The pressure gauge indicates open if air pressure is passed through the solenoid, or closed if the solenoid is unable to pass air through. We will be finishing the last part of this series next week and it will inlcude some extremely vital and more important info for the 6T40 transmission. This can cause the psi gauge to flicker high and low as the valves open and close. Gear changes from second to sixth gear ratios are accomplished with a precise clutch-to-clutch action, where the clutch is engaged in one gear at exactly the same time it is released in another. Derives a characteristic filling volume of the hydraulic clutch from the inflection event. Freewheeling mechanisms allow accurate timing between shifts, but also take up more space and add more components to the transmission.
This reduces the number of brake applies for the driver to brake during a hill descent. The transmission is based on the larger , and is produced at , as well as in China. The first-to-second upshift, however, is a freewheeling action, where the second gear clutch engages while the first gear one-way clutch spins freely. Contact me with your car model! Posted by on Wednesday, June 5th, 2013 The is a six speed automatic transmission made by General Motors. Whether you need 6T40 wiring diagram information, 6T40 transmission rebuilders tips, 6T40 technical information, 6T40 diagnostics, 6T40 troubleshooting help, or just answers to your 6T40 transmission rebuilders question, the is the place to go! Many times, this is caused by excessive heat in the transmission.
Then they recommend having you let the customer drive it for a couple of weeks to see if the problems go away. Symptom: Shifting problems between gears. A re-manufactured transmission will include major internal modifications and upgrades designed to make it both stronger and more durable. A is going to include alterations and upgrades designed to fix common failure problems and extend the life of the transmission. This may cause some air to exit the ports where the psi gauge is not connected as those solenoids cycle on and off. If you get a low reading this may indicate a short in the wire. Keep An Eye Open For This Possible 6T45 Transmission Issue Posted by on Friday, October 18th, 2013 The 6T45 is a six speed automatic transmission made by General Motors.
A rebuilt transmission will not. A properly working solenoid will usually return a reading somewhere between 20 — 30 ohms. This allows a greater degree of smoothness at lower vehicle speeds. Excessive debris or metal particles on the transmission pan could be an indication that there is a transmission mechanical failure and that the transmission will need to be rebuilt or replaced. Tech notes When the a transmission solenoid is intermittent, in most cases the problem is not the electrical part of the solenoid; the problem is foreign material obstructing the mechanical function of the solenoid or the flow of the fluid through the transmission valve body. The Hydra-Matic 6T40 transmission delivers on that promise.
The factory recommends that you re-program the computer up to three times in a row to get the problem to stop. I highly recommend doing so with a over one that was simply rebuilt, or a used one. You surely will not receive that benefit from a company that solely rebuilds transmissions. Connect the lead from your ohm meter to the two wires coming off the solenoid. The recommended shop air pressure for this test is 90-100 psi.
A reading outside this range might indicate a problem with the solenoid. Since 2008, these transmissions have been produced by at the Boryeong Transmission Plant in ,. This is usually caused by excessive heat that causes the thin protective plastic coating on the wire to melt, allowing the wire to find a shorter path of resistance. It determines an inflection event at a torque path that comprises the hydraulic clutch return spring force. One of the main electrical components in this transmission is its multiple solenoids.
Luckily these solenoids are relatively inexpensive and easy to replace. The wire that makes up the magnet can break. The fluid was validated to improve durability and shift stability over the life of the transmission. Clutch-To-Clutch Shift Operation Three planetary gearsets are used with three stationary clutches and two rotating clutches, which save space compared to freewheeling designs. Pls check the number on the transmission nameplate shows 2425xxxx or 2426xxxx.
The 6T40 transmission is used mainly behind smaller four cylinder engines and is considered a lightweight design. A re-manufactured transmission also comes with a ; three years compared to an average 90 days for a rebuilt transmission. The 6T50 is available in front-wheel or all wheel drive as well. Thanks for reading and we hope this information was just as helpful as the other 2 parts of this 4 part series. The clutch function verification is conducted on smooth roads when the transmission is not shifting and engine torque is consistent and positive. These pressure switches were originally used Gen 1 to monitor clutch operation via the solenoids and regulator valves for adaptation purposes. Malibu, Epica, Tosca, Aveo, Sonic and Equinox.
A properly functioning solenoid will usually return a reading of around 20 to 30 ohms. The transmission is also produced in ,. If the transmission fluid is very dirty, it is recommend changing the transmission fluid and if possible removing the transmission pan for further diagnosis. Another one involves hard, jerky shifts. Sixth gear, however, is an overdrive ratio, which keeps the engine revolutions lower for highway cruising, reducing engine friction losses and optimizing fuel economy. Through electronic controls, the clutch-to-clutch concept of the 6T40 delivers optimal shift timing. The wire can also develop an electrical short.
Release the air pressure in the gauge between pressurization tests. With closer tolerances, the gears are less prone to characteristic whining or humming, allowing the transmission to operate with exceptional quietness. This includes that are designed to electronically shift the transmission. The 6T45 differs from the 6T40 in its use of heavier-duty components, allowing it to handle engines with greater torque. Attention:Custom Tax Policy varies from different countries. Possible cause: This transmission is very advanced and full of electronics.