Control valve, exhaust gas recirculation
| Control valve, exhaust gas recirculation |
The task of the control valve is to convert electronic instructions from the EDC 15 control module into negative pressure that affects the diaphragm in the EGR valve. The negative pressure is taken from the engine vacuum pump, which always generates a pre-determined negative pressure.
The control valve pin 2 is connected to the control module pin 97 and pin 1 is connected to the main relay pin 87.
The control valve is grounded through control module pin 97 with a 140 Hz PWM pulse. The timing ratio determines the magnitude of the negative pressure in the hose to the EGR valve, by which means the position of the EGR valve can be controlled.
| Diagnostics |
If the control module output is short-circuited to B+, diagnostic trouble code P0401 will be generated.
If the control module output is short-circuited to ground, diagnostic trouble code P0400 will be generated.
If the EGR magnitude is too large in comparison with the desired magnitude, diagnostic trouble code P0402 will be generated.
If the EGR magnitude is too small in comparison with the desired magnitude, diagnostic trouble code P0403 will be generated.
System reaction to a fault
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Reduced power.
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The control functions for exhaust gas recirculation, swirl throttle and charge air are turned off.
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