Powertrain Control Module (PCM): Notes

The center of the electronic engine control (EEC) system is a microprocessor called the PCM. The PCM receives input from sensors and other electronic components. Based on information received and programmed into its memory, the PCM generates output signals to control various relays, solenoids, and actuators. The hybrid vehicle uses a 128 pin PCM which has three separate electrical harness connectors.

Fig 1: Identifying Powertrain Control Module (PCM) Connectors (E, B And T)