Published: 11-May-2011
2007.0 Range Rover Sport (LS), 303-08D
Engine Emission Control - TDV8 3.6L Diesel (G938532)
| Item | Description |
|---|---|
| 1 | exhaust gas recirculation (EGR) intake pipe |
| 2 | EGR coolant outlaet pipe |
| 3 | EGR gas outlet pipe |
| 4 | EGR valve |
| 5 | EGR gas outlet pipe |
| 6 | EGR valve |
| 7 | EGR cooler |
| 8 | EGR intake pipe |
The EGR system comprises:
- EGR modulator x 2
- EGR cooler x 2
- Associated connecting pipes
The combined EGR modulator and cooler is located between the V of the cylinder banks. The cooler side of the EGR is connected to the vehicle cooling system, via hoses. The inlet exhaust side is connected to the exhaust manifolds on each side via a metal pipe. The exhaust gas passes through the cooler and is expelled via the actuator and a metal pipe into the throttle housing. The EGR modulator is a solenoid operated valve which is controlled by the engine control module (ECM). The ECM uses the EGR modulator to control the amount of exhaust gas being recirculated in order to reduce exhaust emissions and combustion noise. The EGR is enabled when the engine is at normal operating temperature and under cruising conditions.
| Item | Description |
|---|---|
| 1 | EGR cooler |
| 2 | EGR gas intake |
| 3 | EGR cooler coolant outlet |
| 4 | EGR coolant thermostat |
| 5 | EGR coolant inlet |
| 6 | EGR gas outlet |
| 7 | EGR valve |
The EGR modulator receives a 12V supply from the main relay. The ground for the solenoid is via the ECM and is controlled using a pulse width modulation (PWM) signal. The PWM duty signal of the solenoid ground is varied to determine the precise amount of exhaust gas delivered to the cylinders.
The modulators are operated through their full range at each engine start-up, to clear any carbon deposits that may have built up whilst the engine was running.
In the event of a failure of the EGR modulator, the EGR function will become inoperative. The ECM can monitor the EGR modulator solenoid for short circuits and store fault codes in the event of failure. The modulator can also be activated for testing using the Land Rover recommended diagnostic tool.
Each EGR cooler has a thermostat located in the coolant outlet. This alows for more accurate control of the coolant temperature and the exhaust gas.
| Item | Description |
|---|---|
| 1 | Crankcase ventilation oil seperator |
| 2 | Crankcase ventilation gas breather to air intake pipe |
| 3 | Air intake pipe |
| 4 | Crankcase ventilation oil return drain pipe |
The crankcase ventilation system on the engine ensures that all gasses emitted from the crankcase during engine running are separated from any oil particles.
Crankcase gasses are drawn internally into the oil separator unit located in the engine V. The oil separator removes oil from the crankcase gasses. The seperated gas is returned to the inlet side of the air induction system prior to the right-hand (RH) turbo charger. The oil is drained from the separator to the oil pan via an oil return pipe located at the rear of the cylinder block.