On-Vehicle Inspection

1. Check Fuel Pump Operation




- Connect the Lexus hand-held tester to the DLC3.
- Turn the ignition switch ON and LEXUS hand-held tester main switch ON.
NOTICE: Do not start the engine.
- Select the active test mode on the LEXUS hand-held tester.

- Please refer to the LEXUS hand - held tester operator's manual for further details.
- If you have no LEXUS hand-held tester, connect the positive (+) and negative (-) leads from the battery to the fuel pump connector.




- Check that there is pressure in the fuel inlet hose.
HINT: If there is fuel pressure, you will hear the sound of fuel flowing.

If there is no pressure, check these parts:
- Fusible link
- Fuses
- EFI main relay
- Fuel pump
- Fuel pump relay
- Fuel pump resistor
- ECM
- Wiring connections

- Turn the ignition switch to LOCK.
- Disconnect the LEXUS hand-held tester from the DLC3.

2. Check Fuel Pressure
- Check the battery positive voltage is above 12.0 volts.
- Disconnect the negative (-) terminal cable from the battery.
- Remove the pulsation damper.
- See pulsation damper service procedures.




- Install the fuel inlet hose and SST (pressure gauge) to the delivery pipe with the 3 gaskets and the SST (union bolt). (SST 09268-45012)

Torque: 39 Nm (29 ft.lb)

- Wipe off any splattered gasoline.




- Connect the LEXUS hand-held tester to the DLC3.
- Reconnect the negative (-) terminal cable to the battery.
- Turn the ignition switch ON.
- Measure the fuel pressure.

Fuel pressure: 265 - 304 kPa (2.7 - 3.1 kgf/cm2, 38 - 44 psi)

- If pressure is high, replace the fuel pressure regulator.
- If pressure is low, check these parts:
- Fuel hoses and connections
- Fuel pump
- Fuel filter
- Fuel pressure regulator

- Remove the LEXUS hand-held tester from the DLC3.
- Start the engine.




- Disconnect the vacuum sensing hose from the fuel pressure regulator, and plug the hose end.
- Measure the fuel pressure at idle.

Fuel pressure: 265 - 304 kPa (2.7 - 3.1 kgf/cm2, 38 - 44 psi)

- Reconnect the vacuum sensing hose to the fuel pressure regulator.
- Measure the fuel pressure at idle.

Fuel pressure: 196 - 235 kPa (2.0 - 2.4 kgf/cm2, 28 - 34 psi)

- If pressure is not as specified, check the vacuum sensing hose and fuel pressure regulator.
- Stop the engine.
- Check that the fuel pressure remains as specified for 5 minutes after the engine has stopped.

Fuel pressure: 147 kPa (1.5 kgf/cm2, 21 psi) or more

If pressure is not as specified, check the fuel pump, pressure regulator and/or injectors.
- After checking fuel pressure, disconnect the negative (-) terminal cable from the battery and carefully remove the pressure gauge and union bolt to prevent gasoline from spraying.
- Reinstall the pulsation damper.
- Reconnect the negative (-) terminal cable to the battery.
- Check for fuel leakage.