CVT Transmission Pressure Tests
CVT Transmission Pressure Tests
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The procedures presented here are specific to the Jatco Nissan Sentra CVT
transmission. However, these procedures can be effected on any CVT, with
the difference being the pressure ports change. Any service manual, will
show you the proper ports for the CVT you're working on.
Your first tool of choice, is a high pressure gauge, or high pressure
electronic transducer. You can also use an oscilloscope, or even better, a
graphing multi meter to record the pressure waveforms. Finally, we'll also
present a little known device, but with great usefulness. It is called, a
duty cycle controller circuit. These duty cycle circuits are now sold at
many electronic houses, and can be used to control any electrical solenoid.
Most, but not all of them, have variable voltage settings. In our case,
we'll use 12 volts.
Assuming you'll be using a pressure gauge, use the diagrams seen here, to
connect the gauge. Start the engine, and raise the vehicle up in the air,
using a shop lift. If not using a lift, do not go under the car with the
engine on. Remember that each time we change to a different pressure port,
we have to turn the engine off, since the ports are ... Get the whole story
right here in this video... Enjoy...
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200-R4 Governor and accumulator spring
The project continues to refine so to speak the overdrive 200-R4
transmission retrofitted to a 1972 Oldsmobile Vista Cruiser. Cleanliness
and patience, and being flexible too when working in cramped conditions
helps with these sort of projects. The softer shift (will still be more
firm then stock, as there is a shift kit in this transmission) will not be
detrimental to the 2nd band as it is a Kevlar one, and there is a large oil
cooler fitted to the transmission lines as well. The dust cover for the
torque converter will finally be fitted too when all is said and done.
At Monster Transmission we build more than transmissions, we build
Part of that relationship is educating clients about transmissions. We are
not here to lecture and point fingers at mistakes, but to inform how to
improve your transmission's longevity and quality.
In this tech tip Josh will show us how to remove the governor to check it
for damage. He removes an old rusty governor and compares it to a good one.
You can find more Tech Videos at :
Or give us a call at 800-708-0087
How to adjust bands and change automatic transmission fluid
This is a demonstration of how I tightened the bands of my automatic
transmission and changed the transmission fluid and filter. The vehicle is
a 1998 Dodge Ram 1500 4X4 with a 46RE transmission. This repair was done
after a transfer case repair which required removal of the propeller
shafts. With the front shaft out of the way, access to the front band
adjustment screw was better than normal. It is possible to do this with the
shaft in place, but access for demonstration is not as good. For details of
how the propeller shaft is removed, see my other videos on repairing a
Dodge transfer case oil leak.
Note that the details of how this is done, especially the torque settings
and the number of rotations backward after ideal torque, are very specific
to the 46RE transmission. Be sure the locknut is backed off enough that it
doesn't bottom out when the adjustment screw is tightened. Before ever
doing this type of procedure yourself, you should consult the dealers
repair manual and verify the specific procedure in your car.
This is an amateur demonstration done for entertainment purposes only. The
information offered here is given in good faith but with no guarantees of
accuracy or safety. Any misadventure you encounter if you decide to do
maintenance on your own vehicle is your responsibility.
Short clip of music midway through is royalty free music "The Messenger",
from Youtube creation tools, author unknown. Thunderclap sound used under
Creative Commons 3.0 license, done by RHumphries at
Dodge Durango Transmission overdrive problem
This is a 1998 Dodge Durango that the transmission was acting up when ever
you would go 60 mph and above. The symptoms were; transmission would not
stay in overdrive which caused a jerking motion on the vehicle because it
was going in and out of gear when the vehicle would reach the speed of 60
mph and above. Had terrible jerking motions at speeds of 70 mph and above
and tachometer would constantly be jumping due to overdrive dropping to
third and back to overdrive. The vehicle was road tested by a former Dodge
repair technician who has his own repair center now , he scanned the
vehicle while the symptoms were happening, nothing was showing on the
scanner that there was any problems, he said it was a transmission problem
and suggested I take to a transmission repair center. The transmission
repair center technician ran his scanner while the problem was occurring,
all it showed was the Durango computer telling the transmission to drop
down to third and back to overdrive. There was no indication why the
computer was telling the transmission to do this, no codes in the computer
at all and no indications of problems on the scanner. Transmission needed
to be serviced so while at the transmission repair shop they recommended
replacing the governor pressure solenoid and transducers sensor and said
that this could cause the problem but was not 100% sure. So they serviced
the transmission and replaced those parts and it still had the same
symptoms. So I did a Google search on this problem and found out that there
is several things that could cause the symptom or similar symptoms. One
thing that came up on Google most of the time that repaired the problem was
the throttle position sensor, I replace this part and symptoms continued.
Second in line that would fix this problem for others that were having
similar symptoms was replacing the output speed sensor which is on the
outside of the transmission, I replace this part and it fixed my problem. I
would suggest if you are having this same problem to start by replacing the
output speed sensor or throttle position sensor before replacing the
governor pressure solenoid and the transducers sensor. I am not a
professional mechanic but I do repair my own vehicles most of the time and
have been doing it since 1977 so I do have knowledge repairing without
having to go do a Google search. I hope this will help anyone else that is
having the symptom.
Monster Transmission Testing Process - The Monster Way
Monster Transmission tests every transmission for your piece of mind.
We run several test vehicles to test our transmissions. Under actual life
driving conditions we are able to accurately monitor line pressure,
temperature, shift points and shift firmness. We use various gauges to
really get a good look and idea to see whats going on inside of the
For our higher performance applications Monster Transmission is the only
transmission company in the world that tests their cars on a chassis Dyno. This allows us to
test our transmissions at speeds that we would not be able to run on the
As you can see we have a very thorough and lengthy process for building a
Monster Transmission. A transmission is a vital part of your drivetrain so
we have many checks and balances in place to make sure we live up to our
High Quality claim. We want to help protect your investment and provide you
with a transmission that shifts better, and lasts longer!
We know it isn't the easiest way, but it's the Monster way!
Looking for a Transmission? Check us out a http://MonsterTransmission.com
Or Give us a Call: 800-708-0087