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DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION EC-281 < SERVICE INFORMATION > [VQ35DE] C D E F G H I J K L M A EC N P O OK or NG OK >> GO TO 6. NG >> GO TO 5. 5. DETECT MALFUNCTIONING PART Check the following. .) • Fuel pressure regulator (Refer to ) • Fuel lines (Refer to .) • Fuel filter for clogging >> Repair or replace. 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. With GST 1. Install all removed parts. 2. Check mass air flow sensor signal in Service $01 with GST. OK or NG OK (With CONSULT-III)>>GO TO 7. >> 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-III 1. Start engine. 2. Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT-III. 3. Make sure that each circuit produces a momentary engine speed drop. OK or NG OK >> GO TO 10. NG >> Perform trouble diagnosis for FUEL INJECTOR, refer to 8. CHECK FUNCTION OF FUEL INJECTOR-I Without CONSULT-III 1. Turn ignition switch OFF. At idling: Approximately 350 kPa (3.57 kg/cm 2 , 51 psi) 2.0 - 6.0 g·m/sec: at idling 7.0 - 20.0 g·m/sec: at 2,500 rpm 2.0 - 6.0 g·m/sec: at idling 7.0 - 20.0 g·m/sec: at 2,500 rpm |