Fuel System Monitor

OBD System Description - Fuel System Monitor

System Description / Monitoring Procedure
As fuel system components age or otherwise change over the life of the vehicle, the adaptive fuel strategy learns deviations from stoichiometry while running in closed loop fuel. These learned corrections are stored in keep alive memory as long term fuel trim corrections. They may be stored continue to change beyond normal limits or if a malfunction occurs, the long term fuel trim values will reach a calibratable rich or lean limit where the adaptive fuel strategy is no longer allowed to compensate for additional fuel system changes. Long term fuel trim corrections at their limits, in conjunction with a calibratable deviation in short term fuel trim, the ECM will set DTC.

DTC Description / Detecting Condition / Confirmation Procedure
P2177 / P2178 / P2179 / P2180 / P2187 / P2188 / P2189 / P2190
Refer to DTC P2177 / P2178 / P2179 / P2180 / P2187 / P2188 / P2189 / P2190 P2177
P2096 / P2097 / P2098 / P2099
Refer to DTC P2096 / P2097 / P2098 / P2099 P2096

Fuel System Monitor (at Driving)

Operation






Enable Conditions






Typical malfunction thresholds






Fuel System Monitor (at Idling)

Operation









Enable Conditions






Typical malfunction thresholds






Post Catalyst Fuel System Monitor

Operation






Enable Conditions






Typical malfunction thresholds