Tue May 30 12:02:15 EDT 2006
post 52/87 of the Fuel Pump Relay and fuse 24 is
already getting voltage from the same post in the fuel
pump relay via a hard connection in the fuse box. Pin
27 of the ECU appears to be the on/off switch to
determine whether or not the relay is open or closed.
Is this just a means of managing current by adding
more wires into the path when the demand from the O2
heater, ISV, wastegate freq. valve, and carbon
canister frequency valve is high?
This looks like a pretty basic relay.
Is there a standard relay with 2 output legs?
Presently, I suspect I am making a mountain out of a
molehill on this, but now I am just curious as to what
this is for.
--- Martin Pajak <martin at quattro.ca> wrote:
> Never seen J49 in wiring diagram on the S2... what
> ECU pins are actually
> connected to J49? Can you see what it does
> Following might help.. no J49...
> Let me know
> Martin Pajak
> 1982 Audi Ur-quattro (50,000 mi) new project
> 1983 Audi Ur-quattro (85,000 mi) Concourse
> 1985 Audi Ur-quattro (212,000 km) Euro spec. import
> mit 3B :)
> 1987 Audi 4000s quattro (205,000 km) wintervagen mit
> 7A :)
> > alexander stickler
> > I am just about to fire up my UrQ after the 3B
> > (finally - I said that 2 months ago).
> > Questions:
> > 1991 200 TQ wiring diagram lists an ECU power
> > relay, 'J49.' It seems to be fairly rare and the
> > dealer wasn't quite sure what part it actually was
> > what he pulled up was $700.00! With the wiring
> > diagram, there is a note that says it was not
> > installed on all vehicles.
> > 1. Does this mean that I can drive around merrily
> > without it?
> > 2. If it wasn't installed on all vehicles, what is
> > purpose?
> > 3. Is the harness the same with and without?
> > I drove the car to the shop that pulled the
> > trans, and harness for me, so I don't know if it
> > there or not.
> > 4. Part number - anyone have one for this?
> > 5. Is J49 a unique ID? - I googled 'J49 Audi
> > and got a hit for Audi A8L's Fuel Pump Relay 2.
> > this be the same part?
> > Any comments would be greatly appreciated.
> > Alex Stickler
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