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.
Does the FTP PID decrease, the engine RPM change, or the engine stall, as an indication that the EVAP purge valve is stuck open?
Yes | No |
|---|---|
INSTALL a new Evaporative Emission (EVAP) Purge valve. REFER to the Workshop Manual Section 303-13, Evaporative Emissions, Clear the PCM DTCs. REPEAT the self-test. | For Ecosport, Edge, Escape/Kuga 1.6L, Escape/Kuga 2.0L, Expedition, Explorer 2.3L, Explorer GTDI 3.5L, F-150, Fiesta, Flex GTDI 3.5L, Focus 1.0L GTDI, Focus 2.0L GTDI, Focus 2.3L, Fusion 1.5L, Fusion 2.0L, KA, MKC, MKS 3.5L, MKT 2.0L, MKT 3.5L, MKX, MKZ 2.0L, Mustang 2.3L, Mustang 3.7L, Navigator, Taurus 2.0L, Taurus GTDI 3.5L, Transit and Transit Connect 1.6L with DTCs P0171, P0174, P2195 or P2197, GO to H7 . For DTCs P0172, P0175, P219A or P219B, GO to H11 . For Ecosport and KA with DTC P2196, GO to H11 . For all others with DTCs P2196 or P2198, GO to H10 . For all others, GO to H6 . |
H6 CHECK FOR THE PRESENCE OF A VACUUM LEAK
Note: All PIDs may not be available on all vehicles.
Note: Fuel trim values at idle are more sensitive to a vacuum leak. The vacuum leak (unmetered air) represents a larger portion of the total airflow at idle than at part throttle.
Note: When calculating the total fuel correction in the following steps, if LONGFT1 equals +13% and SHRTFT1 equals +23%, the total fuel correction for bank 1 equals +36%. If LONGFT2 equals +24% and SHRTFT2 equals -3% the total fuel correction for bank 2 equals +21%.
Note: If the freeze frame ECT or ECT1 PID is available, stabilize the engine at the temperature recorded by the freeze frame ECT or ECT1 PID. If the freeze frame ECT or ECT1 PID is not available, maintain the engine coolant temperature between 82°C - 101°C (180°F - 215°F) and the intake air temperature less than 46°C (115°F).
• Ignition ON, engine running.
• Access the PCM and monitor the CHT (TEMP), ECT (TEMP), ECT1 (TEMP) and IAT (TEMP) PIDs.
• Access the PCM and monitor the LONGFT1 (PER), SHRTFT1 (PER), LONGFT2 (PER) and SHRTFT2 (PER) PIDs.
• Allow the engine to stabilize at the temperature necessary to recreate the concern.
• Mathematically add and record the LONGFT PID value to the SHRTFT PID value for each bank, for a total fuel correction at idle.
• Increase the engine speed to 3,500 RPM for 10 seconds.
• Record the LONGFT1, SHRTFT1, LONGFT2, and SHRTFT2 PID values.
• Mathematically add and record the LONGFT PID value to the SHRTFT PID value for each bank, for a total fuel correction at 3,500 RPM.
Is the total fuel correction value difference between idle and 3,500 RPM, less than 15 percent of the total value at idle?
Yes | No |
|---|---|
GO to H8 . |
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.