Anyone able to provide me with a circuit diagram for the 52 pin ABS control unit connector on a 90 C4?
Any help is appreciated.

 

In amongst thesee I imagine

Apologies I havent ploughed through it to check

http://www.cannell.co.uk/_manuals/po..._electrics.pdf

 

Mint! Thank you, will hunt through it.

 

what info do you need....I have the factory manual ....vinnie

 

I was after the pin out for the ABS connector, mainly to check my wheel sensors at the control unit.
Have pdas / abs woes which are being elusive to solve.

 

bad coils cause lights on in the dash....tsb from Porsche on that subject...hope the control unit isn't bad, very expensive....
pin 51 lf
pin 47 rf
pin 45 lr
pin 43 rr

 

Ok looks like I've found something, with the wiring diagram and abs plug pin out I did an ohm test for the sensors at the abs plug with LF 1021 ohm, RF 1003 ohm, LR 1008ohm and RR 0.04 ohm
Unplugged the sensor and it reads 1013 ohm when testing it on its own, did further tests on the wiring and with the abs plug disconnected in the front I still get 0.04 ohm across the terminals with no abs sensor connected.
This points to the 2 wires touching each other in the loom somewhere, any hints where the most likely place is to start?

 

There are two connectors on each rear wheel. One on the trailing arm and one on the body (follow the wire back) . Try disconnecting that plug also and retesting. Failing that, inspect anywhere the cable passes through a bulkhead.