FUEL PUMP UNIT INSPECTION [L3 R.H.D.]

Fuel Pump Operation Inspection

1. Remove the fuel-filler cap.

Caution

• Fuel pump operation without fuel in the fuel tank may possible cause malfunction. Verify that there is sufficient fuel in the tank for pump suction.

2. Connect the WDS or equivalent to the DLC-2.

3. Operate the fuel pump using the simulation function FP.

4. Verify that there is operation sound from the fuel pump.

• If the operation sound cannot be verified, measure the voltage at the fuel pump unit wiring harness-side connector terminal C.

- If it is within the specification, inspect the following:

• Fuel pump continuity inspection

- If it is not within the specification, inspect the following:

• Fuel pump relay

• Wiring harnesses and connectors between main relay-fuel pump relay-fuel pump unit

Standard

B+ (Ignition switch at ON)

Continuity Inspection

1. Disconnect the negative battery cable.

2. Disconnect the fuel pump unit connector.

3. Inspect for continuity between fuel pump unit terminals C-D.

• If there is continuity, perform the Circuit Open/Short Inspection.

• If there is no continuity, replace the fuel pump unit.

Hold Pressure Inspection

Warning

• Fuel line spills and leakage from the pressurized fuel system are dangerous. Fuel can ignite and cause death or serious injuries and damage. To prevent this, always carry out the following procedure with the engine stopped.

1. Perform the 'Fuel Line Safety Procedure' referring to the BEFORE SERVICE PRECAUTION. (See BEFORE SERVICE PRECAUTION [L3].)

2. Disconnect the negative battery cable.

3. Disconnect the fuel tank side quick release connector of fuel filter (high-pressure). (See FUEL FILTER (HIGH-PRESSURE) REMOVAL/INSTALLATION [L3].)

4. Install the SST. Turn the lever of the SST to the 90× position to the hose to plug the outlet of the SST.

5. Insert the SST quick release connector into the fuel pipe until a click is heard.

6. Verify that the installation is secured by pulling the quick release connector.

7. Prevent fuel spillage by placing the fuel hose outlet (rubber hose) of the SST into a container.

8. Connect the negative battery cable.

Caution

• Fuel pump operation without fuel in the fuel tank may possible cause malfunction. Verify that there is sufficient fuel in the tank for pump suction.

9. Connect the WDS or equivalent to the DLC-2.

10. Measure the fuel pump discharge pressure for 10 s during fuel pump operation, using the FP simulation function.

• If it is not within the specification, inspect the following:

- Fuel pump

- Fuel line clogging or leakage

Standard

590-800 kPa {6.02-8.15 kgf/cm², 85.6-116 psi}

11. Stop the fuel pump operation and measure the fuel pressure after 5 min.

• If it is not within the specification, inspect the following:

- Fuel pump

- Fuel line clogging or leakage

Standard

330 kPa {3.37 kgf/cm², 47.9 psi} or more

12. Perform the 'Fuel Line Safety Procedure' referring to the BEFORE SERVICE PRECAUTION. (See BEFORE SERVICE PRECAUTION [L3].)

13. Disconnect the SST.

14. Connect the quick release connector. (See QUICK RELEASE CONNECTOR REMOVAL/INSTALLATION [L3].)

15. Inspect all parts by performing the AFTER SERVICE PRECAUTION. (See AFTER SERVICE PRECAUTION [L3].)