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Programmable Read-Only Memory (Prom): Installation

  1. Ensure new PROM has same service number as old one. Place new PROM in PROM carrier. Position PROM carrier squarely over ECM PROM socket. Press on PROM carrier until PROM is firmly seated in ECM.
    NOTE: Ensure reference notches in both ECM and PROM are properly aligned. If PROM is installed backwards, PROM will be destroyed when ignition is turned on.
  2. Install PROM access cover on ECM. Install ECM in vehicle. See ELECTRONIC CONTROL MODULE (ECM) . Start engine and ground ALDL diagnostic test connector. Watch for trouble Code 51 or 52.
  3. If Code 51 or 52 sets, PROM is either not fully seated in ECM or installed backwards, has bent pins or is defective. If bent pins crack when trying to straighten, replace PROM. If PROM is installed backwards or is defective, replace PROM.
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