Programmable Read Only Memory (Prom): Installation

Place replacement PROM with leads pointing downward on a flat hard surface. Check part number of new unit to be sure it is the same as one being replaced.

Fig 1: PROM "Chip" Location
Courtesy of CHRYSLER GROUP, LLC
Press insertion tool firmly onto unit with reference paint stripe visible. Locate reference end of PROM to reference end of socket ("U2" stamped next to socket). Lightly mate unit with socket.
Inspect unit to be sure it is aligned properly and that no pins are bent. Now, fully install unit by pressing down firmly on insertion tool. Remove tool, install access cover and install ECM to vehicle. Start engine and observe "CHECK CARB" display for trouble codes.
NOTE: If trouble code 51 is present after replacement, new unit is either installed backwards, is defective, is not fully seated or has bent pins. Whenever PROM is installed backwards and ignition is switched on, unit will be destroyed. In this event, replace unit.

Fig 2: PROM Removal and Installation Procedure Showing Insertion/Extraction Tool
Courtesy of CHRYSLER GROUP, LLC