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.
Clear the PCM DTCs. REPEAT the self-test.
HN21 CHECK THE VACUUM SYSTEM
• Disconnect the vacuum supply tube from the inlet of the TCBY solenoid.
• Disconnect the vacuum control tube from the outlet of the TCBY solenoid.
• Using a suitable adaptor, connect the vacuum supply tube to the vacuum control tube.
• Disconnect the vacuum supply tube from the vacuum pump.
• Using the DSL ENG Pressure Test Kit 014-00761 or equivalent, apply 33.86 kPa (10 in-hg) of vacuum to the vacuum supply tube.
Does the vacuum remain steady?
Yes | No |
|---|---|
INSTALL a new TCBY solenoid. REFER to the Workshop Manual Section 303- 04, Fuel Charging and Controls, Turbocharger. Clear the PCM DTCs. REPEAT the self-test. | A vacuum system leak or restriction is the cause of the concern. DIAGNOSE the vacuum system leak or restriction. REPAIR as necessary. Clear the PCM DTCs. REPEAT the self-test. |
HN22 CHECK THE TURBOCHARGER WASTEGATE SOURCE VACUUM
• Disconnect the vacuum supply tube from the vacuum pump.
• Using the DSL ENG Pressure Test Kit 014-00761 or equivalent, measure the vacuum at the vacuum pump.
• Ignition ON, engine running.
• Record the vacuum.
Is the vacuum greater than 33.86 kPa (10 in-Hg)?
Yes | No |
|---|---|
GO to HN23 . | DIAGNOSE a loss of vacuum. REFER to the Workshop Manual Section 206-00, Brake System. Clear the PCM DTCs. REPEAT the self-test. |
HN23 CHECK TURBOCHARGER VACUUM WASTEGATE ACTUATOR OPERATION
• Disconnect the turbocharger wastegate control hose from the turbocharger wastegate actuator.
• Record each of the turbocharger wastegate actuator linkage positions.
• Using the DSL ENG Pressure Test Kit 014-00761 or equivalent, apply 33.86 kPa (10 in-hg) of vacuum to the turbocharger wastegate actuator.
Does each turbocharger wastegate actuator linkage move from the starting position and does the pressure remain steady?
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.