Lexus Archives - Transmission Digest
Sonnax releases boost valve kits for Toyota transmissions

Sonnax has released new drop-in C1 and C4 apply boost valve kits (part numbers 168740-01K and #168740-02K, respectively) for Toyota’s UA80E, UA80F, UB80E and UB80F transmissions. The sleeves in these kits are manufactured from wear-resistant billet aluminum. Sonnax says these kits can prevent wear and restore proper hydraulic control in these Toyota/Lexus transmissions.

Alto adds new products for Toyota/Lexus, Nissan, Mercedes, Allison, more

Alto has released a wide variety of products this spring; TD’s roundup of all the latest products from the company is below. Filter #207942 This new filter (pictured above) covers Toyota Lexus models AA81E, GS350, IS350, RC350, (Crown Athlete 2.0L) from 2013 to present. Filter #181948B This recently introduced filter covers Nissan/Jatco/Suzuki models RE0F11A (CVT)

Toyota/Lexus U140E suddenly loses reverse

The complaint A 2002 Lexus RX300 with 3.0-liter engine and the A140F AWD Transmission developed a sudden issue: a loss of reverse and no ability to upshift out of first gear. Fault code P0750 “Shift Solenoid SL1 Performance Malfunction” was set. Scan tool data did indicate that the transmission range sensor was operating properly, and

Toyota/Lexus U660E/F, U760E/F Oversized C2 Apply Control Valve Kit

Toyota/Lexus U660E/F and U760E/F transmissions may exhibit 3-4 shift flares, slipping in 4-5-6, and burnt C2 clutches due to wear in the C2 apply control bore. Sonnax oversized C2 apply control valve kit (p/n 47740-63K) restores the necessary hydraulic clearances required for proper valve function while protecting against premature wear.

Toyota/Lexus Oversized B1 Apply Control Valve Kit

Vehicles with Toyota/Lexus U660E and U660F transmissions may exhibit 2nd and 6th Gear shift complaints and burnt B1 clutches. This can be caused by wear at the valve and/or boost valve and sleeve, which leads to improper valve function. Reconditioning the bore and installing the Sonnax oversized B1 apply control valve kit 47740-57K will restore

Toyota/Lexus U660E/F, U760E/F Remanufactured Valve Bodies

Three new, premium-quality remanufactured valve bodies allow rebuilders to easily address a variety of common concerns.

Toyota/Lexus Oversized Converter and Lube Relief Check Valve Kit

This new Sonnax product is made to re-establish correct clearance for converter and lube functions.

Understand Systems Involved in Diagnosis

A while back we had a customer come into our shop stating, “The vehicle sometimes has a VSC (Vehicle Stability Control) error and won’t go past fourth gear, but today it seems fine.” The vehicle was a 2007 Lexus LS460 with 132,561 miles, and equipped with an AA80E 8-speed transmission and a 4.6L engine. As with routine diagnosis, I started with a road test, a scan of all modules, and an undercar inspection.

No-Start after Fender Bender

When the ’96 Lexus was dropped at our door, it came with a simple concern: “Vehicle stopped running following accident. Airbags have deployed.” A trip to the ES300 confirmed that both airbags had indeed “popped” (Figure 1). With just over 100K on its odometer, and needing two airbags and a new front bumper, I wondered if this vehicle was worth saving. My customer was motivated to have us dig into the diagnosis, so we accepted the challenge.

Solving a No-Movement Puzzle

I have always loved the challenge of working on those “puzzlers.” So, when one came to my bench recently I knew I would definitely take the challenge.

This was the day the 1996 Lexus GS300 with an A350E transmission came as a tow-in with no movement.

Toyota’s U660E Flex Lockup Control

Toyota’s six-speed U660E (Figure 1) uses a converter-clutch strategy called flex lockup control. A partial explanation of this flex control strategy by Toyota follows:

During acceleration, flex lockup-clutch control operates when the transaxle is in second gear or higher and the shift lever is in the D, S6, S5 or S4 range position. During deceleration, it operates when the unit is in fourth gear or higher and the shift lever is in the D, S6, S5 or S4 range position.

U151/U250 Solenoid Information

The U151 and U250 are five-speed transaxles that are used in the Lexus ES300, ES330, RX330 and RX350 as well as many Toyota vehicles from 2004 on. The U250 is used behind the 2.4-liter four-cylinder engine, and the U151 is used behind the 3.0-, 3.3- and 3.5-liter V-6 engines. The U151E and the U250E are front-wheel-drive transaxles, and the U151F is an all-wheel-drive transaxle.