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On Board Diagnosis Logic NHEC0916 With the Air/Fuel Mixture Ratio Self-Learning Control, the actual Sensor Input Signal to ECM ECM func- tion Actuator Heated oxygen sensors 1 Density of oxygen in exhaust gas Fuel injec- Injectors DTC No. Trouble diagnosis name DTC Detecting Condition Possible Cause P0172 Fuel injection system Fuel injection system does not operate properly, I Heated oxygen sensor 1 I Injectors I Exhaust gas leaks I Incorrect fuel pressure I Mass air flow sensor SEF968Y DTC Confirmation Procedure NHEC0917 NOTE: WITH CONSULT-II NHEC0917S01 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. GI MA EM LC FE AT AX SU BR ST RS BT HA SC EL IDX DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION On Board Diagnosis Logic EC-281 |