Diagnosing Adaptive Fuel DTCS: Description

Adaptive fuel DTCs diagnostic techniques help isolate root causes of adaptive fuel concerns. Before proceeding, road test vehicle to verify if any driveability concerns are present. These diagnostic aids are meant as a supplement to system test steps under SYSTEM TESTS . For a description of fuel trim, see FUEL TRIM under POWERTRAIN CONTROL MODULE SOFTWARE under COMPUTERIZED ENGINE CONTROLS in THEORY & OPERATION - CNG, FLEX-FUEL & GASOLINE article.