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Dodge Durango
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Fuel System » Fuel injection system » Description and operation
Auto shutdown (asd) relay-pcm output

DESCRIPTION

The 5-pin, 12-volt, Automatic Shutdown (ASD) relay is located in the Power Distribution Center (PDC). Refer to label on PDC cover for relay location.

OPERATION

The ASD relay supplies battery voltage (12+ volts) to the fuel injectors and ignition coil(s). With certain emissions packages it also supplies 12-volts to the oxygen sensor heating elements.

The ground circuit for the coil within the ASD relay is controlled by the Powertrain Control Module (PCM). The PCM operates the ASD relay by switching its ground circuit on and off.

The ASD relay will be shut-down, meaning the 12-volt power supply to the ASD relay will be de-activated by the PCM if:

  • the ignition key is left in the ON position. This is if the engine has not been running for approximately 1.8 seconds.
  • there is a crankshaft position sensor signal to the PCM that is lower than pre-determined values

The PCM will sense if or when the ASD relay has been activated through a "sense circuit". Refer to Automatic Shut-Down (ASD) Relay Sense-PCM Input for additional information.

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    Dodge Durango Service Manual / Fuel System / Fuel injection system / Description and operation / Auto shutdown (asd) relay-pcm output

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