Vehicle Identification (VID) Block
WARNING: This page is about a different car, the 2004 Mercury Mountaineer and 2004 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
Some powertrain control module (PCM) may contain a memory area called a vehicle identification (VID) block. The VID block is used to store powertrain configuration information. The PCM VID block may contain the factory settings for the configurable modules unless the PCM has been flashed with a new calibration, in which case some PCM parameters may be modified.