the oil PSI unit. I think i'm just running another wire down.

Santiago

 

Is there anything coming from that capacitor on the slave cylinder? You could splice into that one...It SHOULD find it's way to the cluster, unless someone cut it...

 

Ok I found I have two caps one on the trailing packs and one on the rear part of the engine block. I removed the grease from the rear cap and it was yellow/red. I plugged that in and now I have an oil pressure reading. It looks good!


Santiago

Thanks guys.

 

IIRC the red/yellow (or yellow/red) wire runs parallel witht eh capacitator and the oil sensor, into the gauge pack. Hope that helps, I was missing most the wire (looks liek someone cut it at the taping) and had to splice in some wire to connect it to the oil sensor. There was no connector on my oil sending unit either, just a little nipple feelin... errm... muahaha

just a little circular post in the middle of the oil pressure sending unit. I wrapped a bare wire around that post and it seem to be working fine.

 

decent picture here


EDIT: I spliced that green wire onto the red/yellow off the harness on the driverside low engine bay

 

Get the S4 FSM wiring diagram (in this case the info should cover S5 too) and look at the diagram of the engine harness on page 50-114. It should be pretty clear how to follow the harness to find the missing wire.