3800 Threw a code today
- Thread starter dole21
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DTC P0171
Circuit Description
The powertrain control module (PCM) 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 and Closed Loop. During Open Loop the PCM determines fuel delivery based on sensor signals, without oxygen sensor input. During Closed Loop the PCM adds oxygen sensor inputs to calculate short and long term fuel trim (fuel delivery adjustments). If the oxygen sensors indicate a lean condition, fuel trim values will be above 0 percent . If the oxygen sensors indicate a rich condition, fuel trim values will be below 0 percent. Short term fuel trim values change rapidly in response to the heated oxygen sensor (HO2S) voltage signals. Long term fuel trim makes coarse adjustments in order to maintain an Air/Fuel Ratio of 14.7:1. If the PCM detects an excessively lean condition, this diagnostic trouble code (DTC) will set.
******Conditions for Running the DTC
DTCs P0101, P0102, P0103, P0107, P0108, P0121, P0122, P0123 , P0130, P0131, P0132, P0133, P0134, P0135, P0137, P0138, P0140, P0141, P0201, P0202, P0203, P0204, P0205, P0206, P0300, P0401, P0403, P0404, P0405, P0410, P0440, P0442, P0446, P0506, P0507, P1404, or P1441 are not set.
- The engine coolant temperature (ECT) is between 20°C (68°F) and 110°C (230°F).
- The intake air temperature is between 18-70°C (64-158°F).
- The manifold absolute pressure (MAP) is between 15-105 kPa (2.1-15.2 psi).
- The vehicle speed is less than 132 km/h (82 mph).
- The engine speed is between 600-4,000 RPM.
- The barometric pressure is more than 70 kPa (10.1 psi).
- The mass airflow (MAF) is between 5-150 g/s.
- The fuel level is more than 10 percent.
*******Conditions for Setting the DTC
The average long term fuel trim value is above 20 percent.
All of the above conditions are present for 6 seconds.
Action Taken When the DTC Sets
The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.
*******Conditions for Clearing the MIL/DTC
The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
Clear the MIL and the DTC with a scan tool.
******Diagnostic Aids
The system will go lean if an injector is not suppling enough fuel.
A lean condition could be present during high fuel demand due to a fuel pump that does not pump enough fuel.
Using a scan tool, review the Failure Records. If an intermittent condition is suspected, refer to Intermittent Conditions .
Test Description
The numbers below refer to the step numbers on the diagnostic table.
If conditions were not corrected, refer to Fuel System Diagnostics for a possible fuel problem.
If conditions were not corrected, a worn cam, worn intake or exhaust valves, or other engine mechanical failures may be at fault.
Circuit Description
The powertrain control module (PCM) 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 and Closed Loop. During Open Loop the PCM determines fuel delivery based on sensor signals, without oxygen sensor input. During Closed Loop the PCM adds oxygen sensor inputs to calculate short and long term fuel trim (fuel delivery adjustments). If the oxygen sensors indicate a lean condition, fuel trim values will be above 0 percent . If the oxygen sensors indicate a rich condition, fuel trim values will be below 0 percent. Short term fuel trim values change rapidly in response to the heated oxygen sensor (HO2S) voltage signals. Long term fuel trim makes coarse adjustments in order to maintain an Air/Fuel Ratio of 14.7:1. If the PCM detects an excessively lean condition, this diagnostic trouble code (DTC) will set.
******Conditions for Running the DTC
DTCs P0101, P0102, P0103, P0107, P0108, P0121, P0122, P0123 , P0130, P0131, P0132, P0133, P0134, P0135, P0137, P0138, P0140, P0141, P0201, P0202, P0203, P0204, P0205, P0206, P0300, P0401, P0403, P0404, P0405, P0410, P0440, P0442, P0446, P0506, P0507, P1404, or P1441 are not set.
- The engine coolant temperature (ECT) is between 20°C (68°F) and 110°C (230°F).
- The intake air temperature is between 18-70°C (64-158°F).
- The manifold absolute pressure (MAP) is between 15-105 kPa (2.1-15.2 psi).
- The vehicle speed is less than 132 km/h (82 mph).
- The engine speed is between 600-4,000 RPM.
- The barometric pressure is more than 70 kPa (10.1 psi).
- The mass airflow (MAF) is between 5-150 g/s.
- The fuel level is more than 10 percent.
*******Conditions for Setting the DTC
The average long term fuel trim value is above 20 percent.
All of the above conditions are present for 6 seconds.
Action Taken When the DTC Sets
The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.
*******Conditions for Clearing the MIL/DTC
The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
Clear the MIL and the DTC with a scan tool.
******Diagnostic Aids
The system will go lean if an injector is not suppling enough fuel.
A lean condition could be present during high fuel demand due to a fuel pump that does not pump enough fuel.
Using a scan tool, review the Failure Records. If an intermittent condition is suspected, refer to Intermittent Conditions .
Test Description
The numbers below refer to the step numbers on the diagnostic table.
If conditions were not corrected, refer to Fuel System Diagnostics for a possible fuel problem.
If conditions were not corrected, a worn cam, worn intake or exhaust valves, or other engine mechanical failures may be at fault.
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imported_snoop
Guest
i would say yeah, change the sensor. if that dont work take it out and return it. do you have a-tap. check you IPW(injector pulse width) see where that is at, when was the last time you cleaned the injectors. look at those things, but if you have a-tap, look to see what the car is trying to tell you.
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