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Dodge Durango
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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.

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    Dodge Durango Service Manual / Fuel System / Fuel injection system / Description and operation / Ignition circuit sense-pcm input

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