Toyota Archives - Page 3 of 4 - Transmission Digest
Toyota A750E Electrical Component Variations

Toyota has been producing automatic transmissions almost from the beginning of time achieving various levels of success in durability within their fleet. Over the years there have been incidents of Toyota developing transmissions for other car companies, domestic and overseas.

Double Jeopardy

A 2002 Highlander 3.0L using the U140 transmission comes back to Pedro Seda’s shop in Puerto Rico. He had rebuilt it two years prior to its return where it had worked flawlessly during this time. Then, in an instant, it went from flawless to faulty. The transmission suddenly lost reverse and would no longer shift into fourth gear. When reverse was selected an engagement was felt yet the vehicle did not move in reverse.

Checking on Accuracy of Dyno Tests

The focus of this article is the Toyota AB60, as it has a nice balance of five on/off solenoids: S1, S2, S3, S4, and SR. In addition to those, there are 4 PWM solenoids: SL1, SL2, SLT, and SLU, which all operate at about 335 Hz. The test vehicle is a 2008 Toyota Tundra equipped with a 5.7L engine.

Serviceability Report: Toyota Highlander

Once more we will examine a new model that has just been re-engineered. Is fixing and maintaining a 2014 Toyota Highlander less difficult than fixing and maintaining the earlier model? Were technicians considered at the design stage? Let’s find out. Let’s examine the 2008 Highlander V 6 all-wheel-drive (AWD) system and compare it with the current 2014 model.

Basic Test Solves Intermittent Issue

Those of us who worked on vehicles that predated mandated catalytic converters and gas shortages can remember a wonderful time when even the most-complex electrical systems could be diagnosed with a simple test light. Computers were just starting to transform from behemoths that took up entire rooms in buildings to something that could actually fit on your desk. And there were only four wires connected to the transmission. Yes, youngsters, I said four. Those were the days.

Toyota A750E/F Small Parts

Toyota A750E/F

There are some pitfalls that can trip you up with this valve body.

Vacuum Testing Toyota U140E/240E/241E

From the TASC Force we reprint a series of in-depth test instructions for checking the serviceability of valve bodies.

It’s Not in the Manual

A while back one of our members called the tech line about a 2002 Toyota Sequoia that required replacement of the valve body. After the valve body was installed the vehicle had no reverse, pulled forward in neutral but drove perfectly when the selector lever was in the overdrive position.

RAV4’s Transmission Dilemma Presents Challenge

The code chart for the P0770 shift-solenoid-E malfunction has a simple description of the diagnostic trouble code (DTC) checking condition: It says that the lockup does not occur during lockup range (50 mph) or lockup remains on during lockup-off range. The possible causes listed are that the shift-solenoid valve is stuck open or closed, the valve body is blocked or stuck, or the clutch is locked up.

A750E/F, A760E/F/H, A761E

Many times you can make a difficult task much easier by using the correct tool. Removing the B1-accumulator retainer on the A750E/F, A760E/F/H and A761E valve bodies can be very tough.

Gen I Prius Crank No-Start Presents a Challenge

Crank no-start problems can be challenging when you’re dealing with a high-voltage (HV) battery. But specializing in hybrids has been one of the best decisions I’ve made. I have always enjoyed the challenge of working on “hard to find” drivability and electrical problems.

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.