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Electronic Control Module & Prom: Installation

  1. To install PROM, check that new PROM has same service number as the one being replaced. 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 that reference notch in both ECM and PROM are properly aligned. If PROM is installed backwards and key is turned on, PROM will be destroyed.
  2. Install PROM access cover on ECM. To install ECM, reverse removal procedure. Turn ignition on and enter diagnostics. See ENTERING OR EXITING DIAGNOSTIC MODE in this article. Code 12 should flash 4 times to indicate that PROM is installed properly. No other codes should be present.
  3. If Code 51 is displayed, PROM is not fully seated in ECM, is installed backwards, has bent pins, or is defective. If pins are bent and crack when straightened, PROM must be replaced. If PROM is installed backwards or is defective, it must be replaced.
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