General information
In order to reduce the emission of nitrogen oxides into the atmosphere, the engine design provides for the removal of part of the exhaust gases into the intake pipeline through the EGR valve. This admixture of exhaust gases to the air-fuel mixture leads to a decrease in its combustion temperature.
The system consists of an EGR valve, an EGR valve opening degree sensor, a control module (RSM) and a set of auxiliary information sensors. The PCM is programmed to provide the optimum EGR valve opening for any engine operating condition. A special information sensor constantly monitors the degree of opening of the EGR valve, issuing appropriate signals to the control module. The PCM compares the incoming information of the sensor with the optimal calculated value determined from the data coming from other information sensors and, if necessary, makes the required adjustment of the volume of exhaust gases entering the engine.
Examination
1. For check of serviceability of functioning of the gauge of degree of opening the EGR valve disconnect from the valve electroconducting and check up.
2. Now you should check the functioning of the EGR valve itself. Start the engine and warm it up to normal operating temperature. (cooling fan should turn on). Now turn off the engine and disconnect the wiring from the EGR valve.
3. With a jumper wire, connect the positive terminal of the battery to terminal No. 4 of the EGR riveter. Start the engine and connect the negative battery terminal to the No. 6 valve terminal. The stability of the engine speed should be broken, up to its complete stop, otherwise replace the EGR valve.
4. Further testing of the EGR system requires the use of special tools and diagnostic equipment.
Replacing EGR Valve Components
1. Disconnect the wiring from the EGR valve opening degree sensor.
2. Give two fixing nuts and remove the EGR valve.
3. Clean mating surfaces of valve and adapter.
4. Replace the gasket and install the EGR valve in its original location. Tighten the fixing nuts firmly.
5. Restore the original wiring connection.