Circuit Description
WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
The DTC P0629 Fuel Pump Relay Control Circuit High Voltage diagnostic detects an incorrect voltage on the coil control circuit. The fuel pump relay, is controlled by the powertrain control module (PCM). The PCM energizes the relay coil for 2 seconds when the ignition switch is first turned ON and when ignition system reference pulses are detected. The fuel pump relay supplies ignition positive voltage to the fuel pump.