HG: Positive Crankcase Ventilation (PCV) — 2016 workshop reference 5161

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.

• Visually inspect for a damaged or pinched PCV hose o-ring seal.

• Visually inspect for a correctly installed dipstick or damaged dipstick o-ring seal.

• Check for a correctly installed oil cap.

• Check for air leaks between the throttle body and intake valves.

• Visually inspect the intake throttle plate for sticking or binding.

• Verify the correct PCV valve part number.

Is a concern present?

Yes	No
REPAIR as necessary. Clear the PCM DTCs. REPEAT the self-test.	For DTCs P04DB, P051B, P051C or P051D, GO to HG5 . For all others, GO to HG12 .

Yes

REPAIR as necessary.

Clear the PCM DTCs. REPEAT the self-test.

For DTCs P04DB, P051B, P051C or P051D, GO to HG5 .

For all others, GO to HG12 .

HG5 MONITOR THE CRANKCASE PRESSURE SENSOR PID

• Ignition ON, engine OFF.

• Access the PCM and monitor the CRNKCAS_P_V (VOLT) PID.

Is the voltage between 0.5 - 4.5 V?

Yes	No
For DTC P051B, GO to HG10 . For all others, GO to HG6 .	GO to HG6 .

Yes

For DTC P051B, GO to HG10 .

For all others, GO to HG6 .

GO to HG6 .

HG6 CHECK FOR VREF AT THE SENSOR

• Crankcase Pressure Sensor connector disconnected.

• Ignition ON, engine OFF.

• Measure the voltage between:

( + ) Crankcase Pressure Sensor Connector, Harness Side	( - ) Crankcase Pressure Sensor Connector, Harness Side
VREF - Pin 3	SIGRTN - Pin 2

( + ) Crankcase Pressure Sensor Connector,

Harness Side

( - ) Crankcase Pressure Sensor Connector,

Harness Side

VREF - Pin 3

SIGRTN - Pin 2

Is the voltage between 4.5 - 5.5 V?

Yes	No
GO to HG7 .	GO to Pinpoint Test C .

HG7 CHECK FOR AN OPEN

• Ignition OFF.

• PCM connector disconnected.

• Measure the resistance between:

Source reference 5161

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.