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EGR System
The exhaust gas recirculation system consists of the
exhaust gas recirculation valve with position response, the exhaust ducts and
and the electronic system management in the engine control unit.
The exhaust gas recirculation valve is directly actuated by
the Motronic M 2.8.1.
1 Exhaust gas recirculation valve
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Function:
A response potentiometer in the exhaust gas recirculation
valve uses the position of the valve needle to report the opening cross section
to the Motronic M 2.8.1, guaranteeing precise metering of the amount of
exhaust gas being returned.
In exhaust gas recirculation, a defined amount of exhaust gas
is returned to the combustion process to reduce the formation of nitrogen
oxides.
There is a more detailed description in section 12,
"Fuel System - Exhaust System".
· Service
If the exhaust gas recirculation valve, the lead between the
exhaust gas recirculation valve and the control unit or the response
potentiometer is defective, the engine telltale illuminates and a trouble code
is stored in the control unit.
The exhaust gas recirculation valve can be checked using
TECH 1 actuator diagnosis.
In case of a defect, the control unit continues operating
with replacement values to ensure that the vehicle can reach the nearest
authorized Opel/Vauxhall workshop.
