Exhaust Gas Recirculation (EGR) Monitoring

Exhaust Gas Recirculation (EGR) Monitoring

Description
The EGR system is only fitted to the naturally aspirated engine.

EGR Valve Range or Performance Failure
The EGR valve is checked by forcing it open and closed during a fuel cut. A reading from the manifold absolute pressure sensor is checked before, during and after the valve operation. The difference in the values between the open and closed state of the valve is compared with a map of engine speed versus the difference value. If this calculated value is below the threshold, then a fault is present.








If the above table does not include details of the following enabling conditions: - IAT, ECT, vehicle speed range, and time after engine start-up then the state of these parameters has no influence upon the execution of the monitor.