Pinpoint Test C : DTC P04B4: Notes

Diagnostic Routine(s) 

Diagnostics in this article assume a certain skill level and knowledge of Ford-specific diagnostic practices. For information about these practices, REFER to: Diagnostic Methods .

Refueling Valve opens to depressurize the tank on Fuel door button press.

On the instant of button press when the pressure or vacuum in the tank is higher than a safe refuel range (0.36 Psi (9.97 In.H20)), the refilling valve opens to depressurize the tank to enable a safe refuel (Tank Pressure at 0.25 PSI (6.93 In.H2O)).

This pinpoint test is intended to diagnose the following: 

Possible Sources: 

• Broken refueling valve
• Broken FTPT sensor

Check for any of the circuit codes (P04BA, P04C1, P04C2, P04C9, and P04CD) related to the door operation prior to following the test procedure below)