Engine Emission Control: Other Ford Focus II

Vehicle Emission Control Information (VECI) Decal

The VECI decal is located on the upper radiator support and shows

1. components of the emission control system.
2. the correct vacuum hose routing.
3. the color stripe of the vacuum hoses.

Positive Crankcase Ventilation (PCV) System

The PCV system uses intake manifold vacuum to ventilate blow-by fumes from the crankcase and return the fumes to the intake manifold for combustion. The PCV valve varies the amount of blow-by gases returned to the intake manifold based on available engine vacuum. The PCV valve also prevents the entry of combustion backfiring into the crankcase.

Exhaust Gas Recirculation (EGR) System

The EGR system returns a small amount of exhaust gas into the intake manifold. This reduces the overall combustion temperature. Cooler combustion temperatures provide a significant reduction of the oxides of nitrogen (NOx) in the exhaust emissions.

The engine incorporates a stepper motor-controlled EGR valve which receives its signal from the PCM. Engine coolant is used to cool the EGR valve. The EGR valve and stepper motor are serviced as an assembly.

The amount of recirculated exhaust gas depends upon

1. engine rpm.
2. intake manifold vacuum.
3. exhaust backpressure.
4. engine coolant temperature.
5. throttle position.

Secondary Air Injection (AIR) System

The AIR system controls emissions during engine operation by forcing air downstream into the exhaust manifold to oxidize the hydrocarbons and carbon monoxide.

Refer to the INTRODUCTION - GASOLINE .

Exhaust Gas Recirculation (EGR) Valve

MATERIAL SPECIFICATIONS

Scheme 20

Scheme 21

Scheme 22

1. Drain the cooling system. For additional information, refer to «ENGINE COOLING»(ref-255386) .
2. Remove the battery tray. For additional information, refer to «BATTERY MOUNTING AND CABLES»(ref-255404) .
3. Loosen the clamps, disconnect the vent tube and remove the air cleaner outlet pipe. To install, tighten to 4 Nm (35 lb-in).
4. Disconnect the exhaust gas recirculation (EGR) valve electrical connector.
5. If equipped, disconnect and position the secondary air injection (AIR) valve inlet hose aside.
6. Disconnect the EGR valve coolant hose.
7. Remove the 2 bolts and the EGR valve. To install, tighten to 20 Nm (15 lb-ft).
8. To install, reverse the removal procedure.
9. Fill and bleed the cooling system. For additional information, refer to «ENGINE COOLING»(ref-255386) .

Scheme 23

1. For additional information, refer to the appropriate procedure in this article.

Crankcase Vent Oil Separator

MATERIAL SPECIFICATIONS