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EC-222 < COMPONENT DIAGNOSIS > [VQ35HR] P0171, P0174 FUEL INJECTION SYSTEM FUNCTION 5. Check the continuity between A/F sensor 1 harness connector or ECM harness connector and ground. 6. Also check harness for short to power. Is the inspection result normal? YES >> GO TO 4. NO >> Repair open circuit or short to ground or short to power in harness or connectors. 4. CHECK FUEL PRESSURE 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”. NO >> Repair or replace malfunctioning part. 6. CHECK MASS AIR FLOW SENSOR With CONSULT-III 1. Install all removed parts. 2. Check “MASS AIR FLOW” in “DATA MONITOR” mode with CONSULT-III. EC-543, "Mass Air Flow Sensor" With GST 1. Install all removed parts. 2. Check mass air flow sensor signal in Service $01 with GST. EC-543, "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 grounds. Refer to 7. CHECK FUNCTION OF FUEL INJECTOR With CONSULT-III 1. Start engine. 2. Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT-III. 3. Check that each circuit produces a momentary engine speed drop. Without CONSULT-III 1. Start engine and let it idle. DTC A/F sensor 1 ECM Ground Continuity Bank Connector Terminal Connector Terminal P0171 1 F3 1 F102 57 Ground Not existed 2 61 P0174 2 F20 1 65 2 66 |