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Programmable Read-Only Memory (Prom): Installation

  1. Ensure new PROM has same service number as original. Position PROM squarely over PCM PROM access hole. Press on outer edges of PROM until PROM is firmly seated in PCM.
    NOTE: Ensure reference notches in both PCM and PROM are properly aligned. If PROM is installed backward, PROM will be destroyed when ignition is turned on.
  2. Install PROM access cover on PCM. Install PCM in vehicle. See POWERTRAIN CONTROL MODULE (PCM) . Start engine and enter diagnostics. See appropriate TESTS W/CODES article. Check for diagnostic trouble codes. See appropriate TESTS W/CODES article for code identification.
  3. If code(s) sets, PROM is either not fully seated in PCM or installed backward, has bent pins or is defective. If bent pins crack when trying to straighten, replace PROM. If PROM is installed backward or is defective, replace PROM.
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