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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, and position squarely over ECM PROM socket. Press on PROM carrier until PROM is firmly seated in ECM.
    NOTE: Ensure reference notches in ECM and PROM are properly aligned. If PROM is installed backwards and ignition is turned on, PROM will be destroyed.
  2. Install PROM access cover on ECM. Install ECM in vehicle. See INSTALLATION under CONTROL UNIT. Start engine, and ground ALDL terminal "B". Watch for trouble Code 51 or 52.
  3. If this occurs, PROM is not fully seated in ECM, installed backwards, has bent pins, or is defective. If bent pins are cracked while straightening, replace PROM. If PROM is installed backwards or is defective, it must be replaced.
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