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Home >> Chrysler >> 2011 >> 300 C, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 952 (5.7L CNG - DTCS P0606 To P2123 - 2500 Hd) >> Diagnosis And Testing >> P0627-Fuel Pump Control Circuit Open >> Theory Of Operation

Theory Of Operation

WARNING: This page is about a different car, the 2015 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

The Fuel Pump Relay is controlled by the Powertrain Control Module (PCM). The PCM controls the Fuel Pump Relay by grounding the Fuel Pump Control circuit.

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