Programmable Read Only Memory: Installation
- Before installing new PROM, ensure part number agrees with removed PROM. Molded "half-round" depression of PROM must be installed at same end as "squared-off" symmetrical end of carrier. Make sure that PROM is centered in carrier.
- Position carrier squarely over PROM socket with "squared-off" symmetrical end of carrier aligned with small notch in socket. Press down firmly on top of carrier while pressing down on body of PROM with narrow, blunt tool. Squarely seat PROM in socket by alternately pressing down on either end of PROM.
PROM must be installed properly. If ignition is turned on with PROM installed incorrectly, the PROM will be destroyed.
- Replace access cover and install ECM. Reconnect electrical connectors and start engine. Enter diagnostics and check for trouble code "51". If trouble code "51" does not appear, PROM is correctly installed.
- If code "51" does appear, PROM is not fully seated, is installed backwards, has bent pins, or is defective. Remove ECM and fully seat PROM. If pins are bent, remove PROM, straighten pins and reinstall. If pins break or crack during straightening process, replace PROM. If PROM is installed backwards, it must be replaced.