Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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.
| 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 |
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.