Dodge Durango

 Service Manual

Fuel System » Fuel injection system » Description and operation
Ignition circuit sense-pcm input

DESCRIPTION

This circuit ties the ignition switch to the Powertrain Control Module (PCM).

OPERATION

The ignition circuit sense input tells the PCM the ignition switch has energized the ignition circuit.

Battery voltage is supplied to the PCM through the ignition switch when the ignition is in the RUN or START position. This is referred to as the "ignition sense" circuit and is used to "wake up" the PCM.

Voltage on the ignition input can be as low as 6 volts and the PCM will still function. Voltage is supplied to this circuit to power the PCM's 5 volt primary and 5 volt secondary circuits. This allows the PCM to perform fuel, ignition and emissions control functions.

Powertrain control module (pcm)

Modes of operation

Automatic shutdown (asd) relay sense-pcm input

Battery voltage-pcm input

Brake switch-pcm input

Engine coolant temperature sensor-pcm input

Five volt sensor supplies-primary and secondary

Ignition circuit sense-pcm input

Intake manifold air temperature sensor-pcm input

Manifold absolute pressure (map) sensor-pcm input

Oil pressure sensor-pcm input

Oxygen sensor (o2s)-pcm input

Power grounds

Power steering pressure switch- pcm input

Sensor return-pcm input

Throttle position sensor (tps)-pcm input

Vehicle speed and distance-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

Oxygen sensor heater relays-pcm output

Radiator cooling fan relay-pcm output

Throttle body