Fuel Pressure: Testing and Inspection

1. CHECK FUEL PUMP OPERATION:
- Remove the fuse cover on the instrument panel.
- Connect the Toyota hand-held tester to the DLC3.
- Turn the ignition switch ON and Toyota hand-held tester main switch ON.
NOTICE: Do not start the engine.
- Select the active test mode on the Toyota hand-held tester.
- Please refer to the Toyota hand-held tester operator's manual for further details.
- If you have no Toyota 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 from the fuel filter.
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 (AM2 30A, IGN 7.5A).
- EFI main relay.
- Fuel pump.
- ECM.
- Wiring connections.

- Turn the ignition switch to LOCK.
- Disconnect the Toyota hand-held tester from the DLC3.
- Reinstall the fuse cover on the instrument panel.

2. CHECK FUEL PRESSURE.
- Check the battery positive voltage is above 12 volts.
- Disconnect the negative (-) terminal cable from the battery.
- Remove the union bolt and 2 gaskets, and disconnect the fuel inlet hose from the fuel filter outlet.

CAUTION:
- Put a shop towel under the fuel filter.
- Slowly loosen the union bolt.

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

Torque: 29 Nm (21 ft.lb)

- Wipe off any splattered gasoline.



- Connect the Toyota 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 (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.
- VSV for fuel pressure control.
- Disconnect the Toyota hand-held tester from the DLC3.
- Reinstall the fuse cover on the instrument panel.
- 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 (38 - 44 psi)

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

Fuel pressure: 226 - 265 kPa (33 - 38 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 (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 SST to prevent gasoline from splashing.
- Reconnect the fuel inlet hose with 2 new gaskets and the union bolt.

Torque: 29 Nm (21 ft.lb)

- Reconnect the negative (-) terminal cable to the battery.
- Check for fuel leakage.
- Refer to "Testing the Fuel System For Leaks" under System Diagnosis.