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EC-234 < DTC/CIRCUIT DIAGNOSIS > [VK56DE] P0172, P0175 FUEL INJECTION SYSTEM FUNCTION OK or NG OK >> GO TO 4. NG >> Repair open circuit or 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 and check fuel pressure. Refer to OK or NG OK >> GO TO 6. NG >> GO TO 5. 5. DETECT MALFUNCTIONING PART Check the following. • Fuel pump and circuit (Refer to .) • <Flexible Fuel Vehicle> .) • Fuel pressure regulator (Refer to >> 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 >> GO TO 7. NG >> 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. Make sure that each circuit produces a momentary engine speed drop. Without CONSULT-III 1. Start engine. At idling: Approximately 350 kPa (3.57 kg/cm 2 , 51 psi) 3.0 - 9.0 g·m/sec: at idling 9.0 - 28.0 g·m/sec: at 2,500 rpm 3.0 - 9.0 g·m/sec: at idling 9.0 - 28.0 g·m/sec: at 2,500 rpm |