In many instances, during the repair process it is necessary for us to disconnect the battery or the computer. Sometimes this is all it takes to create a problem in the vehicle that was not there before.
Let’s take a look at some of these “disconnect”-related problems and how to correct them should this happen to you.
Many technicians are familiar with the problem of early shift scheduling on the 4L80-E transmission. This prob¬lem is caused by a 4×4 low range signal being sent to the computer at an inappropriate time. Vehicles equipped with the E4OD/4R100 transmission may also have this type of problem. A code 47/633 is usually your first clue in identifying this condition. Since Ford uses the same wiring harness in both 4-wheel drive and 2-wheel drive vehicles, you may find code 47/633 in both types of vehicles.
One of the many automotive animals that technicians have to wrestle with is finding the definitions for the ever-increasing number of diagnostic codes. And then, of course, their definitions are being represented by a seemingly endless list of acronyms associated with that code. TCC, VSS and TPS are just a few recognizable acronyms in our industry today.
The present trend toward larger and heavier-duty pickups has now brought the ZF S6-650 6-speed manual gearbox onto the scene. This 6-speed transmission was introduced in 1999 in the Ford F 250, F 350, F 450, F 550 and stripped-chassis models. It has been used behind diesel engines from 1999 to current production and behind gasoline engines starting in 2002 models. GM adopted the S6-650 transmission for use in its 2500 and 3500 heavy-duty pickups behind both gas and diesel engines in the 2001 model year.
In This Issue
1987-90 Acura Legend: Controller Locations
When a code is stored in 1987-90 Acura Legends, there may be confusion in locating the A/T controller to read the blinking light for codes. In many cases the technician has mistakenly located the engine controller or is trying to find and jump a diagnostic connector that doesn’t exist.