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Diagnostic Trouble Code: B0083
Diagnostic Trouble Code Name: Front End Sensor 1
Vehicle Make: Pontiac
Vehicle Model: G8 (VE)
Diagnostic Code Entered By: ZerOne
Diagnostic Code Entered On: Wed Oct 06, 2010 11:00 pm
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Please Note: The DTC Information provided has been randomly generated.
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Diagnostic Trouble Code Description:
Fuel Trim System Lean Bank 2
Possible Sensor Faults
ECM
Possible Related Diagnostic Trouble Codes
DTC P0171, P0172, P0174, or P0175 for the 2.8L, 3.0L, 3.2L, or 3.6L engine
Circuit / System Description
The 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 (CL). During Open Loop, the ECM determines fuel delivery based on sensor signals without heated oxygen sensor (HO2S) input. During CL, the ECM adds HO2S inputs and level of purge 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?%. If the HO2S indicates a rich condition, the FT values will be below 0?%. 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 optimum air/fuel ratio. A block of cells contain information arranged in combinations of engine RPM and engine load for a full range of vehicle operating conditions. The long term FT diagnostic is based on an average of cells currently being used. The ECM selects the cells based on the engine speed and load. The FT diagnostic will conduct a test to determine if a rich failure actually exists or if excessive vapor from the evaporative emission (EVAP) canister is causing a rich condition.
If the ECM detects an excessively lean condition, DTC?P0171 or P0174 sets. If the ECM detects an excessively rich condition, DTC?P0172 or P0175 sets.
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