Principles of Operation
Configurable modules accommodate a variety of vehicle options, eliminating the need for many unique modules for one vehicle line. These modules must be configured when replaced as part of a repair procedure. Configurable modules should not be exchanged between vehicles since the settings are unique to each vehicle. Failure to configure a new module may result in improper operation and/or DTCs setting.
The 3 different methods of configuration are
- Programmable Module Installation (PMI)
- Module reprogramming ("flashing")
- Programmable parameters
Some modules do not support all 3 methods.
Vehicle Identification (VID) Block
Some PCMs contain a memory area called a Vehicle Identification (VID) block. The PCM VID block commonly stores powertrain configuration items such as Vehicle Identification Number (VIN), tire size, axle ratio, and whether or not the vehicle is equipped with speed control.