'82 Coupe-CSV

[Ti Kan]

OK, sounds like your maybe your car has some wiring problems.
Normally, in order for a 12V to appear across the two pins of the CSV,
the following conditions must be true:

- The ignition switch is in the "start" position (note my typo in my
  previous email, when I typed "ignition switch is on").  This supplies
  the 12V from the battery through the fuse/relay panel to the positive
  pin of the CSV.

AND one of the following:

- The TTS has determined that the engine is cold and shunts the
  negative pin of the CSV to ground.

- You have a hot start pulse relay and you have been trying to crank
  start the car for more than a few seconds and the car doesn't fire.
  The hot start pulse relay will then start clicking on and off to
  shunt around the TTS, allowing the CSV to "pulse".  You should be able
  to hear the hot start pulse relay when it does this.

If you are seeing 12V at the CSV plug even after the car has started
and is running, then the 12V supply to the CSV is not wired to
the fuse/relay panel correctly, or there is a problem (short) in the
fuse/relay panel itself or wiring to cause 12V to get into that line,
*and* either the TTS or hot start pulse relay is shorting to ground.

To test the TTS, simply disconnect the plug from the TTS when the
engine is warm/hot, and test the continuity using a multimeter between
the engine block and the TTS switch pin (the one that has the green/white
wire going to it from the plug).  If it reads near zero ohms, then the
TTS is bad.

If you have a hot start pulse relay, check the continuity between
the TTS plug green/white wire and the engine block.  It should be
open circuit.  If you have a short, then either the hot start pulse
relay is stuck on, or there is another wiring problem somewhere.

Look at your car's wiring diagram to try to understand what I'm
describing here before you start debugging.

HTH.

-Ti
2003 A4 1.8T multitronic
2001 S4 biturbo 6-sp
1984 5000S turbo
1980 4000 2.0 5-sp
-- 
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DBF writes:
> Ti, thing is, the 12v is constant.  Once the car starts, the CSV continues
> firing causing the mixture to be extremely rich.  The car wants to stall.
> Right now, if I was to start the car and let it idle for a minute or so (CSV
> unplugged), there would still be 12volts at the plug.  If I were to plug it
> in, the car would stall.  I tried unplugging the TTS and it never made a
> difference.  That is why I'm wondering if the relay is pooched, or did I do
> something while the fuse panel was toyed with?  Beats me.  BTW, I forgot to
> mention, there was a dash swap done a few years back by the PO.  It was a
> border-line butcher job.  I suspect, after thinking about it a little
> longer, the possibility of a sub-par swap of the dash may be causing the
> problem as well.  If your deduction is correct about my car not having a
> relay, how would I check the TTS?
> 
> Dan
> ----- Original Message -----
> From: "Ti Kan" <ti at amb.org>
> To: "DBF" <dbf288 at eastlink.ca>
> Cc: <quattro at audifans.com>
> Sent: Thursday, February 26, 2004 8:32 AM
> Subject: Re: '82 Coupe-CSV
> 
> 
> > DBF writes:
> > > ...
> > > start problem.  As part of my troubleshooting experiment, I had the CSV
> > > disconnected.  After I had the fuse panel out, I decided I'd check
> > > everything to ensure I never buggered anything up.  Well, I now have to
> > > report there is a constant 12v to the plug for the CSV.  Looking at the
> > > schematic in the Bentley, there is only 1 place for the 12v's to come
> > > from and that is through the Hot Start Pulse Relay.  I hunted everywhere
> > > for that bugger and cannot find it.  I have a sneaky suspicion that it
> > > is under/behind the passenger side dash.  Can anyone confirm this?
> >
> > It's correct that there is 12V to the CSV as long as the ignition
> > switch is on.  The circuit gets completed by the Thermo-Time Switch
> > which shunts it to ground when it decides to fire the CSV.  Otherwise
> > the TTS is open circuit.
> >
> > The hot start pulse relay is not found on every CIS car.  Many don't
> > have it.