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*: Preparation to carry out troubleshooting
Store the freeze frame data of diagnosis code P0171.
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Q.
Is any other diagnosis code than P0171 set?
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Inspection chart for diagnosis code (Refer to ).
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- Data list reference table (Refer to
).
- Item 5: Intake air temperature sensor
- Item 6: Engine coolant temperature sensor
- Item 8: Manifold absolute pressure sensor
- Item 10: Air flow sensor
- Item BB: Barometric pressure sensor
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Q.
Are the check results normal?
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Perform the diagnosis code classified check procedure for the sensor that has shown an abnormal data value. Inspection chart for diagnosis code (Refer to ).
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Q.
Is the check result normal?
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Q.
Is the check result normal?
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Q.
Is the check result normal?
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Q.
Is the check result normal?
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Repair the connector(s) or wiring harness.
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- Check valve operation check (Refer to GROUP 35A - Basic Brake System - On-Vehicle Service
).
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Q.
Is the check result normal?
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- Check purge control solenoid valve itself (Refer to GROUP 17 - Emission Control System - Evaporative Emission Control System - Purge Control Solenoid Valve Check
).
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Q.
Is the check result normal?
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Replace the purge control solenoid valve.
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- Measure fuel pressure (Refer to Fuel Pressure Test
).
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Q.
Is the check result normal?
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Repair the fuel pressure.
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Q.
Is the check result normal?
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Repair the connector(s) or wiring harness.
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Q.
Is the check result normal?
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Repair the connector(s) or wiring harness.
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- No. 1 injector connector.
- No. 2 injector connector.
- No. 3 injector connector.
- No. 4 injector connector.
- Injector check (Refer to
).
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Q.
Is the check result normal?
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Repair or replace the connector or replace the injector.
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- Check whether foreign materials enter into fuel such as water, diesel fuel, water removers and additives.
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Q.
Is the check result normal?
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- Refer to Data List Reference Table
.
- Item No. AC: Oxygen sensor (front)
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Q.
Is the check result normal?
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Replace the front oxygen sensor.
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- If diagnosis code P0171 is set while the vehicle is idling, let the vehicle idle for more than 20 minutes.
- If diagnosis code P0171 is set while the vehicle is running, let the vehicle run with the same conditions of the freeze frame data, such as the vehicle speed, the crank angle sensor and the coolant temperature sensor, for more than 10 minutes.
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Q.
Is diagnosis code P0171 set?
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After replacing the oxygen sensor (front), go to Step 16.
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Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
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- If diagnosis code P0171 is set while the vehicle is idling, let the vehicle idle for more than 20 minutes.
- If diagnosis code P0171 is set while the vehicle is running, let the vehicle run with the same conditions of the freeze frame data, such as the vehicle speed, the crank angle sensor and the coolant temperature sensor, for more than 10 minutes.
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Q.
Is diagnosis code P0171 set?
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