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LOW PRESSURE FUEL PUMP ECM-377 < DTC/CIRCUIT DIAGNOSIS > [MR20DD] C D E F G H I J K L M A ECM N P O LOW PRESSURE FUEL PUMP Component Function Check INFOID:0000000010703063 1. CHECK LOW PRESSURE FUEL PUMP FUNCTION 1. Turn ignition switch ON. 2. Pinch fuel feed hose with two fingers. Is the inspection result normal? YES >> INSPECTION END NO >> Proceed to ECM-377, "Diagnosis Procedure" . Diagnosis Procedure INFOID:0000000010703064 1. CHECK FUEL PUMP RELAY POWER SUPPLY 1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Turn ignition switch ON. 4. Check the voltage between ECM harness connector terminals. Is the inspection result normal? YES >> GO TO 3. NO >> GO TO 2. 2. CHECK FUEL PUMP RELAY POWER SUPPLY CIRCUIT 1. Turn ignition switch OFF. 2. Disconnect IPDM E/R harness connector. 3. Check the continuity between ECM harness connector and IPDM E/R harness connector. 4. Also check harness for short to power. Is the inspection result normal? YES >> Perform trouble diagnosis for power supply circuit. NO >> Repair or replace malfunctioning part. 3. CHECK FUEL PUMP POWER SUPPLY 1. Turn ignition switch OFF. 2. Reconnect ECM harness connector. 3. Disconnect “fuel level sensor unit and fuel pump” harness connector. 4. Turn ignition switch ON. 5. Check the voltage between “fuel level sensor unit and fuel pump” harness connector and ground. Fuel pressure pulsation should be felt on the fuel JSBIA0601ZZ + − Voltage ECM Connector Terminal Connector Terminal F16 87 E57 128 Battery voltage + − Continuity ECM IPDM E/R Connector Terminal Connector Terminal F16 87 F90 106 Existed |