Perform Emission System Malfunction Detection By Quick Test

^ Perform the EEC Quick Test to detect emission system(s) malfunctioning.

NOTE: Faults in the Catalysts and Exhaust System due to exhaust leaks or melted catalysts are not detectable by the EEC Quick Test.

^ Are diagnostic trouble codes present?

YES -- Perform the Pinpoint Test(s) for trouble codes present. See Computer and Control Systems / Testing and Inspection / Procedures / Diagnostic Trouble Code (DTC) Description.

If the Pinpoint Test(s) check OK, Go to Check EGR System Function. Check EGR System Function

NO -- Three way catalytic converter possibly melted or contaminated, or the exhaust system is restricted. Go to Perform Vacuum Test. Perform Vacuum Test