[V8] 93 Audi V8 / AT ZF4HP24A

Mon Jul 13 13:16:53 PDT 2009

the Key indicator here to the failure of the Speedo transmitter is when you drive the car until warm/hot ... the speedometer fails . ( drops and goes to 0 ) . after the failure of the Speedo Transmitter ( ST ) it may shut the engine off as it gets hotter ( heat soaked ) 

I have a spare brand new AT ZF4HP24A sitting in my garage, so I took out the ST ... for some reason this has two electrical prongs ( 012 409 191 A )  and not three (012 409 191 G)  like the one that I pulled out of the car. The car is now running without a speedo transmitter and it's running fine with no shut downs . If I use part 012 409 191 A )  my car will run, but the speedo shows double ... if you are driving at 60 it'll register 120 !! 

9 things about the Speedo transmitter

1) you need to have small hands like a child to take the part out . 

2) the part is on the Drivers side of Transmition , front near the LH axel flange 

3) cost is $57.00 CAD for the Part . 

4) install wrong ST =  2x the speed on the speedo . The cut off for my cars speedo is 225 KPH ask me how I know this :-) 

5) part numbers 012 409 191 G  or 012 409 191 A 

6) the Transmitter is snapped into place , no real hardware used to attach !! 

7) The ST has plastic finger that holds it into place . 

8) the electrical connection has be taking off first before you try to remove it ST .

9) time to do the job about 1/2 hour . 

cheers 

superdave 

> Date: Sat, 11 Jul 2009 17:40:39 -0400
> From: ingo.rautenberg at gmail.com
> To: dsaad at icehouse.net
> CC: v8 at audifans.com
> Subject: Re: [V8] 93 Audi V8 / AT ZF4HP24A
> 
> You have to be pretty careful when making said diagnosis. I had almost
> identical symptoms, except worse (with the culprit being the ignition
> reference sensor). When these sensors go, it triggers the ecu to cut the
> power to the fuel pump relays -- yes, the '93 (and I'm pretty sure the '92)
> have two fuel pump relays. So I guess that's the third culprit behind the
> engine timing and reference sensors. Hey, whatever fixes the problem, I
> say!
> 
> Regards,
> 
> Ingo
> 
> On Sat, Jul 11, 2009 at 5:26 PM, Dave Saad <dsaad at icehouse.net> wrote:
> 
> > First, one possibly significant detail: the speedo sensor is an
> > electronic "Hall" device. It senses the presence of a magnetic field
> > of a magnet that rotates past it.
> > This is different from the RPM and Crank Position sensors which are
> > simply coils of many turns of fine wire. They induce a voltage when a
> > piece of iron passes by.
> > So the Hall switch is an electronic switch with a 5-volt square wave
> > output, and the others are analog voltage output that must be
> > conditioned and converted to a digital signal.
> > The hall switch has 3 wires - 5v supply (from the ECU), output
> > signal, and ground. If the sensor is known to be good, then the only
> > other logical choice I see is that the 5-volt supply is crapping out.
> > That seems to jibe with the other symptoms too. That also means the
> > ECU is the most likely culprit.
> >
> > Dave
> >
> >
> > On Jul 10, 2009, at 10:55 AM, D Morralee wrote:
> >
> > >
> > >
> > > 93 V8 4.2 AT
> > >
> > > I've been having this intermittent problem for a couple of years .
> > > It's one of those problems I've never seen any reference to .
> > >
> > > Here is the problem .
> > >
> > > Car runs great for the first 20 mins and then the speedometer
> > > sputters back and forth to what ever speed you are doing 0 - 60 mph
> > > ( car is now at operating temperature ). A couple minuets after
> > > that the speedometer drops to O and just stays there . The Speedo
> > > then stars to sputter up and down again but there is a difference
> > > …. the engine then turns on and off like you were turning the ign
> > > on and off ? This all happens very quickly not enough for you to
> > > pull the car onto the side of the road . If you're in Stop and Go
> > > traffic then sometimes you will have to restarted the engine . This
> > > funky stuff only happens for a couple of mins and then the car runs
> > > great. What is it ? I hope you're not reading this and thinking you
> > > have the answer …. It's the Speedo transmitter ( G68 ) that is
> > > causing the problem . The Speedo transmitter is on the ZF4HP24A
> > > Auto Trans by the mulit switch . This sensor picks up the rotation
> > > of the LH driveshaft and sends the signal to TCU & or the
> > > speedometer . These sensors are build/designed like the ref / rpm /
> > > abs sensors running on other parts of the engine and chassis . As
> > > we are all aware that these sensors get heat cycled and eventually
> > > die a slow death. Not sure how this all ties into the end result of
> > > the car cutting out, but I do know that it is related to Heat .
> > >
> > > Other than that the new tires and rim combination has worked out
> > > great . Tonight I'm picking up my and installing my new K&N filter.
> > > Next week I'm getting some exhaust modification done . One of the
> > > mufflers is coming off and new stainless steel pipes will be added .
> > >
> > > Well that’s my news . Superdave .
> > >
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