P1234 FORD, LINCOLN, MAZDA, MERCURY: FUEL PUMP DRIVER MODULE DISABLED OR OFFLINE
POST UPDATED IN June, 2023
P1234 FORD, LINCOLN, MAZDA, MERCURY: FUEL PUMP DRIVER MODULE DISABLED OR OFFLINE
The fuel pump is used in the combustion system of vehicles and its purpose is to transport fluid from the fuel tank to the engine. Fuel injection engines typically use electric pumps located inside the fuel tank. The fuel pressure must meet certain specifications in order to achieve optimum engine performance.
The fuel pump control module checks the voltage supply to a vehicle’s fuel pump. Monitoring the voltage, the module sustains optimum fuel pressure and fuel flow to the engine over its entire operating range.
The Powertrain Control Module (PCM) monitors the FPM (Fuel Pump Monitor) circuit from the Fuel Pump Driver Module (FPDM). The key on the FPDM continuously provides a duty cycle signal to the Powertrain Control Module via the FPM circuit. In the event that the PCM stops receiving the duty cycle signal, the test fails and the P1234 OBDII diagnostic code will be set.
The reasons for the P1234 OBD2 fault code are as follows:
The corresponding steps to troubleshoot the DTC P1234 OBDII code are: