Electrical
connector
connector
Mounting bolts
Exhaust gas passage
Pintle
The exhaust gas recirculation (EGR) system is used to lower oxides of nitrogen (NOx)
emission levels caused by high combustion temperature. It does this by decreasing
combustion temperature.
The main element of the system is the EGR valve. The EGR valve feeds small amounts
of exhaust gas back into the combustion chamber. With the fuel/air mixture thus
diluted, combustion temperatures are reduced.
If a problem with the EGR system will not allow the PCM to control pintle position
properly, DTC P0404 should set. The PCM also tests for EGR flow. If incorrect flow is
detected, DTC P0401 should set. If DTC P0401 and/or DTC P0404 are encountered.
emission levels caused by high combustion temperature. It does this by decreasing
combustion temperature.
The main element of the system is the EGR valve. The EGR valve feeds small amounts
of exhaust gas back into the combustion chamber. With the fuel/air mixture thus
diluted, combustion temperatures are reduced.
If a problem with the EGR system will not allow the PCM to control pintle position
properly, DTC P0404 should set. The PCM also tests for EGR flow. If incorrect flow is
detected, DTC P0401 should set. If DTC P0401 and/or DTC P0404 are encountered.
Exhaust Gas Recirculation Valve (EGR)
