Circuit Description

PCM uses an Electronically Erasable Programmable Read-Only Memory (EEPROM). EEPROM contains program information and calibration required for engine, transmission and powertrain diagnostics operation. Unlike proms used in past applications, EEPROM is not replaceable. When PCM is replaced or update calibration is required, PCM must be reprogrammed using scan tool. See EEPROM PROGRAMMING PROCEDURE  under POWERTRAIN CONTROL MODULE.