HX: Evaporative Emission (EVAP) System — 2016 workshop reference 5225

Vehicle applicability: This diagnostic supplement covers multiple Ford vehicles and engines. Follow the application named in the source below. Some references apply to vehicles other than Mustang.

◾ Check the capless fuel tank filler pipe inlet for an obstruction that prevents it from sealing. ◾ Check the capless fuel tank filler pipe for damage.

• Install and remove the supplemental fueling adapter five times in the capless fuel tank filler pipe to clear debris on the seal and repeat the test. Refer to the Owner Literature for the location of the supplemental fueling adapter in the vehicle.

Is a concern present?

Yes	No
For repair verification, CARRY OUT the Smoke Machine PHASE 1 - Leak Verification Pressure Test. REPAIR as necessary. GO to HX44 .	For DTCs P0442 or P0456, GO to HX44 . For DTCs P0455 or P0457, GO to HX39 .

Yes

For repair verification, CARRY OUT the Smoke Machine PHASE 1 - Leak Verification Pressure Test. REPAIR as necessary.

GO to HX44 .

For DTCs P0442 or P0456, GO to HX44 .

For DTCs P0455 or P0457, GO to HX39 .

HX39 CHECK FOR FLI DTCS

• Ignition ON, engine OFF.

• Carry out the PCM self-test.

Are DTCs P0460, P0461, P0462 or P0463 present?

Yes	No
DISREGARD the current diagnostic trouble code (DTC) at this time. DIAGNOSE the next DTC. GO to Section 4, Diagnostic Trouble Code (DTC) Charts and Descriptions.	GO to HX40 .

HX40 CHECK THE OPERATION OF THE FUEL GAUGE

Note: A fuel gauge that always indicates a fuel level less than a 1/2 tank or always a full tank, may be caused by a fuel level input (FLI) concern.

• Check operation of the fuel gauge.

Is the fuel gauge functioning correctly?

Yes	No
GO to HX41 .	CHECK the functionality of the FLI circuit. RETURN to Section 3 , Symptom Charts for further direction.

Yes

GO to HX41 .

CHECK the functionality of the FLI circuit.

RETURN to Section 3 , Symptom Charts for further direction.

HX41 EVAPORATIVE EMISSION SYSTEM VISUAL INSPECTION

• Ignition OFF.

• Visually inspect for:

◾ EVAP system lines and hoses (check for correct connections, damage or blockage) ◾ loose fuel vapor hose and tube connections to the EVAP system components ◾ blocked vacuum hose between the EVAP purge valve and the engine intake manifold ◾ damaged fuel tank or fuel filler pipe

Are there any concerns found during the visual inspection?

Source reference 5225

2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.