Powertrain Control Module (PCM) And Location: Notes

The PCM is the control center for the engine powertrain system. The PCM monitors the information from various sensors, and controls the systems that affect the vehicles performance and emissions. The PCM and the transmission control module (TCM) are stand-alone modules. The PCM and the TCM communicate through the control area network (CAN). The F-650/F-750 PCM has a 3 pocket connector assembly with a total of 222 pins. F-Series Super Duty has a 3 pocket connector assembly with a total of 306 pins. The 74 pin connector is dedicated to chassis related inputs, outputs, powers and grounds. The 98 pin connector is dedicated to engine control related inputs, outputs such as the fuel injectors, camshaft, crankshaft sensors and the turbocharger systems. The 50 pin connector is dedicated to the exhaust aftertreatment components. The PCM receives input from sensors and other electronic components (switches and relays) and places this information into random access memory (RAM) or the electronically erasable programmable read only memory (EEPROM). Based on information programmed into its read only memory (ROM), the PCM generates output signals to control various relays, solenoids, and actuators. The PCM controls these output circuits by controlling the ground or the power feed circuit through the transistors or an output driver module.