May 2003 Archives - Transmission Digest
Zap! It’s a MAF Sensor

When a MAF sensor malfunctions, it can do so in a very subtle way. It can create an erratic or incorrect signal on initial take-off, which can cause an elongated shift. It can deliver an incorrect signal at higher engine speed, which can create shudder that could be mistaken for torque-converter-clutch (TCC) problems. It can cause coast-downshift clunks, especially as the vehicle is coming to a stop. It can even cause a slide-bump shift. It is a major input for electronic pressure control that will result in elevated line pressure.

4L80 E Converter-Clutch Failure in 2000 & Up Vehicles

If you were involved in the transmission industry when the E4OD transmissions began coming to local shops, you probably experienced the nightmare of cracked converter clutches. The primitive code-retrieval methods on the early transmissions were usually little help in finding the root cause of the problem. The aftermarket converter rebuilders recognized the cracks in the converter clutches early on. Some made vain attempts at welding the cracked converter clutches, while most others recommended a factory replacement converter.

The BorgWarner 44-11 Transfer Case, Chapter 2

In last month’s article we looked at the mechanical operation of the BorgWarner 44-11 automatic all-wheel-drive transfer case, which replaces the BW 44-05 transfer case and is used in the Ford Explorer, Ranger and Mountaineer and Lincoln Aviator models. This month’s article is devoted to the electronic functions of this transfer case.

Gaining a Little Insight

A parallel hybrid vehicle allows the power from a gasoline engine and an electric motor to drive the vehicle independently or in conjunction with one another. The Toyota Prius has such a design as well as the Honda Insight and the Civic Hybrid. Although they are all parallel hybrids, there are differing operational strategies between Toyota and Honda.

May 2003 Issue

Issue Summary:

The LJ4A-EL transaxle in a Mazda Millenia with a 2.3-liter (KJ) engine can experience severe friction damage and premature failure.

Before or after overhaul, Volkswagen/Audi vehicles equipped with 01M, 01N and 01P transaxles may exhibit a harsh 1-2 upshift, firmer-than-normal engagements, and firm upshifts to 3rd and 4th.