Mattman928

I have a couple of wiring diagram questions for those who are wisened in the ways of Porsche drafting.

1) On sector K83 of Sheet 10, there is a number of wires that go to a Box with "6" in the middle. What do these boxes mean? I have seen them elsewhere (e.g. there is a 1, 2, and 4 in boxes for the injector system)

2) On sector E90 of sheet 10, there is a common line labeled "30". There is also on F88 a line labeled "15". What do these lines mean...A common, a bolt, a wire splice, etc???

Thanks

- Matt

Ed Scherer

1) I believe those are known as "welding points" (according to the little legend you'll see elsewhere on some of the diagrams); the wires are probably crimped together or somehow connected.

2) These are DIN 72552 / Bosch terminal/bus designations. "30" = "Line from battery positive terminal (direct)" and "15" = "Switch-controlled plus downstream from battery (from ignition switch)". The whole set of terminal designations are good to know, as you'll see them all over: on relay terminals, pod switches, etc.

Mattman928

I am trying to chase the circuits from the CPS back to the EZK. I noticed that there is a connector at the end of the CPS pigtail, which is shown on the wiring diagram. Then there is another connector on the diagram "T45" (On Section K83 of the wiring diagram). The drawings state that this is at location 6dL, which appears to be on the passenger side of the car around the fuse panel.

DOes anyone know what this is?????

Ed Scherer

The notes for connector T45 say "under the central electric". It's a two-pin connector. And that it's for the ignition final stage.

I'm not sure what you're asking, though "What this is". It's a two-pin connector, with one green wire and one white wire on each side.

Mattman928

Thanks. Does under central electric mean that it's behind the fuse panel?? It seems that there is a connector under the MAF at the end of the pigtail. then it seems from the descriptions that there is another connector behind the fuse panel??

Ed Scherer

I think I just happen to have a photo of it, too (look above and a little to the left of the relay with the "Test" label on it):

jcorenman

As much as I love pictures of a clean CE panel, we might be off track a bit here...

Matt, if you are looking for the CPS connection to the EZK, it is wired direct. The CPS ("speed sensor" on the wiring diagram) has a short pigtail and a (unlabeled) disconnect that lives in a bracket under the MAF, and then runs direct to the EZK through the engine harness-- no other disconnects.

The T45 disconnects are for the ignition-coil drivers, pins 15 & 32 on the EZK. Those do wander a bit...

P.S. Ed, that CE panel is really clean, have you been down there scrubbing???!!

Mattman928

You are awesome!!! Is it the black connector? Hhave you tried connecting an oscilliscope there to check for the integrity of the CPS?

jcorenman

Yes, it is a black connector (but that doesn't narrow it down much), 3-pin Amp "junior timer" connector-- the same style used on a lot of the sensors and the fuel injectors. You need to pull the MAF to even see it, and for reasonable access you need to pull out some of the fuel lines at the back of the engine (with the usual precautions).

And no, I haven't had occasion to put a 'scope on a good one. I think you can do that from the EZK connector (there is a description in the WSM, section 24/28).

What are the symptoms?

Mattman928

Jim thanks! I misread the diagram. I will tap into the EZP connectors to try and test the sine wave from the CPS. For the probe, do I connect the signal probe to pin 23, and the ground to pin 6 on the connector??

jcorenman

Yes, signal on pin 23 and ground to pin 6. It's on page D28-11 of the WSM, copy below (almost readable...). You are looking for a 3-volt signal, peak-to-peak (bigger at the missing teeth).