[T3] Two Tests

Jim Adney jadney at vwtype3.org
Tue Sep 17 14:37:37 PDT 2019

On 17 Sep 2019 at 10:33, William Jahn wrote:

>  I do find quite a bit of varied info when reading different D-jet sites.

Yes, and there's a lot of it that's misleading.

> Then I need to check the wires from the ECU to each component just to
> make certain TS1's 2 leads are not crossed or grounded with any one of
> the other leads. 

There's certainly no problem with checking this, but I seriously doubt if 
there's short somewhere inside your harness. I've never heard of that 
happening, although it's possible out at the ends, where the individual wires 
are exposed and where then tend to get abused.

> Yet since the one you have runs rich it may not have anything to do
> with TS1 or TS2 internal ECU it could be any of the circuits and there
> seem to be quite a few and 

That's exactly right. It could be any of those circuits and the temp sensor 
circuits could be working properly.

>  I wanted to ask. I know you removed the EGR and plugged the ports,
> did you remove the EGR relay? I ask because the Bosch tester does not
> seem to look at that circuit. 

I capped the exhaust port on the heat exchanger and the intake port on the 
EGR valve, but I left everything else in place. My relay is still there and I can 
still hear the EGR valve click when I turn the key ON, but nothing is getting 
thru it. I did it this way because I didn't want to bother with sorting out all the 
wiring and worrying about what might short out to what. It's been fine this 
way, although it leaves the engine compartment a bit more crowded than I'd 

One of the actual reasons I did it this way was that the original EGR filter 
was still there when I got the car, but it was falling apart. I thought that 
someday I could redo the failed silver-soldered joint and reinstall it, just to 
see if that was feasible. I still think it would be interesting to reinstall it and 
see if I notice any change in performance.

If you removed the relay, what did you do with the loose wires?

Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA

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