1 - Pneumatic valve of the exhaust gas recirculation system;
2 - Solenoid valve of the exhaust gas recirculation system (open/closed);
3 - Vacuum pump;
4 - Engine;
5 - Exhaust manifold;
6 - Intake manifold;
7 - Air filter;
8 - Injection computer;
9 - Coolant temperature sensor.
To remove EGR solenoid valve 2, first remove the air filter.
To remove EGR valve 1, remove the air filter. Replace the gasket between the solenoid valve and the manifold each time you remove it.
Note. To remove the steel pipe connecting the air valve of the exhaust gas recirculation system with the air filter, you must first remove the air valve.
The EGR system is controlled by a computer using a cyclic solenoid valve.
The following parameters are decisive for opening the EGR solenoid valve:
- air temperature;
- coolant temperature;
- height above sea level,
- load lever position;
- vehicle speed;
- engine crankshaft speed.
The exhaust gas recirculation system is disabled if:
- air temperature < 16°C or
- coolant temperature < 45°C
or
- engine speed/load potentiometer signal exceeds thresholds.
The EGR system is deactivated after 40 seconds of engine idling.
The exhaust gas recirculation system is switched on again as soon as the vehicle speed is > 40 km/h. The system is deactivated again after 40 seconds of engine idling and when the vehicle is stopped.