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DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION EC-321 C D E F G H I J K L M A EC DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION PFP:16600 On Board Diagnosis Logic NBS000QX With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the DTC Confirmation Procedure NBS000QY CAUTION: Always drive vehicle at a safe speed. NOTE: WITH CONSULT-II 1. Start engine and warm it up to normal operating temperature. 2. Turn ignition switch OFF and wait at least 10 seconds. 3. Turn ignition switch ON and select “SELF-LEARNING CONT” in “WORK SUPPORT” mode with CON- 4. Clear the self-learning control coefficient by touching “CLEAR”. 5. Select “DATA MONITOR” mode with CONSULT-II. 6. Start engine again and let it idle for at least 10 minutes. NOTE: a. Turn ignition switch OFF and wait at least 10 seconds. b. Start engine and drive the vehicle under the similar conditions to The similar conditions to (1st trip) Freeze Frame Data means the vehicle operation that the following con- Sensor Input signal to ECM ECM function Actuator Air fuel ratio (A/F) sensor 1 Density of oxygen in exhaust gas Fuel injection control Fuel injector DTC No. Trouble diagnosis name DTC detecting condition Possible cause P0171 Fuel injection system too ● Fuel injection system does not operate properly. ● The amount of mixture ratio compensation is too ● Intake air leaks ● Air fuel ratio (A/F) sensor 1 ● Fuel injector ● Exhaust gas leaks ● Incorrect fuel pressure ● Lack of fuel ● Mass air flow sensor ● Incorrect PCV hose connection P0174 SEF968Y Engine speed Engine speed in the freeze frame data ± 400 rpm Vehicle speed Vehicle speed in the freeze frame data ± 10 km/h (6 MPH) |