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EC-850 < COMPONENT DIAGNOSIS > [MR18DE] P0172 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. 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 FUELINJECTOR 1. Remove fuel injector assembly. Refer to EM-162, "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. 4. Disconnect all ignition coil harness connectors. 5. Prepare pans or saucers under each fuel injectors. Clicking noise should be heard. PBIB3332E |