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HIGH PRESSURE FUEL PUMP ECM-381 < DTC/CIRCUIT DIAGNOSIS > [MR20DD] C D E F G H I J K L M A ECM N P O YES >> GO TO 8. NO >> GO TO 2. 2. CHECK HIGH PRESSURE FUEL PUMP POWER SUPPLY CIRCUIT 1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Disconnect high pressure fuel pump relay harness connector. 4. Check the continuity between ECM harness connector and high pressure fuel pump relay harness con- 5. Also check harness for short to power. Is the inspection result normal? YES >> GO TO 3. NO >> Repair or replace malfunctioning part. 3. CHECK HIGH PRESSURE FUEL PUMP RELAY POWER SUPPLY (CONTACT SIDE) Check the voltage between high pressure fuel pump relay harness connector and ground. Is the inspection result normal? YES >> GO TO 4. NO >> Perform the trouble diagnosis for power supply circuit. 4. CHECK HIGH PRESSURE FUEL PUMP RELAY POWER SUPPLY (EXCITATION COIL SIDE) 1. Install all removed parts. 2. Turn ignition switch ON. 3. Check the voltage between high pressure fuel pump relay harness connector and ground. Is the inspection result normal? YES >> GO TO 6. NO >> GO TO 5. 5. CHECK HIGH PRESSURE FUEL PUMP RELAY POWER SUPPLY CIRCUIT (EXCITATION COIL SIDE) 1. Turn ignition switch OFF. 2. Disconnect high pressure fuel pump relay harness connector. 3. Disconnect IPDM E/R harness connector. 4. Check the continuity between IPDM E/R harness connector and high pressure fuel pump relay harness + − Continuity ECM High pressure fuel pump relay Connector Terminal Connector Terminal F16 50 F161 5 Existed + − Voltage High pressure fuel pump relay Connector Terminal F161 3 Ground Battery voltage + − Voltage High pressure fuel pump relay Connector Terminal F161 1 Ground Battery voltage |