Fuel Delivery and Air Induction: Testing and Inspection

1. CHECK FUEL PUMP OPERATION
(a) Connect the LEXUS hand-held tester to the DLC3.
(b) Turn the ignition switch ON and LEXUS hand-held tester main switch ON.

NOTICE: Do not start the engine.

(c) Select the active test mode on the LEXUS hand-held tester.





(d) Please refer to the LEXUS hand-held tester operator's manual for further details.

(e) If you have no LEXUS hand-held tester, connect the positive (+) and negative (-) leads from the battery to the fuel pump connector.


(f) 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
(g) Turn the ignition switch to LOCK.
(h) Disconnect the LEXUS hand-held tester from the DLC3.

2. CHECK FUEL PRESSURE
- Check the battery positive voltage is above 12 V.
- Disconnect the negative (-) terminal cable from the battery.
- Remove the pulsation damper (See pulsation damper removal).





- 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 N.m (400 kgf.cm, 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 SST to prevent gasoline from splashing. SST 09268-45012
- Reinstall the pulsation damper
- Reconnect the negative (-) terminal cable to the battery.
- Check for fuel leakage.