Pinpoint Test C : DTC P04B4: Notes

Diagnostic Routine(s) 

DTC P04B4 

Diagnostics in this information assume a certain skill level and knowledge of Ford-specific diagnostic practices. For information about these practices, REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).

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 FTP 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)