ECM "Ed99" Data Code
The ECM Programmable Read-Only Memory (PROM) identification number is displayed as a number up to 3 digits long which can be used to verify that proper PROM is installed in ECM.
The ECM Programmable Read-Only Memory (PROM) identification number is displayed as a number up to 3 digits long which can be used to verify that proper PROM is installed in ECM.