Fuel Pump Delivery Rate, Checking

Fuel Pump Delivery Rate, Checking

Special tools, testers and auxiliary items required

• Hand held remote control (jumper).

• Multimeter.

• Electrical connector test lead set.

• Fuel pressure test set.

• Measuring container, fuel-resistant.

Test conditions

• Battery voltage 12.5 V

• Fuel filter OK

• Fuel tank at least 1/4 filled.

• Fuel pressure regulator OK.

• Ignition switched OFF.

Test procedure

- Perform a preliminary check to verify the customers complaint. Refer to => [ Preliminary Check ] Preliminary Check

Start diagnosis

- Remove the fuel filler cap from fuel filler tube.

- Remove rear seat bench. Refer to the Repair Information.

- Remove the floor sealing cover.

- Disconnect the electrical harness connector from the fuel delivery unit.

- Connect a hand held remote control (jumper) to terminal 1 of the fuel delivery unit and to vehicle battery (+).

- Connect a jumper wire from terminal 5 of the fuel delivery unit to vehicle Ground.


Fuel system is under pressure! Before opening the system, place rags around the connection area. Then release the pressure by carefully loosening the connection.

- Disconnect the fuel return line by pressing release buttons.

- Connect a fuel line from the fuel pressure test set to the disconnected fuel return line and hold it in the measuring container.

- Press the switch on the hand held remote control (jumper) and operate the fuel pump for 15 seconds.

- Compare quantity of fuel delivered with minimum delivery rate in the diagram (cm3/30s).

• Voltage at the fuel pump with engine stopped and fuel pump running is approx. 2 volts less than battery voltage.

If minimum delivery quantity is not obtained, the following malfunctions may be present:

If specified value was Not obtained:

Check the following components;

• Fuel lines pinched.

• Fuel filter restriction.

• Fuel pump faulty.

- Repair or replace the above components as necessary.

- To replace the fuel filter refer to the Repair Information.

- To replace the fuel pump refer to the Repair Information.

Assembly is performed in reverse order of removal. Note the following:

- Install the rear seat bench. Refer to the Repair Information.

Final procedures

After the repair work, the following work steps must be performed in the following sequence:

1. Check the DTC memory. Refer to => [ Diagnostic Mode 03 - Read DTC Memory ] Diagnostic Modes 01 - 09.

2. If necessary, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Modes 01 - 09.

3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.