Power Grounds

POWER GROUNDS

The Powertrain Control Module (PCM) has 2 main grounds - power grounds for engine functions and power grounds for transmission functions (if equipped with 42RLE). Both of these grounds are referred to as power grounds. All of the high current electrically noisy devices are connected to these grounds. The sensor return comes into the sensor return circuit internal to the module, passes through noise suppression, and is then connected to the power ground internal to the module so as to minimize the effects of the high current and electrically noisy devices on various sensor signals.

The power ground is used to control ground circuits for the following PCM loads:

- Fuel injectors
- Ignition coil(s)
- Certain relays/solenoids
- Certain sensors