Range Rover Evoque: Engine Emission Control - GTDi 2.0L Petrol

Emission Control - Component Location

COMPONENT LOCATION

1. Intake manifold
2. Bolt (8 off)
3. Crankcase ventilation hose
4. Oil separator
5. Gasket
6. Camshaft cover
7. Lower clean air inlet duct
8. Upper clean air inlet duct
9. Camshaft cover vent hose
10. Air cleaner housing

Engine Emission Control - Overview

OVERVIEW

The engine emission control system reduces the level of hydrocarbon emissions released to atmosphere from the engine.

The engine emission control system consists of an oil separator and PCV (positive crankcase ventilation) valve located on the engine cylinder block and a cam cover breather.

Engine Emission Control - System Operation and Component Description

System Operation

OPERATION

Oil Separator

Piston blow-by gases are drawn through the oil separator into the engine air intake manifold and added to the air charge.

The depression caused by the engine air intake draws gasses from the crankcase, through the separator and the hose into the air inlet manifold.

The resultant depression in the engine oil pan, front covers and cylinder head covers reduces the load on the joint seals in those areas. Engine oil drawn into the separator is collected on angled plates in the separator. The oil collects on the plates and falls back to the oil pan via a hole in the cylinder block.

Camshaft Cover Breather

Piston blow-by gases that enter the camshaft cover are drawn through the baffle valve and into the clean air low pressure intake duct by a venturi effect of the clean air passing the hose connection. Oil vapor is collected in the baffle valve and drains back to the cylinder head and the oil pan.

Component Description

COMPONENT DESCRIPTION

Oil Separator

The oil separator is located on the LH (left-hand) side of the cylinder block. It is secured with 8 bolts and sealed with a gasket. A hose connects from the top of the separator and is routed into the intake manifold. The hose connection to the separator contains a PCV (positive crankcase ventilation) valve. The PCV valve is open at low throttle opening and closed and mid to full throttle openings.

Camshaft Cover Breather

The camshaft cover breather comprises a hose connecting the camshaft cover to the clean air low pressure intake duct from the air cleaner and a baffle valve located within the cover. This breather is known as the full load breather.

Engine Emission Control

Principles of Operation

For a detailed description of the engine emissions systems, refer to the relevant Description and Operation section in the workshop manual. REFER to: (303-08B Engine Emission Control - GTDi 2.0L Petrol)

Inspection and Verification

CAUTION: Diagnosis by substitution from a donor vehicle is NOT acceptable. Substitution of control modules does not guarantee confirmation of a fault, and may also cause additional faults in the vehicle being tested and/or the donor vehicle.

1. Verify the customer concern.

2. Visually inspect for obvious signs of damage.

Visual Inspection

• Engine breather hoses
• PCV (positive crankcase ventilation) valve
• Engine oil level

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. If the cause is not visually evident, verify the symptom and refer to the Symptom Chart.

Symptom Chart

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