When you install a new TCM in these vehicles, it must be programmed with dealer-level equipment or equivalent, and the programming must be performed on the vehicle.
The new 6-speed units use a dedicated transmission control module (TCM) that resides inside the transmission, mounted to the valve body, called a TEHCM - transmission electrical hydraulic control module.
Most of these vehicles require VIN-specific programming with the computer installed in the vehicle (figure 1). Later model vehicles used EEPROM (electronic erasable programmable read only memory) chips and other non-removable storage imbedded in the computer processor. This allowed GM to use a universal computer assembly for several different models that required minor programming to make them work in each individual application. The older, pre-1990s model units used removable PROM (programmable read only memory) chips, which provide stored powertrain information specific to the vehicle application. For the record, all General Motors computers have model-specific calibrations stored in memory. GM is the first domestic manufacturer to use programmable logic computers. General Motors has been a mainstay of technological advances, and the computer power they provide in their cars doesn’t fall short of expectations. So let’s start with domestic vehicle applications: That means that swapping a “good used” computer may completely disable the vehicle, causing an expensive reprogramming trip to the dealer just to get it functioning. What’s more, beginning with some 2010 vehicles, Global A and B computer architecture began appearing. The advent of OBD-II marked a turning point for computers and programming that serves as an accurate starting point for discussing programming issues that need to be addressed on a regular basis. And to make sure we cover the more pertinent units, we’re not even going to consider the original electronic control units (ECUs) in this article. Since this is such an expansive subject, we’re going to break this information into pieces. One common question you need to consider is, “Do I need to reprogram the computer?” Knowledge of programming updates, computer issues, and system resets that need to be performed after working on the car are vital considerations that could turn a simple, profitable repair into an expensive nightmare. With all of the perplexing electronic and mechanical systems that are monitored and controlled by these onboard computers, it’s become extremely challenging for many technicians to keep up. They started as simple logic boxes and evolved into multiple, miniature supercomputers with their own LAN (local area network) systems. Programmable logic controllers (PLCs) have been with us for at least a half century now.
This includes ABS and traction control modules, too.Īnd maybe most important, you need to consider the very real possibility that a computer programming issue could be causing the customer’s driveability complaint. Today you need to look at the whole vehicle and all control modules associated with powertrain management.Ĭodes in any module involved in powertrain management may have a direct effect on the operation of the transmission. If you give a customer a quote on a job without checking for bulletins and updates, you might end up doing a job for free. If you perform a test drive without a scan tool, you’re wasting your time.
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