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 Engine Control Module (ECM) monitors the position of the EGR valve pintle via the EGR position sensor. If the ECM detects a calibrated variance between the desired EGR valve pintle position and actual position for a calibrated amount of time, a DTC will set.
Removal & Installation
- Disconnect the negative battery cable.
- Disconnect the EGR valve electrical connector.
- Remove the EGR valve retaining bolts.
- Remove the EGR valve assembly.
- Install the EGR valve assembly and tighten the retaining bolts to 22 ft. lbs. (30 Nm).
- Connect the EGR valve electrical connector.
- Connect the negative battery cable.