1995 A6,Warning lights on, Rev counter stops working (intermittent)
04-01-2005 | 03:10 PM
#1
Guest
Posts: n/a
1995 A6,Warning lights on, Rev counter stops working (intermittent)
Hi
I have an Audi A6 Avant (1995 N reg). There is an intermittent fault where
the oil light comes on and the rev counter stops working. Sometimes all the
warning lights come on with the rev counter still not functioning. After a
period of time, which can vary, the warning lights will clear and the rev
counter will start working again...
Already changed the oil pressure switch and tried new clocks, but fault
remains...
Anybody any ideas what this might be?
Thanks
Rgds
Fraser
I have an Audi A6 Avant (1995 N reg). There is an intermittent fault where
the oil light comes on and the rev counter stops working. Sometimes all the
warning lights come on with the rev counter still not functioning. After a
period of time, which can vary, the warning lights will clear and the rev
counter will start working again...
Already changed the oil pressure switch and tried new clocks, but fault
remains...
Anybody any ideas what this might be?
Thanks
Rgds
Fraser
04-01-2005 | 04:00 PM
#2
Guest
Posts: n/a
Re: 1995 A6,Warning lights on, Rev counter stops working (intermittent)
James Ewen wrote:
>
> Hi
>
> I have an Audi A6 Avant (1995 N reg). There is an intermittent fault where
> the oil light comes on and the rev counter stops working. Sometimes all the
> warning lights come on with the rev counter still not functioning. After a
> period of time, which can vary, the warning lights will clear and the rev
> counter will start working again...
>
> Already changed the oil pressure switch and tried new clocks, but fault
> remains...
>
> Anybody any ideas what this might be?
I know in the late 80's and into the early 90's VAG used a dynamic oil
pressure warning system with two oil pressure senders. There was one
sender for idle which switched at a fairly low pressure, and one for
higher engine speed, which switched at a much higher pressure. A small
electronic circuit switched between these based on engine RPM. I friend
owned two older VW's with this system, and he had intermittent failures
in both. There was something wrong with the tachometer electronics that
caused the oil pressure warning system to malfunction (light came on
even though oil pressure was normal). I do not know if this applies to
your '95.
04-01-2005 | 04:00 PM
#3
Guest
Posts: n/a
Re: 1995 A6,Warning lights on, Rev counter stops working (intermittent)
James Ewen wrote:
>
> Hi
>
> I have an Audi A6 Avant (1995 N reg). There is an intermittent fault where
> the oil light comes on and the rev counter stops working. Sometimes all the
> warning lights come on with the rev counter still not functioning. After a
> period of time, which can vary, the warning lights will clear and the rev
> counter will start working again...
>
> Already changed the oil pressure switch and tried new clocks, but fault
> remains...
>
> Anybody any ideas what this might be?
I know in the late 80's and into the early 90's VAG used a dynamic oil
pressure warning system with two oil pressure senders. There was one
sender for idle which switched at a fairly low pressure, and one for
higher engine speed, which switched at a much higher pressure. A small
electronic circuit switched between these based on engine RPM. I friend
owned two older VW's with this system, and he had intermittent failures
in both. There was something wrong with the tachometer electronics that
caused the oil pressure warning system to malfunction (light came on
even though oil pressure was normal). I do not know if this applies to
your '95.
04-01-2005 | 04:00 PM
#4
Guest
Posts: n/a
Re: 1995 A6,Warning lights on, Rev counter stops working (intermittent)
James Ewen wrote:
>
> Hi
>
> I have an Audi A6 Avant (1995 N reg). There is an intermittent fault where
> the oil light comes on and the rev counter stops working. Sometimes all the
> warning lights come on with the rev counter still not functioning. After a
> period of time, which can vary, the warning lights will clear and the rev
> counter will start working again...
>
> Already changed the oil pressure switch and tried new clocks, but fault
> remains...
>
> Anybody any ideas what this might be?
I know in the late 80's and into the early 90's VAG used a dynamic oil
pressure warning system with two oil pressure senders. There was one
sender for idle which switched at a fairly low pressure, and one for
higher engine speed, which switched at a much higher pressure. A small
electronic circuit switched between these based on engine RPM. I friend
owned two older VW's with this system, and he had intermittent failures
in both. There was something wrong with the tachometer electronics that
caused the oil pressure warning system to malfunction (light came on
even though oil pressure was normal). I do not know if this applies to
your '95.
09-26-2008 | 12:04 PM
#5
Audi Forum - Posts like an A1
Joined: Sep 2008
Posts: 8
From: nuneaton uk
Re: 1995 A6,Warning lights on, Rev counter stops working (intermi
hi i have a 1998 2.4 se a6 with exactly!! the same fault did you ever find out what is is plus thanks for your info saves me changiung clocks /sensors also as an electronics engineer but with no automotive experience ? is it perhaps the voltage stabiliser eg power supply to these items mine also says abs faulty did you rplace rev counter or whole console? ? printed wiring on back of console relies on pressure contact sometimes eg screwss ? interrmitent dry joint plus freezer spray often highlights intermitent faults regards david ps have not looked at mine yet will update when i get time to get a scope on it
11-05-2008 | 06:45 PM
#6
Audi Forum - Posts like an A1
Joined: Oct 2008
Posts: 26
From: Toronto
Re: 1995 A6,Warning lights on, Rev counter stops working (intermi
keep your eye on the rev-counter the next rides. If the instrument cluster is KAPUT you are going to notice the following symptoms: Speedometer and rev counter stop working after a few miles riding, odo and clock starting to flash. After turning the ignition off the odo and clock keep flashing. If this is the case, disconnect the instrument connector located on the back of the cluster. If not, the instruments will drain your battery! The faulty instruments causing a big drain current. The instruments need to be replaced
11-05-2008 | 09:28 PM
#7
Audi Forum - Posts like an A1
Joined: Sep 2008
Posts: 8
From: nuneaton uk
Re: 1995 A6,Warning lights on, Rev counter stops working (intermi
have jut fied mine fault i the ab pump modulator<electonic control on ide of pump> quick check i ait for fault to occur a it ill hen pump arm up thenpray ith freeer can(radoi pare do one) then the fault ill go aay damn kbd playing up email for detail or tel uk 0750033960
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