Cold start emission reduction strategy monitoring: Notes

The diagnosis of the cold start emission reduction strategy is not one specific diagnosis but a network of several individual component diagnostics and engine functions.

During cold start the key cold start control parameters

engine idle speed

retarded ignition angle

are monitored or limited such, that a malfunction will be detected if the vehicle's emissions exceed 150% of the applicable FTP standard. The retarded ignition angle limitation is calibrated for 100% of the applicable FTP standard.