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EC9-260 < DTC/CIRCUIT DIAGNOSIS > [R9M] P0627 FUEL PUMP P0627 FUEL PUMP DTC Logic INFOID:0000000010309220 DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1. PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at >> GO TO 2. 2. PERFORM DTC CONFIRMATION PROCEDURE 1. Start the engine and wait at least 5 seconds. 2. Check DTC. Is DTC detected? YES >> Proceed to EC9-260, "Diagnosis Procedure" . NO >> INSPECTION END Diagnosis Procedure INFOID:0000000010309221 1. CHECK FUEL LEAKAGE Visually check the fuel leakage. Is the inspection result normal? YES >> GO TO 2. NO >> Repair or replace error-detected parts. 2. CHECK FUEL PRESSURE SENSOR POWER SUPPLY 1. Disconnect fuel pressure sensor harness connector. 2. Turn ignition switch ON. 3. Check the voltage between fuel pressure sensor harness connector and ground. Is the inspection result normal? YES >> GO TO 4. NO >> GO TO 3. 3. CHECK FUEL PRESSURE SENSOR POWER SUPPLY CIRCUIT DTC No. CONSULT screen terms (Trouble diagnosis content) DTC detecting condition Possible cause P0627 LOW PRES PMP REL CIRC VIA THE CONTROL UNIT • 2.DEF: SIGNAL OUTSIDE LOWER LIMIT • 3.DEF: PARAMETER AT MINIMUM STOP • 4.DEF: PARAMETER AT MAXIMUM STOP • Low fuel pressure is excessively low. • Harness or connectors (Fuel pump relay circuit is open or • Fuel pump relay + − Voltage (Approx.) Fuel pressure sensor Connector Terminal F124 3 Ground 5 V |