Powertrain Control Module (PCM)
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 150-pin PCM which has 3 separate electrical harness connectors.
TABLE 1 150-PIN PCM POWER AND GROUNDS
| Function | Description | Connector/Pin |
|---|---|---|
| VPWR | Voltage to module | B35 |
| VPWR | Voltage to module | B36 |
| PWRGND | Power ground | B47 |
| PWRGND | Power ground | B48 |
| PWRGND | Power ground | B49 |
| PWRGND | Power ground | B50 |
| CSEGND | Case ground | B10 |
| SIGRTN | Connector B signal return | B41 |
| SIGRTN | Connector E signal return | E41 |
| SIGRTN | Connector T signal return | T41 |
| VREF | Connector B Buffered 5 volt reference | B40 |
| VREF | Connector E Buffered 5 volt reference | E40 |
| KAPWR | Keep alive power | B45 |