speed sensors Archives - Transmission Digest
Erratic Downshifting Ford F-250

Our shop recently took in a 1995 Ford F-250 with erratic downshift concerns. I started the initial evaluation with a visual inspection, fluids check, and a code scan. When scanning for codes, I was a little surprised that there weren’t any stored; per the customer concern, I was expecting an MLPS or a VSS code

42RLE: 1st-Gear Shift Shuttle in Drive

This article, yet another pointing out cross-connect scenarios, has to do with the 42RLE input-shaft and output-shaft speed sensors.

Sometimes It’s Not So Bad When It’s Bad

The input-shaft and output-shaft speed sensors used in the AF23/33-5 (AW55-50SN) are two-wire Hall-effect sensors, which means they are supplied with a voltage source on one wire and send a signal back to the computer on the remaining wire.

Repeat Performance, Not by Popular Demand

You may recall that the 4L80-E made its appearance in 1991. And whether it was in two-wheel-drive or four-wheel-drive configuration, the output carrier had the exciter ring for the output-shaft-speed (OSS) sensor pressed onto it.

Getting Up to Speed

There are basically three different styles of speed sensors a transmission diagnostician has to deal with: a reed switch, an AC generator (pulse generator) and a Hall-effect sensor.