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On Board Diagnosis Logic NHEC0912 With the Air/Fuel Mixture Ratio Self-Learning Control, the actual Sensor Input Signal to ECM ECM func- tion Actuator Heated oxygen sensor 1 Density of oxygen in exhaust gas Fuel injec- Injector DTC No. Trouble diagnosis name DTC Detecting Condition Possible Cause P0171 Fuel injection system Fuel injection system does not operate properly, I Intake air leaks I Heated oxygen sensor 1 I Injector I Exhaust gas leaks I Incorrect fuel pressure I Lack of fuel I Mass air flow sensor I Incorrect PCV hose connection SEF968Y DTC Confirmation Procedure NHEC0913 NOTE: WITH CONSULT-II NHEC0913S01 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-LEARN CONTROL” 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 sys- 8) Crank engine while depressing accelerator pedal. If engine GI MA EM LC FE AT AX SU BR ST RS BT HA SC EL IDX DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION On Board Diagnosis Logic EC-273 |