LR3/Disco 3
EGR Cooler and Modulator
Electric Throttle Body
The EGR modulator and cooler are a combined unit.
The combined EGR modulator and cooler is located under each cylinder bank, between the exhaust manifold and the
cylinder head. The cooler side of the EGR is connected to the vehicle cooling system, via hoses. The inlet exhaust side is
connected directly into the exhaust manifolds on each side. 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 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
Item Part Number Description
1
-
EGR modulator
2
-
EGR cooler
Item Part Number
Description
1
-
Inlet air temperature sensor
2
-
Electric throttle body
3
-
Electric throttle flap
4
-
Electric throttle control motor
5
-
Gas inlet port
