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.
The EVAP system is not the cause of the symptom. RETURN to Section 3 , Symptom Charts for further direction. | INSTALL a new Evaporative Emission (EVAP) Purge valve. REFER to the Workshop Manual Section 303-13, Evaporative Emissions. CARRY OUT the EVAP Test. REFER to the instruction manual provided by the scan tool manufacturer. Clear the PCM DTCs. REPEAT the self-test. |
HX14 CHECK FOR BLOCKAGE IN THE FUEL TANK VENT SYSTEM
NOTICE: Do not allow FTP sensor voltage drop to less than 1.2 volts during this step. Excessive vacuum inside the fuel tank could trigger the vacuum release in the fuel filler cap or capless fuel filler system.
Note: The EVAP canister vent valve is normally open and venting to the atmosphere.
• Ignition ON, engine running.
• Access the PCM and monitor the EVAPCV (MODE) PID.
• Access the PCM and monitor the FTP (VOLT) PID.
• Access the PCM and control the EVAPCP (PER) PID.
• While monitoring the FTP PID, ramp open the EVAP purge valve by incrementally commanding the EVAPCP PID to 100%.
Does the FTP sensor voltage drop below 1.5 volts when the EVAP purge valve is commanded fully open?
Yes | No |
|---|---|
GO to HX15 . | For DTC P144C, GO to HX48 . For all others, GO to HX17 . |
HX15 VISUAL INSPECTION
• Visually inspect the following for blockage or contamination:
◾ the EVAP canister vent valve ◾ the EVAP canister vent valve filter ◾ the EVAP canister
Is a concern present?
Yes | No |
|---|---|
REPAIR as necessary. CARRY OUT the EVAP Test. REFER to the instruction manual provided by the scan tool manufacturer. Clear the PCM DTCs. REPEAT the self-test. | For DTC P144C, GO to HX48 . For all others, INSTALL a new Evaporative Emission (EVAP) Canister Vent valve. REFER to the Workshop Manual Section 303-13, Evaporative Emissions. CARRY OUT the EVAP Test. REFER to the instruction manual provided by the scan tool manufacturer. Clear the PCM DTCs. REPEAT the self-test. |
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.