High Pressure Fuel Pump

HIGH PRESSURE FUEL PUMP

Component Function Check


1. CHECK HIGH PRESSURE FUEL PUMP FUNCTION

With CONSULT
1.Start engine.
2.Check "FUEL PRES SEN V" in "DATA MONITOR" mode of "ENGINE" using CONSULT.





Without CONSULT
1.Start engine.
2.Check the voltage between ECM harness connector terminals as per the following conditions.





Is the inspection result normal?
YES- INSPECTION END
NO- Proceed to .


Diagnosis Procedure


1. CHECK HIGH PRESSURE FUEL PUMP POWER SUPPLY

1.Turn ignition switch ON.
2.Check the voltage between ECM harness connector and ground.





Is inspection result normal?
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 fuel injector relay harness connector.
4.Check the continuity between ECM harness connector and high pressure fuel pump relay harness connector.





5.Also check harness for short to ground.
Is the inspection result normal?
YES- GO TO 3.
NO- Repair or replace error-detected parts

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.Reconnect all harness connectors disconnected.
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 harness connector.





5.Also check harness for short to ground.
Is the inspection result normal?
YES- Perform the trouble diagnosis for power supply circuit.
NO- Repair or replace error-detected parts.

6. CHECK HIGH PRESSURE FUEL PUMP RELAY GROUND CIRCUIT

1.Turn ignition switch OFF.
2.Disconnect high pressure fuel pump relay harness connector.
3.Check the continuity between high pressure fuel pump relay harness connector and ground.





4.Also check harness for short to power.
Is the inspection result normal?
YES- GO TO 7.
NO- Repair or replace error-detected parts.

7. CHECK HIGH PRESSURE FUEL PUMP RELAY

Check the high pressure fuel pump relay. .
Is inspection result normal?
YES- GO TO 8.
NO- Replace high pressure fuel pump relay. Standardized Relay.

8. CHECK HIGH PRESSURE FUEL PUMP CIRCUIT

1.Turn ignition switch OFF.
2.Disconnect ECM harness connector and high pressure fuel pump harness connector.
3.Check the continuity between ECM harness connector and high pressure fuel pump harness connector.





4.Also check harness for short to ground and to power.
Is inspection result normal?
YES- GO TO 9.
NO- Repair or replace error-detected parts.

9. CHECK HIGH PRESSURE FUEL PUMP

Check the high pressure fuel pump. .
Is inspection result normal?
YES- GO TO 10.
NO- Replace high pressure fuel pump. Exploded View.

10. CHECK HIGH PRESSURE FUEL PUMP INSTALLATION CONDITION

1.Turn ignition switch OFF.
2.Check that the high pressure fuel pump is installed with no backlash and looseness.
Is the inspection result normal?
YES- GO TO 11.
NO- Repair or replace error-detected parts.

11. CHECK CAMSHAFT

1.Remove camshaft. Exploded View.
2.Check camshaft. Inspection.
Is inspection result normal?
YES- Check intermittent incident. Intermittent Incident.
NO- Replace camshaft. Exploded View.


Component Inspection (High Pressure Fuel Pump)


1. CHECK HIGH PRESSURE FUEL PUMP-I

1.Turn ignition switch OFF.
2.Disconnect high pressure fuel pump harness connector.
3.Check the resistance between high pressure fuel pump terminals as follows.





Is the inspection result normal?
YES- GO TO 2.
NO- Replace high pressure fuel pump. Exploded View.

2. CHECK HIGH PRESSURE FUEL PUMP-II

With CONSULT
1.Reconnect high pressure fuel pump harness connector.
2.Start the engine.
3.Check "FUEL PRES SEN" in "DATA MONITOR" of "ENGINE" using CONSULT.





Without CONSULT
1.Start the engine.
2.Check fuel rail pressure sensor signal voltage.





Is the inspection result normal?
YES- INSPECTION END
NO- Replace high pressure fuel pump. Exploded View.


Component Inspection (High Pressure Fuel Pump Relay)


1. CHECK HIGH PRESSURE FUEL PUMP RELAY

1.Turn ignition switch OFF.
2.Remove high pressure fuel pump relay.





3.Check the continuity between high pressure fuel pump relay terminals as per the following conditions.





Is the inspection result normal?
YES- INSPECTION END
NO- Replace high pressure fuel pump relay.