p-taurus » 07 янв 2016, 16:54
17 Feedback System Malfunction
General Description
In order to provide the best possible combination of drivability, fuel economy and emission control, the ECM uses a closed loop air/fuel metering system. The ECM monitors the HO2S signal voltage and adjusts fuel delivery based it in closed loop fuel control. Changes in fuel delivery will be indicated by the long-term and the short-term fuel trim values. The ideal fuel trim value is around 0%. The ECM will add fuel when the HO2S signal is indicating a lean condition. Additional fuel is indicated by fuel trim values that are above 0%. The ECM will reduce fuel when the HO2S signal is indicating a rich condition. Reduction in fuel is indicated by fuel trim values that are below 0%. The DTC relevant to fuel trim will be set when the amount reaches excessive levels because of a lean or rich condition.
DTC Description
If the lambda controller reaches the maximum or minimum threshold, then feedback control is no longer possible and emissions will be increased. The ECM sets DTC 17 if no proportional fuel adaptation occurs for a defined time after the lambda controller has reached its minimum or maximum threshold.
Possible Cause
● Air leakage or restriction in intake or exhaust system
● Dirty engine oil or oil level too high
● HO2S or MAFS contamination
● Fuel system
● EVAP system
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