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EC-846 < COMPONENT DIAGNOSIS > [MR18DE] P0171 FUEL INJECTION SYSTEM FUNCTION 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 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-1038, "Mass Air Flow Sensor" With GST 1. Install all removed parts. 2. Check mass air flow sensor signal in Service $01 with GST. EC-1038, "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. Make sure that each circuit produces a momentary engine speed drop. Without CONSULT-III 1. Let engine idle. 2. Listen to each fuel injector operating sound. Is the inspection result normal? YES >> GO TO 8. NO >> Perform trouble diagnosis for FUEL INJECTOR, refer to EC-975, "Component Function Check" . 8. CHECK FUEL INJECTOR HO2S1 ECM Ground Continuity Connector Terminal Connector Terminal F12 4 F11 49 Ground Not existed Clicking noise should be heard. PBIB3332E |