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EC-242 < DTC/CIRCUIT DIAGNOSIS > [VQ35DE] P0171, P0174 FUEL INJECTION SYSTEM FUNCTION 5. Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector 6. Also check harness for short to power. Is the inspection result normal? YES >> GO TO 4. NO >> Repair open circuit, 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 kit [SST (J-44321)] and check fuel pressure. Refer to Is the inspection result normal? YES >> GO TO 6. NO >> GO TO 5. 5. DETECT MALFUNCTIONING PART Check fuel hoses and fuel tubes for clogging. Is the inspection result normal? YES >> Replace “fuel filter and fuel pump assembly”. Refer to . NO >> Repair or replace malfunctioning part. 6. CHECK MASS AIR FLOW SENSOR With CONSULT 1. Install all removed parts. 2. Check “MASS AIR FLOW” in “DATA MONITOR” mode with CONSULT. EC-536, "Mass Air Flow Sensor" With GST 1. Install all removed parts. 2. Check mass air flow sensor signal in Service $01 with GST. EC-536, "Mass Air Flow Sensor" 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 ground. Refer to 7. CHECK FUNCTION OF FUEL INJECTOR With CONSULT 1. Start engine. DTC A/F sensor 1 Ground Continuity Bank Connector Terminal P0171 1 F27 1 Ground Not existed 2 P0174 2 F64 1 2 DTC ECM Ground Continuity Connector Terminal P0171 F8 45 Ground Not existed 49 P0174 53 57 At idling: Approximately 350 kPa (3.57 kg/cm 2 , 51 psi) |