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Home >> Jeep >> 2012 >> Compass Limited, AWD, Standard >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> Electronic Control Modules (Service Information) >> Module, Powertrain Control >> Operation >> Operation >> Pcm Operating Modes >> Ignition Switch On (Engine Off)
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Ignition Switch On (Engine Off)

When the ignition is turned on, the PCM activates the glow plug relay for a time period that is determined by engine coolant temperature, atmospheric temperature and battery voltage.

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