Item name | Spare part number | Description |
1 | - | EGR modulator/cooler assembly |
2 | - | Electronic throttle |
3 | - | EGR thermostat (from model year 2007) |
4 | - | Pipe connecting EGR to electronic throttle |
5 | - | EGR cooler |
6 | - | EGR modulator valve |
7 | - | EGR modulator solenoid valve |
8 | - | EGR coolant hoses |
EGR system
The EGR system includes:
- EGR modulator x 2
- EGR cooler x 2
- Corresponding connecting pipes
Cooler and EGR modulator
Item name | Spare part number | Description |
1 | - | EGR modulator |
2 | - | EGR cooler |
3 | - | EGR thermostat (from model year 2007) |
Electric Throttle Body
Item name | Spare part number | Description |
1 | - | Intake air temperature sensor |
2 | - | Electric Throttle Body |
3 | - | throttle valve |
4 | - | Throttle actuator motor |
5 | - | Gas inlet port |
The EGR modulator and cooler are combined into one unit.
A combined EGR cooler and modulator for each bank of cylinders is located between the exhaust manifold and the cylinder head. The EGR system on the cooler side is connected by hoses to the vehicle's cooling system. The inlet of the module is connected directly to its outlet manifold. The exhaust gases pass through the cooler and then through the actuator and metal piping into the throttle body. The EGR modulator is a solenoid valve that is controlled by the ECM. The ECM uses the EGR modulator to control the amount of exhaust gases that are recirculated to reduce exhaust emissions and combustion noise. EGR is activated at normal engine operating temperature and driving at a constant speed.
On vehicles from model year 2007, a flow-control solid-fill thermostat is installed in the coolant outlet of the EGR cooler. The thermostat is designed to speed up engine warm-up, improve the performance of the interior heater and reduce the amount of toxic constituents in the exhaust gases in order to meet the requirements of the EU4 standard. The thermostat is closed when cold, starts to open at 75°C and is fully open at normal operating temperature. The thermostat has a small drain hole that drains a small amount of coolant when cold.
The EGR modulator is powered by 12V from the main relay. The solenoid ground is implemented by the ECM and switched by a PWM signal. The solenoid valve's PWM ground signal is changed to set the exact amount of exhaust gas supplied to the cylinders.
EGR modulators go through a full duty cycle every time the engine is started to clean up soot and carbon deposits.
In the event of a malfunction of the EGR modulator, the EGR function becomes inoperative. The ECM can monitor the EGR modulator solenoid valve for a short circuit and generate DTCs in the event of a malfunction. For testing, the modulator can also be activated using the diagnostic system recommended by Land Rover.
Crankcase ventilation
Item name | Spare part number | Description |
1 | - | breather tube |
2 | - | Oil separator |
3 | - | breather tube |
4 | - | Oil drain pipe to the sump |
5 | - | |
6 | - | Oil drain valve |
7 | - | Circulation of crankcase gases |
The crankcase ventilation system of the TDV6 engine ensures the separation of oil from crankcase gases released during engine operation.
The crankcase gases enter the oil separator from the crankcase and from under the valve covers of both rows of cylinders. The oil separator separates oil from crankcase gases. The gases are directed back into the intake tract at a point before the compressor. The oil drains into the sump through a drain valve located at the rear of the cylinder block.
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