You can now enjoy smoother shifts, and peace of mind that your tranny will last much longer now that you've changed out the worn fluid. Now that the transmission fluid has been changed, take the vehicle for a test drive and make sure all the gears shift smoothly. You can also use Toyota's own techstream software paired with a MVCI cable to determine ATF fluid temperature. When the P and D lights are both lit green, the fluid is at the optimal temperature for checking its level. This will put it in fluid temperature detection mode. Then put it back into D and oscillate quickly between N and D for at least 6 seconds.
Shift the transmission into S, go from first to sixth gear, then back to P. Turn the vehicle on, this will put it in diagnostic mode, with a higher than normal idle, and lots of scary lights flashing on the dashboard. To measure the transmission fluid without expensive scan tools, short pins 4 and 13 on the OBDII port under the dash. Excess fluid will flow through the straw and drain once you remove the bolt. Above the overflow bolt is a straw which determines the level of the fluid when the temperature is correct. Instead of a dipstick, sealed transmissions have an overflow bolt that's removed when the transmission is at a specific temperature, in this case, 104F. Its also a good idea to drop the pan and replace the filter, here's a write-up on that:
Here's a full DIY Write-up on the fluid change procedure for reference: This procedure is similar to recent models Lexus and Toyota FWD and AWD models, with the exception that the transmission is mounted transversely, including the Lexus ES350, RX350, Toyota Avalon, Camry, Highlander, Sienna and Venza. This procedure is the same for most recent model Toyota and Lexus RWD and 4WD vehicles, including Lexus IS250, IS350, GS350, LS460, GX460, Toyota 4Runner, Tacoma, Tundra and Sequoia. However, transmission fluid does wear out overtime, and if you want to prolong the life of your transmission, its a good idea to change the fluid frequently. Toyota claims the transmission in its modern cars is a sealed unit, and the fluid inside is good for the lifetime of the vehicle. Here's how to change the automatic transmission fluid in a Toyota or Lexus with no dipstick.
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