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 manifold through the EGR valve. Such mixing of exhaust gases into 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 (PCM) and a set of auxiliary information sensors. The PCM is programmed to provide the optimum EGR valve opening degree for any engine operating conditions. A special information sensor constantly monitors the EGR valve opening degree, sending appropriate signals to the control module. The PCM compares the incoming sensor information with the optimum calculated value determined based on data received from other information sensors and, if necessary, makes the required adjustment of the exhaust gas volume entering the engine.
Examination
1. To check the proper functioning of the EGR valve opening degree sensor, disconnect the electrical wiring from the valve and check for presence.
2. Now you should check the operation of the EGR valve itself. Start the engine and warm it up to normal operating temperature. (The cooling fan should turn on). Now turn off the engine and disconnect the wiring from the EGR valve.
3. Connect the positive battery terminal to terminal #4 of the EGR rivet with a jumper wire. Start the engine and connect the negative battery terminal to terminal #6 of the valve. The engine speed should become unstable, until it stops completely, 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. Loosen the two mounting nuts and remove the EGR valve.
3. Clean the mating surfaces of the valve and its adapter.
4. Replace the sealing gasket and install the EGR valve in its original place. Tighten the mounting nuts securely.
5. Restore the original electrical wiring connection.
(The original can be found on the resource: hondabook.ru)