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P0171 FUEL INJECTION SYSTEM FUNCTION EC-243 < DTC/CIRCUIT DIAGNOSIS > [HR16DE] C D E F G H I J K L M A EC N P O 6. Also check harness for short to power. YES >> GO TO 4. NO >> Repair open circuit or short to ground or short to power in harness or connectors. 4. CHECK FUEL PRESSURE 1. Release fuel pressure to zero. Refer to . 2. Install fuel pressure gauge and check fuel pressure. Refer to . Is the inspection result normal? YES >> GO TO 6. NO >> GO TO 5. 5. CHECK FUEL HOSES AND FUEL TUBES Check fuel hoses and fuel tubes for clogging. YES >> Replace “fuel filter and fuel pump assembly”. Refer to . NO >> Repair or replace 6. CHECK MASS AIR FLOW SENSOR With CONSULT 1. Install all removed parts. 2. Check “MASS AIRFLOW” in “DATA MONITOR” mode with CONSULT. With GST 1. Install all removed parts. 2. Check mass air flow sensor signal in Service $01 with GST. Is the measurement value within the specification? YES >> GO TO 7. NO >> Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or grounds. Refer to . 7. CHECK FUNCTION OF FUEL INJECTOR With CONSULT 1. Start engine. 2. Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT. 3. Make sure that each circuit produces a momentary engine speed drop. A/F sensor 1 Ground Continuity Connector Terminal F12 1 Ground Not existed 2 ECM Ground Continuity Connector Terminal F11 49 Ground Not existed 53 At idling: Approximately 350 kPa (3.57 kg/cm 2 , 51 psi) 0.8 - 4.0 g/s : at idling 2.0 - 10.0 g/s : at 2,500 rpm 0.8 - 4.0 g/s : at idling 2.0 - 10.0 g/s : at 2,500 rpm |