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Home >> Cadillac >> 1982 >> Cimarron Standard Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Computer Command Control >> Removal & Installation >> Programmable Read Only Memory (Prom) >> Installation
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Programmable Read Only Memory (Prom): Installation

  1. Before installing new PROM, ensure that part number agrees with removed PROM. Ensure that molded "half-round" depression of PROM is at same end as "squared-off" symmetrical end of carrier and that PROM is centered in carrier.
    NOTE: Any time PROM is installed backwards and ignition is turned on, PROM is destroyed and must be replaced.
  2. 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 and press down on body of PROM with narrow blunt tool. Squarely seat PROM in socket by alternately pressing down on either end of PROM.
  3. Replace access cover and reinstall 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.
  4. 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 PROM. If pins break or crack during straightening process, replace PROM. If PROM is installed backwards, replace PROM.
    NOTE: Oxygen sensor may be difficult to remove when engine temperature is below 120°F (45 °C). Excessive force may damage threads in exhaust manifold or cross-over pipe.
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