Removal & Installation
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 1995 GMC Vandura, 1995 GMC Rally, 1995 GMC Pickup, 1995 Chevrolet Sportvan, and 1995 Chevrolet Pickup. However, it is still accessible from the selected car via links, so may be relevant.
Some PCM's use a CALPAK as well as a PROM. See Fig 1. The CAL PAK must also be removed from old PCM and installed in new one. Removal and replacement procedures for CALPAK are same as for PROM. See PROGRAMMABLE READ-ONLY MEMORY (PROM). If CALPAK is installed improperly, grounding DLC diagnostic test terminal will cause DTC 52 to set.