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.
HX16 CHECK FOR A BLOCKED FUEL VAPOR TUBE BETWEEN THE FTP SENSOR AND THE FUEL TANK
• Ignition OFF.
• Remove the fuel vapor tube assembly. Refer to the Workshop Manual Section 303-13, Evaporative Emissions.
• Visually inspect the fuel vapor tube for a blockage between the FTP sensor and the connection to the fuel tank or fuel pump module.
• Visually inspect the connection at the fuel tank or fuel pump module for a blockage.
Is a concern present?
Yes | No |
|---|---|
REMOVE the blockage. GO to HX17 . | GO to HX17 . |
HX17 CHECK FOR A STUCK OPEN EVAP PURGE VALVE
• Install the fuel vapor tube assembly if removed in the previous step.
• Install the fuel filler cap or remove the supplemental refueling adaptor.
• Ignition ON, engine OFF.
• Access the PCM and monitor the FTP (PRESS) PID.
• Record the FTP PID value.
• Ignition ON, engine running.
• Access the PCM and control the EVAPCP (PER) PID.
• Close the EVAP purge valve by commanding the EVAPCP PID to 0%.
• Access the PCM and control the EVAPCV (MODE) PID.
• Close the EVAP canister vent valve by commanding the EVAPCV PID to ON (100% duty cycle).
Does the FTP PID decrease?
Yes | No |
|---|---|
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. | For DTC P144A, Clear the PCM DTCs. REPEAT the self-test. For all others, GO to HX18 . |
HX18 EVAP PURGE VALVE TEST
• Access the PCM and control the (MODE) PID.
• Ignition ON, engine running.
• Access the PCM and control the EVAPCV (MODE) PID.
• Close the EVAP canister vent valve by commanding the EVAPCV PID to ON (100% duty cycle).
• Access the PCM and monitor the FTP (PRESS) 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 PID decrease?
Yes | No |
|---|
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.