Circuit Description

The engine control module (ECM) used in this vehicle utilizes an electrically erasable programmable read-only memory (EEPROM). The EEPROM contains program information and the calibrations required for engine, transmission, and engine diagnostics operation.

Unlike the PROM used in past applications, the EEPROM is not replaceable. When the ECM is replaced or a calibration update is required, the ECM must be programmed using a Tech 2. Refer to EEPROM Programming .