The Exhaust Gas Recirculation (EGR) system is used to reduce the amount of nitrogen oxide (NOx) emission levels caused by combustion temperatures exceeding 816°C (1,500°F). It does this by introducing small amounts of exhaust gas back into the combustion chamber. The exhaust gas absorbs a portion of the thermal energy produced by the combustion process and thus decreases combustion temperature.
The exhaust gas recirculation (EGR) valve is controlled by a high side driver within the powertrain control module (PCM). This high side driver uses a 12-volt pulse width modulated (PWM) signal. The ground path for the EGR valve is completed by turning in a separate driver within the PCM.
Removal & Installation
- Remove the air cleaner inlet duct
- Disconnect the EGR valve electrical connector.
- Loosen and reposition the transmission dipstick and tube.
- Remove the exhaust gas recirculation (EGR) pipe.
- Remove the EGR valve bolts.
- Remove the EGR valve.
- Remove the EGR valve gasket.
- Clean the EGR valve mating surface.
- Install the EGR valve with a new gasket to the intake manifold.
- Install the EGR valve bolts.
- Tighten the bolts to 22 ft. lbs. (30 Nm).
- Install the EGR pipe.
- Reposition and install the transmission fill tube and dipstick.
- Connect the EGR valve electrical connector.
- Install the air cleaner inlet duct.