Removal & Installation
Some PCM's use a CALPAC as well as a PROM. See Fig 1. The CALPAC must also be removed from old PCM and installed in new one. Removal and replacement procedures for CALPAC are same as for PROM. See PROGRAMMABLE READ-ONLY MEMORY (PROM) . If units are installed improperly, grounding diagnostic test lead will set Code 52.