If the voltage disappears (or the pump quits running) with the FP relay removed then try replacing the relay with a spare one. If the voltage remains, or the fuel pump continues to run, then there is a short to voltage on the FP voltage supply circuit or on the feedback circuit. If your reading shows any voltage at all present to the fuel pump with KOEO (or if you can hear the pump running), remove the FP relay. If you don't have access to a scan tool, use a voltmeter to read the FP voltage at the fuel tank. This reading indicates what kind of voltage the fuel pump is receiving. Now, using your scan tool (if you have one) observe the FP VOLTAGE FEEDBACK reading in the datastream. This allows the PCM to complete it's fuel pump pre-cycle. Turn the KOEO (key on engine off) and wait for a few seconds. If that's the case and you can hear the fuel pump running, you may be able to disregard some of the following checks. It is possible with a P0232 for the fuel pump to be running continuously, even with the ignition off. FP relay control driver shorted to ground internally.Short to voltage on FP voltage supply circuit or feedback circuit.Potential causes of a P0232 code include: Small amount of voltage present on FP (fuel pump) voltage supply circuit due to short.MIL (malfunction indicator lamp) illumination.If the PCM sees an unexpected high voltage when the fuel pump isn't activated, P0232 may set.

As it activates the fuel pump relay, it expects to see battery voltage on the feedback circuit. The PCM monitors this feedback circuit to ensure that there is proper voltage being sent to the fuel pump. The splice is usually located close to the PCM. This is simply a circuit spliced into the voltage feed to the fuel pump. Some vehicles have a feedback on the fuel pump supply circuit. When the PCM (powertrain control module) activates the fuel pump relay, voltage is supplied to the fuel pump and it pressurizes the fuel system. The fuel pump is powered by the fuel pump relay. Although generic, the specific repair steps may vary depending on make/model. This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles. Fuel Pump Secondary (Feedback) Circuit High Voltage What does that mean?

2005 expedition fuel pump location