P2178 BUICK - Fuel Trim System Rich At Cruise Or Acceleration
When is the code detected?The Engine Control Module (ECM) has detected a rich air/fuel ratio
P2178 Buick DescriptionThe Engine Control Module (ECM) controls the air/fuel metering system in order to provide the best possible combination of driveability, fuel economy, and emission control. Fuel delivery is controlled differently during Open Loop and Closed Loop. During Open Loop, the ECM determines fuel delivery based on sensor signals without heated oxygen sensor (HO2S) input. During Closed Loop, the ECM adds HO2S inputs to calculate the short and long term fuel trim (FT) adjustments. If the HO2S indicates a lean condition, the fuel trim values will be above 0 percent. If the HO2S indicates a rich condition, the FT values will be below 0 percent. The short term FT values change rapidly in response to the HO2S voltage signals. The long term FT makes coarse adjustments in order to maintain an air/fuel ratio of 14.7:1.
Need more help?Do you need more help with the P2178 Buick code? Ask a question to our users or find an automotive repair shop near you to help fix the OBDII code
P2178 BUICK CommentsHelp us improve AutoCodes.com. Leave a comment below or tell us if the information above help you fix the code. What are the symptoms on your vehicle for the P2178 Buick code? Have you replaced any parts?
Any information is appreciated. Thanks