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4 CHECK FUEL PRESSURE 1. Release fuel pressure to zero. Refer to EC-SR-31. 2. Install fuel pressure gauge and check fuel pressure. At idling: When fuel pressure regulator valve vacuum hose is connected. 235 kPa (2.35 bar, 2.4 kg/cm 2 , 34 psi) When fuel pressure regulator valve vacuum hose is disconnected. 294 kPa (2.94 bar, 3.0 kg/cm 2 , 43 psi) OK or NG OK © GO TO 6. NG © GO TO 5. 5 DETECT MALFUNCTIONING PART Check the following. I Fuel pump and circuit Refer to EC-SR-316. I Fuel pressure regulator Refer to EC-SR-32. I Fuel lines Refer to “ENGINE MAINTENANCE” in MA section. I Fuel filter for clogging © Repair or replace. 6 CHECK MASS AIR FLOW SENSOR With CONSULT-II Check “MASS AIR FLOW” in “DATA MONITOR” mode with CONSULT-II. at idling: 2.5 - 5.0 g ⋅ m/sec at 2,500 rpm: 7.1 - 12.5 g ⋅ m/sec With GST Check mass air flow sensor signal in MODE 1 with GST. at idling: 2.5 - 5.0 g ⋅ m/sec at 2,500 rpm: 7.1 - 12.5 g ⋅ m/sec OK or NG OK © GO TO 7. NG © Check connectors for rusted terminals or loose connections in the mass air flow sensor DTC P0171 FUEL INJECTION SYSTEM FUNCTION (LEAN SIDE) SR20DE Diagnostic Procedure (Cont’d) EC-215 |