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Home >> Mercury >> 2008 >> Milan Base, 2.3 Z, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Automatic Transaxle/Transmission - AISIN Aw21) >> Diagnostic Tests >> Visual Inspection >> Carry Out On-Board Diagnostics Key ON Engine OFF (KOEO), Key ON Engine Running (KOER)

Carry Out On-Board Diagnostics Key ON Engine OFF (KOEO), Key ON Engine Running (KOER)

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After a road test, with the vehicle warm and before disconnecting any connectors, carry out the Self Test using the scan tool. Refer to the Introduction - Gasoline Engines article for diagnosis and testing of the powertrain control system.