Programmable Read Only Memory: Installation

1. Check that new PROM has same service number as replaced PROM. Place new PROM and carrier in ECM. Press on PROM carrier until PROM is firmly seated in ECM. Make sure that reference notches in ECM and PROM are properly aligned.
2. Reinstall PROM access cover and screws. Reinstall ECM in vehicle as previously described.

Fig 1: DEC System Component Locations for Trucks & Vans