V70R-00 transmission

Transmission to Rear-end

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Duren
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V70R-00 transmission

Post by Duren » Tue Nov 06, 2018 3:24 pm

Hi I have a Volvo v70R Awd with a auto trans.

I belive that the stock ecu is bust, and becuse take another ecu from a donar car is complicated when the car is the "old body" and the engine is the newer RN engine so delite the information from the donar car cant be done exempt if you have the rarest of tool, so there I am right now,

To make myself unstuck in this scenario I start looking at a aftermarket ecu, like the EMU Black, but when I talk to someone in this buisness lokaly they just dont want to do this. They just say buy a new stock, but pay in the value of 1500dollar on "maby" solve my problem... I am not that rich, and it would be more fun to have an aftermarket ecu that i can programme myself,

But what people see as the problem is the auto trans,

My question is: what does a aisin aw55-50sn needs in term of information from the ecu??

I have another plan that run the stock ecu and beside that take information from that to feed a aftermarket ecu that control the engine,

What is your wiew on my project?? Is there any hope?? I know that this type of ecu not as good at cold start and fuel consumption, but this is not my daily, it is a vericle to have fun with.

Keith Morganstein
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Re: V70R-00 transmission

Post by Keith Morganstein » Tue Nov 06, 2018 7:25 pm

What year is the V70? What are all the trouble symptoms. I’m not a Volvo expert, but have owned and repaired a few.

On Volvo’s, many components are all connected by a CAN bus and communicate with each other. One item goes down and they all can give symptoms.

If it’s 2000 model year, the number one cause of problems that people think is the ECU... is the Anti-lock brake module. They have almost a 100% failure rate. It goes offline and cause all kinds of issues. They can be easily repaired, about $120 in the USA. Or you can cut it apart and repair it.

If it really needs an ECU, it has an ECU fault code, or it got water in the ECU, Someone with Volvo Vadis interface and software can program the ECU.

That transmission is a “controlled slip design” the ECU monitors the speed of the shafts and varies clutch engagement. I doubt it’s an easy task to control with something else.
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Re: V70R-00 transmission

Post by peejay » Tue Nov 06, 2018 8:22 pm

V70R with the AW55 is '04-05 model year, in the US anyway, not sure about anywhere else.


(my "keep it stock" car is an '06 S60R, because I wanted the TF80 transmission, and the wagon will not fit in my garage and is about 2-3x more expensive on the used car market)

I thought the Rs were even newer than the RN. My S40 was an RN engine, and the R's engine is newer than that...

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Re: V70R-00 transmission

Post by Duren » Wed Nov 07, 2018 12:53 pm

It is in the year of 2000. REALLY early one. (And the car has Volvo Gothenburg that is the car first owner), I am living in Sweden so exuse me if it is written in a strange way, but I will try to wright as if English is my mother tougue.

It is a car for the Swedish market so it may be different to the us spec,

The full history is VERY long, but generally like this, more detailed history can be written if I find the time. But i bought the car when it was running really bad, it was almost not drivable. After maf, o2 sensor, E-throttle, temp sensor and a lot more things swapped for new parts, I took the car to Volvo mecanic and they tuned it back to stock (12 years since the tuning was done. So that the tuning has gone bad, it is impossible actully) but now after the stock programming was done ther runs fine, drinks a lot of petrol and has truble code P0134.

If i disconnect the MAF the car runs just like before I tuned it back to stock. The MAF gives me a redaing of 18kg/H of air at idle, the engine has a theoreticly need of 14kg/H att idle and i have fitted 2 new Bosch original maf and No changes. So there is why I belive that it is the ECU that is to blame for my problem.

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Re: V70R-00 transmission

Post by peejay » Wed Nov 07, 2018 8:46 pm

Forgive me, I am not used to thinking in kg/h, I usually think in grams/second, so I have to convert... (18kg/hr is about 6.5 g/s)

That does sound very high. The fact that unplugging the MAF makes the car run well makes me think it is a measurement issue. On a turbocar, if there is a leak between the turbo and throttle body, this may be enough to cause a high MAF reading.

From experience recalibrating MAF tables, if you have the MAF sensor housing's clock position wrong, that will also change how much airflow it reads.

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Re: V70R-00 transmission

Post by Duren » Thu Nov 08, 2018 1:09 am

The car starts run terrible if i unplug maf, it runs fine with the maf connected. And the intake system is controlled with smoke for leaks. It is fine

I have it on the factory location in the car. With stock air cleaner.

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Re: V70R-00 transmission

Post by Duren » Thu Nov 08, 2018 12:31 pm

But the auto trans needs a reading from the tps.

Can a aftermarket ecu read that type of signal if i cut the cable that delivers that info and just solder in an extra signal cable to an extra ecu?? I wondering if it is smarter to just control the fuel with the extra ecu or control the whole engine with it, the fuel side is easy to control and hide from the MOT (in Sweden it is mandatory to do a MOT annually and they dont like extreme Custom, boring people)

make a type of crank trigger disk on the pulley and let the stock ecu read from the flywheel. And just make my own sensor mounting and let the stock have its own and the aftermarket has its own set of sensors. Exempt the tps, it would be AWESOME to be able to Keep the Cruise Control.

Is this a bad custom I am planning to do here or a good custom?? It is not a daily, it is a vericle to have fun with so a bit more fuel consumption and cold start problem is fine.

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Re: V70R-00 transmission

Post by Brian P » Thu Nov 08, 2018 5:07 pm

You are going down a very treacherous path by even considering aftermarket controllers for that. Transmission calibration for modern transmissions is insanely complex. The original manufacturer has thousands of hours into that calibration. The engine and transmission controllers have to talk to each other in order to produce proper shifts. It is really, really complicated, and you are not going to do better on your own.

In my opinion, you haven't properly diagnosed the original problem. Perhaps you haven't found the right Volvo specialist who knows those vehicles. I can tell you one thing for sure; it isn't me.

It is unlikely in this day and age for the ECU itself to be at fault for the symptoms described. Usually an ECU either works, or it doesn't work at all. An input may go bad but it will consistently go wrong (and will usually give a fault code). The programmed logic inside the ECU doesn't just magically change.

It is very likely, on the other hand, that there are faults in the sensors and wiring harness on a vehicle of this age. Electrical connectors with corrosion or high resistance or wiggled loose or bad grounds or bad power supply or who knows what. Sensors may have gone out of calibration, etc. It may not even be a wiring problem. Vacuum leaks, intake ductwork leaks (leading to improper correllation between MAF and what is actually happening), exhaust leaks, crankcase venting issues, etc can all happen on old cars and throw the calibration off.

You need to get an onboard diagnostic tool capable of displaying live sensor data and have someone who knows what to look for, look at what the sensors are displaying under the circumstances when the car is acting up.

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Re: V70R-00 transmission

Post by Duren » Sat Nov 10, 2018 7:52 am

This thread is in wrong catergory in this forum, what I originally planning on asking was about controlling tcu with aftermarket, but Keith awnsered no and I belive him. And just for that i think i leave that system as alone as possible

And then it all came to be all about the ECU (engine), I wonder how the tps is best solved, is it by conneting into a well selected cable between Ethrottle body and ecu or between ecu and tcu (IF we can vall transmission control unit tcu) in order to make the Cruise Control work. Another way I can take the information is by just drilling a hole in the gas pedal and simply take a 850 thottle body with a tps and fit it someplace neat under the dashbord and just run a wire between those so when I press the gas pedal I also pull in that throttlebody and give the aftermarket a signal too. But then the Cruise Control stop working and the tps Will not be accurate between the two sensors (when I give 70%gas, that throttlebody may give a 80% reading) so it is better just take somewhere from the stock system, just the fact that it has to work :lol:

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Re: V70R-00 transmission

Post by Keith Morganstein » Sat Nov 10, 2018 9:54 pm

Duren wrote:
Sat Nov 10, 2018 7:52 am
This thread is in wrong catergory in this forum, what I originally planning on asking was about controlling tcu with aftermarket, but Keith awnsered no and I belive him. And just for that i think i leave that system as alone as possible

And then it all came to be all about the ECU (engine), I wonder how the tps is best solved, is it by conneting into a well selected cable between Ethrottle body and ecu or between ecu and tcu (IF we can vall transmission control unit tcu) in order to make the Cruise Control work. Another way I can take the information is by just drilling a hole in the gas pedal and simply take a 850 thottle body with a tps and fit it someplace neat under the dashbord and just run a wire between those so when I press the gas pedal I also pull in that throttlebody and give the aftermarket a signal too. But then the Cruise Control stop working and the tps Will not be accurate between the two sensors (when I give 70%gas, that throttlebody may give a 80% reading) so it is better just take somewhere from the stock system, just the fact that it has to work :lol:
I would not assume tps is the only input required. It’s seems like a very integrated management system. Engine, transmission, brakes, instrument panel, all networked together.




I would expect that being in Sweden, the motherland for these cars, there would be a lot of people with Vadis to diagnose it.

The throttle body is another big issue on these cars. The common failure is the TPS on the side of it. I’ve reworked them installing a non-contact sensor. The TPS and the MAF sensor can cause similar issues with engine stability.

Is there any engine surging, any ETS light?

Do you ever lose the speedometer, odometer, have transmission shifting issues or random transmission codes?
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Duren
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Re: V70R-00 transmission

Post by Duren » Sun Nov 11, 2018 5:17 am

Yes there is alot of People that knows these cars in and out, and I have searched many hours and asked and asked and asked so that people is tired of me, and this car is so rare in terms of hobby cars, they dont get this type of custom, they more get styled and Still work as dailys Still. The manual transmission 850 is NO problem att all but auto v70 is more rare to tune. the only symptomes in this specific car is poor fuel consumption and a light in the dashbord. Hp, Cold start, reliability and so on is no problem.

And the only a "ecu master mecanic at the volvo garage in the town and me" can see is totally wrong is the maf reading, and the sensor is changed, the wiering harness is also a issue in these cars,

The throttlebody is changed (Volvo original upgraded) just when I bought the car a year ago

Try to fołlow me in this. The tps Signal is the only i worry about beacuse that signal is the only i find that I need to connect the stock system and the aftermarket. The other sensors i have the stock sensors left alone in this car to make the stock ecu "happy" so that ecu controls the tcu, and all other things in the car,
And get another set of sensors to make the new aftermarket work and control the engine with that.

Do you understand my plan??

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