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P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR EC-305 < COMPONENT DIAGNOSIS > [VQ37VHR] C D E F G H I J K L M A EC N P O 1. Turn ignition switch OFF. 2. Check ground connection M95. Refer to Ground Inspection in Is the inspection result normal? YES >> GO TO 2. NO >> Repair or replace ground connection. 2. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR FOR WATER 1. Disconnect EVAP control system pressure sensor harness connector. 2. Check sensor harness connector for water. Is the inspection result normal? YES >> GO TO 3. NO >> Repair or replace harness connector. 3. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY CIRCUIT 1. Turn ignition switch ON. 2. Check the voltage between EVAP control system pressure sensor harness connector and ground. Is the inspection result normal? YES >> GO TO 8. NO >> GO TO 4. 4. CHECK SENSOR POWER SUPPLY CIRCUIT Check harness for short to power and short to ground, between the following terminals. Is the inspection result normal? YES >> GO TO 5. NO >> Repair short to ground or short to power in harness or connectors. 5. CHECK COMPONENTS Check the following. EC-267, "Component Inspection" • Brake booster pressure sensor (Refer to EC-352, "Component Inspection" • Refrigerant pressure sensor (Refer to Is the inspection result normal? YES >> GO TO 6. NO >> Replace malfunctioning component. 6. CHECK APP SENSOR EC-460, "Component Inspection" Is the inspection result normal? YES >> GO TO 9. Water should not exist. EVAP control system pressure sensor Ground Voltage Connector Terminal B30 3 Ground Approx. 5V ECM Sensor Connector Terminal Name Connector Terminal F101 45 Brake booster pressure sensor E48 1 46 CKP sensor (POS) F2 1 M107 103 APP sensor E112 6 107 EVAP control system pressure sensor B30 3 111 Refrigerant pressure sensor E77 3 |