Toyota
Jeep Cherokee
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Fuel system » Fuel injection system » Description and operation
Power grounds

OPERATION

The Powertrain Control Module (PCM) has 2 main grounds. Both of these grounds are referred to as power grounds. All of the high-current, noisy, electrical devices are connected to these grounds as well as all of the sensor returns. The sensor return comes into the sensor return circuit, passes through noise suppression, and is then connected to the power ground.

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

  •  Generator field winding
  •  Fuel injectors
  •  Ignition coil(s)
  •  Certain relays/solenoids
  •  Certain sensors
    More about «Description and operation»:

    Powertrain control module (PCM)

    Modes of operation

    Automatic shutdown (asd) relay sense-pcm input

    Battery voltage-pcm input

    Brake switch-pcm input

    Five volt sensor supplies-primary and secondary

    Fuel level sensor-pcm input

    Engine coolant temperature sensor-pcm input

    Extended idle switch-pcm input

    Oxygen sensor-pcm input

    Ignition circuit sense-pcm input

    Intake manifold air temperature sensor-pcm input

    Manifold absolute pressure (map) sensor-pcm input

    Oil pressure sensor-pcm input

    Power grounds

    Power steering pressure switch- pcm input

    Sensor return-pcm input

    Throttle position sensor (tps)-pcm input

    Vehicle speed and distance sensor- pcm input

    Auto shutdown (asd) relay-pcm output

    CCD bus (+/-) circuits-pcm outputs

    Data link connector-pcm input and output

    Fuel injectors-pcm output

    Fuel pump relay-pcm output

    Idle air control (iac) motor-pcm output

    Radiator fan relay-pcm output

    Throttle body

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