Ford Galaxy / Ford S-MAX. Manual - part 437
PCV valve diaphragm
PCV valve bush
PCV valve spring
Valve cover
The PCV system is made up of an oil separator chamber connected to the crankcase and
valve cover by hoses.
The crankcase pressure is controlled by a diaphragm operated PCV valve built into the valve
cover. As the pressure in the oil separator reduces, the diaphragm valve closes against the
force of the PCV valve spring, so closing the PCV valve. As the crankcase pressure rises, the
PCV valve is pushed open assisted by the PCV valve spring. This allows the positive
crankcase gasses to be scavenged by the air intake system.
Inspection and Verification
1. 1. Verify the customer concern.
2. 2. Visually inspect for obvious signs of mechanical or electrical damage.
Visual Inspection Chart
3. 3. If an obvious cause for an observed or reported concern is found, correct the cause
(if possible) before proceeding to the next step
4. 4. If the cause is not visually evident, verify the symptom and refer to the diagnostic
trouble code (DTC) chart.
Diagnostic Trouble Code (DTC) Index Chart
1. 1. If no DTC's are retrieved, verify the symptom and refer to the symptom chart.
Symptom Chart
Pinpoint Tests
2
3
4
5
Mechanical
Electrical
Exhaust gas recirculation (EGR) valve
EGR cooler
Gasket
PCV hoses
PCV oil separator
Electrical connector
Wiring harness
DTC
Description/Condition
Possible Source
Action
P1402 EGR metering orifice restricted EGR valve stuck closed or leaking GO to Pinpoint Test
A.
Symptom
Possible Sources
Action
Excessive exhaust
black smoke
EGR valve.
*
GO to Pinpoint Test
A.
*
Excessive crankcase
pressure
Blocked or damaged PCV
hose(s).
Blocked PCV oil separator.
*
*
GO to Pinpoint Test
B.
*
Worn or damaged engine
components.
*
REFER to: Engine (303-01C,
Diagnosis and Testing).
*
PINPOINT TEST A : EXCESSIVE EXHAUST BLACK SMOKE
TEST
CONDITIONS
DETAILS/RESULTS/ACTIONS
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