DTC P0230: Fuel Pump Relay Control Circuit: Description

The fuel pump relay is located in the Underhood Fuse Block (UHFB). The ECM controls the fuel pump motor by supplying a ground to the fuel pump relay coil whenever the engine is cranking or running. When the fuel pump relay is commanded OFF (circuit not grounded), the voltage level at the ECM should be high (ignition voltage). When the fuel pump relay is commanded ON (circuit grounded), the voltage level at the ECM should be low. The ECM fuel pump relay feedback circuit uses a pull-up voltage (2.6-4.6 volts), which allows the ECM to individually differentiate between an open, short to ground or short to voltage. During engine crank, the ECM will command the fuel pump relay OFF for a very short amount of time during which it will test for an open/low voltage condition. This test is only performed once during engine crank. DTC P0230 will set if the ECM detects an open fuel pump relay control circuit when fuel pump relay is commanded OFF with engine cranking.