Had another look over the weekend , split the joint that feeds pins 54+55 , identified the F125 feed and rejointed the cables with a new direct fused feed , went for a drive and unfirtunately got the same error , couldnt find the T17m connector yet.
One thing I noted is that the feed from 54+55 must provide power to the TCU as when the feeds to 54+55 are removed the module looses comms to VCDS so I dont thik that is whats being monitored by block 3 , I forgot to split 54 and 55 and put them back on individualy to see if just one was the main feed and one could be the transmision solenoid power relay supply?
Will carry on investigating this week.
18155 - transmission solenoid power relay
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allroadadi
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Re: 18155 - transmission solenoid power relay
Not much knowledge from me when it comes to the transmission, but my bet for the water leak is the cowl cover got moved or the plenum chamber cover is not seated properly in the cowl cover slit. By cowl cover I mean the plastic bit with holes for the wiper arms, sits right up against the windscreen (bottom of it), meanwhile the plenum chamber cover is the plastic bit that covers the coolant reservoir, ecu, brake fluid reservoir, etc.
Well the system works like a roof shingle: cowl cover slides under the windscreen glass, plenum chamber cover slides in a slit at the bottom of the cowl cover. Well, when you pull the plenum cover sometimes to check the brake fluid or what not: it dislodges the cowl which should have clips prone to falling off into the plenum chamber. I wound up putting a screw into those metal clips to prevent his ordeal. Water will go inside the car through the pollen filter area when these plastic bits are not seated properly. There was a write up on Quattroworld about how to also seal the pollen filter plastic mount to further prevent water getting in…
Well the system works like a roof shingle: cowl cover slides under the windscreen glass, plenum chamber cover slides in a slit at the bottom of the cowl cover. Well, when you pull the plenum cover sometimes to check the brake fluid or what not: it dislodges the cowl which should have clips prone to falling off into the plenum chamber. I wound up putting a screw into those metal clips to prevent his ordeal. Water will go inside the car through the pollen filter area when these plastic bits are not seated properly. There was a write up on Quattroworld about how to also seal the pollen filter plastic mount to further prevent water getting in…
Re: 18155 - transmission solenoid power relay
It's such a crap system. I saw on a different A6 platform car of the same era that it has a more secure cover on the pollen filter. Who knows why they didn't use the same on the RS6. It's a terrible design and can easily let water in from the windscreen run-off directly into the middle of the pollen filter and down into the cabin. Dumb.
/Might have been a golf, not A6. Can't remember.
/Might have been a golf, not A6. Can't remember.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: 18155 - transmission solenoid power relay
Update
As a precaution I remade off the two main cable joints that are in the TCU loom just before the TCU , on inspection the cables where blackened with corrosion , so chopped back the cable , remade the ends ,crimped the cables back together and fully heat shriked to prevent water ingress in the future.Reinstalled the TCU and went for a test drive , everything worked fine , watching the same block value for the shift solenoid voltage and its steady at 13v.
I have been for a few drives and it hasnt missed a beat.
I still want to identify the feed for measuring block 3 (terminal15 supply) as I not 100% I have found and fixed the issue so want to make sure I now where the supply is if I have any future issues. I did find a wiring diagram online which showed that the relay block under the dash as the relay that supplys voltage to terminal 15 , J329 , which is the supply for Term15 which is what I belive Measuring block 3 is referncing.I belive its the far left relay out of I think the five relays.
So when I get a cjance I am goiung to get measuring block 3 up on VCDS and remove relay j329 to see if the referenced voltage dissapears.this will at least confirm where the supply comes from for term 15 if I need to do anymore testing down the line.
Regarding the water ingress it was a combination of a few things , the scuttle panel not seated onto the bottom of the windscreen , this was letting water into the central scuttle area where the Coolant resevoir lives , then I found the central drain under the main fuses was blocked so the central scuttle area was inches deep in water ,upon sticking a pick into the drain there was a bit of resisitance then the water poured through the drain and onto the floor beneath the car, then there was an open grommet next to the ECU housing , so when the central scuttle filled up the water it just poured through the open grommet into the drivers footwell.
Drain hole
open grommet location
putting a pipe down drain hole to the blow through with airline
I had the entire scuttle out last year and cleaned the drain out at the time but within 12 months its blocked again , the RS6 usually lives under a car cover so I have no idea how its getting blocked so quickly.will have to make rgular checks now to check the scuttle drain.
Will report back when I have investigated j239.
As a precaution I remade off the two main cable joints that are in the TCU loom just before the TCU , on inspection the cables where blackened with corrosion , so chopped back the cable , remade the ends ,crimped the cables back together and fully heat shriked to prevent water ingress in the future.Reinstalled the TCU and went for a test drive , everything worked fine , watching the same block value for the shift solenoid voltage and its steady at 13v.
I have been for a few drives and it hasnt missed a beat.
I still want to identify the feed for measuring block 3 (terminal15 supply) as I not 100% I have found and fixed the issue so want to make sure I now where the supply is if I have any future issues. I did find a wiring diagram online which showed that the relay block under the dash as the relay that supplys voltage to terminal 15 , J329 , which is the supply for Term15 which is what I belive Measuring block 3 is referncing.I belive its the far left relay out of I think the five relays.
Regarding the water ingress it was a combination of a few things , the scuttle panel not seated onto the bottom of the windscreen , this was letting water into the central scuttle area where the Coolant resevoir lives , then I found the central drain under the main fuses was blocked so the central scuttle area was inches deep in water ,upon sticking a pick into the drain there was a bit of resisitance then the water poured through the drain and onto the floor beneath the car, then there was an open grommet next to the ECU housing , so when the central scuttle filled up the water it just poured through the open grommet into the drivers footwell.
I had the entire scuttle out last year and cleaned the drain out at the time but within 12 months its blocked again , the RS6 usually lives under a car cover so I have no idea how its getting blocked so quickly.will have to make rgular checks now to check the scuttle drain.
Will report back when I have investigated j239.
Re: 18155 - transmission solenoid power relay
Good info. I'll be interested to see where the TCU is measuring the voltage, too.
As for the water ingress, the Audi engineers should hang their heads in shame at the pitiful lip-service to weatherproofing.
As for the water ingress, the Audi engineers should hang their heads in shame at the pitiful lip-service to weatherproofing.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."