EGR System
The EGR system consists of the following:
- EGR system module which incorporates the following components in one unit:
- EGR valve
- EGR system module transducer
- EGR vacuum regulator solenoid
- Exhaust manifold-to-EGR system module tube
NOTE:
Only the 4.0L SOHC engine is equipped with an EGR system. The 4.6L (3V) engine uses a variable camshaft timing system.
The EGR system returns a portion of the exhaust gas to the intake manifold to reduce the combustion temperature. This results in lower Nitrogen Oxides (NOX) formation.
The PCM controls the EGR system module. When the EGR system module valve opens, exhaust gas flows to the intake manifold.
The EGR valve controls the amount of exhaust gas flowing into the intake manifold.
The EGR system module transducer:
- monitors the EGR system module flow rate through the EGR valve.
- sends an EGR system module flow rate signal to the PCM.
The EGR vacuum regulator solenoid uses input from the PCM to change the EGR system module operation.
The exhaust manifold-to-EGR system module tube:
- connects the exhaust manifold to the EGR valve.