[ot] passat vr6 no start - abs control unit?

[gatesj at mailblocks.com (John Gates)]

As far as I know the two units operate independently, i.e. if one has 
failed it won't keep the other from booting/operating...  However, they 
share the K-line (communications) and maybe something is shorting?  If 
you have managed to get the car to start twice by wiggling the same 
connection I would highly suspect something in that area.  I'd trace 
the wires and test them for continuity as someone wiggles them....

Usually when a VR6 doesn't start like that it's the crank or cam 
position sensor as you obviously already know....  Do you have 
something like VAG-COM to read codes out of it?  I am not sure about 
the OBD-I cars but I know OBD-II will only pop a cam/crank position 
sensor code  if it doesn't see anything from the sensor after cranking 
for 5 seconds or more...

Seems like everything else VW, the wiring gets flaky in old age, though 
it really seems better than the earlier cars in my experience.

John Gates
--
'97 Jetta GLX
'85 Scirocco

-----Original Message-----
From: Foxx (in a box) <foxxinabox@wideopenwest.com>
To: scirocco list <scirocco-l@scirocco.org>
Sent: Sat, 15 Oct 2005 21:10:48 -0400
Subject: [ot] passat vr6 no start - abs control unit?

i'm in need of some help here as tomorrow is sunday and i need to get 
this car figures out. in question is a '94 passat vr6 5 speed. 
occasionally it does not want to start. i've replaced the ecu relay, 
crank position sensor, and the ignition module. temperature and weather 
does seem to matter. in an effort to locate the ecu (i didn't have 
tools at the time), i found the abs control unit underneath the rear 
seat. i wiggled the connector, turned the key, and the car started. 
later on the car refused to start again (after running fine not but a 
couple minutes earlier). i wiggled the connector to the abs control 
unit once more and the car started. i'm wondering, does the abs control 
unit send information to the ecu to indicate whether to start or not or 
is this simple coincidence? any help would be greatly, greatly 
appreciated. thanx.

 -- /\_/\ Foxx (in a box)
 < o o > http://foxx.tripod.com
 \ /
 ?

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