PINPOINT TEST HG: Positive Crankcase Ventilation (PCV) System: Introduction

WARNING: This page does not describe the selected car, but rather 31 other vehicles, including the 2008 Mercury Sable, 2008 Mercury Mountaineer, 2008 Mercury Milan, 2008 Mercury Mariner, and 2008 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.

This pinpoint test is intended to diagnose the following:

positive crankcase ventilation (PCV) valve (6A666) and related vacuum lines
electrically heated PCV valve (6A666) and heater circuit, both PCM and non-PCM controlled
electrically heated PCV tube (9F624) and heater circuit, both PCM and non-PCM controlled
powertrain control module (PCM) (12A650)
PCV thermal extension harness (12A580)

NOTE: For the electrically heated PCV system only, refer to POSITIVE CRANKCASE VENTILATION (PCV) SYSTEM .

Electrically Heated PCV

Fig 1: Positive Crankcase Ventilation Heated Fitting (PCVHF) Connector

Courtesy of FORD MOTOR CO.

Fig 2: Positive Crankcase Ventilation (PCV) Connector - B

Courtesy of FORD MOTOR CO.

Fig 3: Positive Crankcase Ventilation (PCV) Connector - C

Courtesy of FORD MOTOR CO.

Vehicle	Connector	Pin	Circuit
Crown Victoria (PCM controlled PCV heater), E-Series 6.8L (PCM controlled PCV heater), E-Series 4.6L (PCM controlled PCV heater), Explorer 4.0L (PCM controlled PCV heater), Explorer Sport Trac 4.0L (PCM controlled PCV heater), F-150 4.2L (PCM controlled PCV heater), F-150 4.6L (PCM controlled PCV heater), Fusion 3.0L (PCM controlled PCV heater), Grand Marquis (PCM controlled PCV heater), Milan 3.0L (PCM controlled PCV heater), Mountaineer 4.0L (PCM controlled PCV heater), Mustang 4.0L (PCM controlled PCV heater), Mustang 5.4L (PCM controlled PCV heater), Town Car (PCM controlled PCV heater)	A	1 2	PCVHC IGN START/RUN
Expedition (Non-PCM controlled heated PCV tube), F-150 5.4L (Non-PCM controlled heated PCV tube), Mark LT (Non-PCM controlled heated PCV tube), Navigator (Non-PCM controlled heated PCV tube)	B	2 1	GND IGN START/RUN
F-Super Duty 5.4L (PCM controlled heated PCV tube)	C	2 1	PCVHC IGN START/RUN
All other vehicles	A	1 2	GND IGN START/RUN

Fig 4: Positive Crankcase Ventilation Heated Fitting (PCVHF) Connector

Courtesy of FORD MOTOR CO.

Pin	Circuit
1	PCVHF (Positive Crankcase Ventilation Heated Fitting)
2	IGN START/RUN

Fig 5: Positive Crankcase Ventilation Thermal Extension -Harness Side (PCVTE-Harness Side)

Courtesy of FORD MOTOR CO.

Pin	Circuit
2	GND (Ground)
1	IGN START/RUN

This table is only for vehicles equipped with a PCM controlled PCV heater.

Vehicle	Connector	Pin	Circuit
E-Series, F-Super Duty	170 Pin	E2	PCVHC
F-150	190 Pin	E3	PCVHC
Fusion, Milan	140 Pin	E2	PCVHC
Mustang 5.4L	170 Pin	E67	PCVHC
All other vehicles	170 Pin	E3	PCVHC