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EC-1202 [YD (WITH EURO-OBD)] DTC P1274 FUEL PUMP Diagnostic Procedure EBS013GK 1. CHECK ECM OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 1. Turn ignition switch OFF. 2. Disconnect ECM harness connector and fuel pump harness 3. Check harness continuity between ECM terminal 10 and fuel 4. Also check harness for short to ground and short to power. OK or NG OK >> GO TO 2. NG >> Repair open circuit or short to ground or short to power in harness or connectors. 2. CHECK FUEL PUMP GROUND CIRCUIT FOR OPEN AND SHORT 1. Check harness continuity between ECM terminal 29 and fuel pump terminal 2. 2. Also check harness for short to ground and short to power. OK or NG OK >> GO TO 3. NG >> Repair open circuit or short to ground or short to power in harness or connectors. 3. CHECK FUEL RAIL PRESSURE SENSOR Refer to EC-1063, "Component Inspection" . OK or NG OK >> GO TO 4. NG >> Replace fuel rail. 4. CHECK FUEL PUMP Refer to EC-1203, "Component Inspection" . OK or NG OK >> GO TO 6. NG >> GO TO 5. 5. REPLACE FUEL PUMP 1. Replace fuel pump. 2. Perform Fuel Pump Learning Valve Clearing. Refer to EC-956, "Fuel Pump Learning Value Clearing" . >> INSPECTION END 6. CHECK INTERMITTENT INCIDENT Refer to EC-1002, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" . >> INSPECTION END Continuity should exist. PBIB1943E Continuity should exist. |