EG2 - Emission System Malfunction Detection By Quick Test

^ Perform the Quick Test to detect emission system(s) malfunctioning. QT4 Perform Diagnostic Test Mode (Extracting Codes)

NOTE: Faults in the catalyst and exhaust system due to exhaust leaks or melted catalyst are not detectable by the Quick Test.

^ Are diagnostic trouble codes present?

YES -- PERFORM the Pinpoint Test(s) listed on the Diagnostic Trouble Code Chart within Quick Test 6 (QT6). QT6 Diagnostic Trouble Code Chart

If the Pinpoint Test(s) check OK, PERFORM Test Steps EG3 through EG7 prior to powertrain control component replacement. EG3 - Check Exhaust Gas Recirculation (EGR) System Function

NO -- GO to Test EX1. (Three way catalytic converter possibly melted or contaminated, or the exhaust system is restricted.) EX1 - Vacuum Test