EEPROM

The electronically Erasable Programmable Read Only Memory (EEPROM) is a permanent memory that is physically part of the ECM. The EEPROM is not a removable component. The EEPROM contains program and calibration information that the ECM needs in order to control the powertrain operation.

Unlike the Programmable Read Only Memory (PROM) used in the past applications, the EEPROM is not replaceable. Special equipment, as well as the correct program and calibration for the vehicle, are required in order to reprogram the ECM.