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DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION EC-1427 [VG33ER] 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 UBS00DVZ With the Air-Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the DTC Confirmation Procedure UBS00DW0 NOTE: WITH CONSULT-II 1. Start engine and warm it up to normal operating temperature. 2. Turn ignition switch OFF and wait at least 5 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. 7. If it is difficult to start engine at step 6, the fuel injection system 8. Crank engine while depressing accelerator pedal. If engine EC-1431, "Diagnostic Procedure" not start, check exhaust and intake air leak visually. WITH GST 1. Start engine and warm it up to normal operating temperature. 2. Turn ignition switch OFF and wait at least 5 seconds. 3. Disconnect mass air flow sensor harness connector. Then restart and run engine for at least 5 seconds at 4. Stop engine and reconnect mass air flow sensor harness connector. 5. Select MODE 3 with GST. Make sure DTC P0102 is detected. 6. Select MODE 4 with GST and erase the DTC P0102. 7. Start engine again and let it idle for at least 10 minutes. Sensor Input signal to ECM ECM function Actuator Heated oxygen sensors 1 Density of oxygen in exhaust gas Fuel injection Fuel injectors DTC No. Trouble diagnosis name DTC detecting condition Possible cause P0171 Fuel injection system ● Fuel injection system does not operate properly. ● The amount of mixture ratio compensation is too ● Intake air leaks ● Heated oxygen sensor 1 ● Fuel injector ● Exhaust gas leaks ● Incorrect fuel pressure ● Lack of fuel ● Mass air flow sensor ● Incorrect PCV hose connection P0174 SEF968Y |