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P0172, P0175 FUEL INJECTION SYSTEM FUNCTION EC-241 < DTC/CIRCUIT DIAGNOSIS > [VQ35HR] C D E F G H I J K L M A EC N P O 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 Check fuel pressure. Refer to . Is the inspection result normal? YES >> GO TO 5. NO >> Replace “fuel filter and fuel pump assembly”. 5. 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-571, "Mass Air Flow Sensor" With GST 1. Install all removed parts. 2. Check mass air flow sensor signal in “Service $01” with GST. EC-571, "Mass Air Flow Sensor" Is the measurement value within the specification? YES >> GO TO 6. NO >> Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or grounds. Refer to 6. 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. 2. Listen to each fuel injector operating sound. Is the inspection result normal? YES >> GO TO 7. NO >> Perform trouble diagnosis for FUEL INJECTOR, refer to . 7. CHECK FUEL INJECTOR 1. Remove fuel injector assembly. Refer to EM-40, "Removal and Installation" . Keep fuel hose and all fuel injectors connected to fuel tube. 2. Confirm that the engine is cooled down and there are no fire hazards near the vehicle. 3. Disconnect all fuel injector harness connectors. DTC A/F sensor 1 ECM Ground Continuity Bank Connector Terminal Connector Terminal P0172 1 F3 1 F102 57 Ground Not existed 2 61 P0175 2 F20 1 65 2 66 Clicking sound should be heard. PBIB3332E |