What is the automotive PCM module?

[VeraRose]

Automotive PCM module is the engine control module. Here are the detailed introductions: 1. PCM is used for power output control. It receives sensor signals and performs complex calculations to control fuel supply, air distribution (electronic throttle), injection and ignition timing, intake pressure adjustment. It also determines the engine compensation control coefficient based on temperature, load, knock, combustion conditions, etc. 2. PCM also performs system diagnostic functions, capable of identifying operational faults. It alerts the driver through the MIL (Malfunction Indicator Lamp) and stores identified diagnostic trouble codes. It helps technicians complete repairs by distinguishing fault locations. 3. The engine control calibration program is stored in an electrically erasable programmable read-only memory (EEPROM), which is a permanent memory soldered onto the ECM and cannot be replaced separately. When replacing the ECM, the new ECM must be programmed according to the configured vehicle model before it can be used.