Fuel System

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.

NOTE: 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. (See step 3).





f. Check that the fuel pressure pulsation damper screw rises up when the fuel pump operates.
If there is no pressure, check these parts:
- Fusible link
- Fuses
- EFI main relay
- Fuel pump ECU
- Fuel pump
- ECM
- Wiring connections

g. Turn the ignition switch OFF.
h. Disconnect the LEXUS hand-held tester from the DLC3.

2. CHECK FUEL PRESSURE
a. Check the battery positive voltage is above 12 V.
b. Disconnect the negative (-) terminal cable from the battery.





c. Remove the union bolt and 2 gaskets, disconnect the fuel inlet hose from the fuel pipe support.

NOTE:
- Put a shop towel under the fuel pipe support.
- Slowly loosen the union bolt.





d. Install the fuel inlet hose and SST (pressure gauge) to the fuel pipe support with the 3 gaskets and SST (union adapter).
SST 09268-45014 (09268-41190, 90405-06167)

Torque: 29 N.m (300 kgf.cm, 21 ft.lbf)

e. Wipe off any splattered gasoline.





f. Connect the LEXUS hand-held tester to the DLC3. (See step 1. check fuel pump operation (a) to (e)).
g. Reconnect the negative (-) terminal cable to the battery.
h. Turn the ignition switch ON.
i. Measure the fuel pressure.

Fuel pressure: 304-343 kPa (3.1-3.5 kgf/Sq.cm, 44-50 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
j. Remove the LEXUS hand-held tester from the DLC3.
k. Start the engine.
l. Measure the fuel pressure at idle.

Fuel pressure: 304-343 kPa (3.1 -3.5 kgf/Sq.cm, 44-50 psi)

If pressure is not as specified, check the fuel pressure regulator.

m. Stop the engine.
n. Check that the fuel pressure remains as specified for 5 minutes after the engine has stopped.

Fuel pressure: 147 kPa (1.5 kgf/Sq.cm, 21 psi) or more

If pressure is not as specified, check the fuel pump, pressure regulator and/or injectors.

o. After checking fuel pressure, disconnect the negative (-) terminal cable from the battery and carefully remove the SST to prevent gasoline from splashing.
SST 09268-45014

p. Install the fuel inlet pipe to the fuel pipe support with 2 new gaskets and the union bolt.

Torque: 29 N.m (300 kgf.cm, 21 ft.lbf)

q. Reconnect the negative (-) terminal cable to the battery.
r. Check for fuel leaks.

3. INSPECT FUEL PUMP





a. Remove the luggage compartment floor mat.
b. Remove the luggage compartment trim cover.
c. Disconnect the fuel pump connector.
d. Using an ohmmeter, measure the resistance between terminals.

Resistance: 0.2-3.0 ohms at 20°C (68°F)

If the resistance is not as specified, replace the fuel pump and/or fuel suction tube.





e. Inspect the fuel pump operation.
Connect the positive (+) lead from the battery to terminal 1 of the connector, and the negative (-) lead to terminal 2. Check that the fuel pump operates.

NOTE:
- These tests must be performed quickly (within 10 seconds) to prevent the coil from burning out.
- Keep the fuel pump as far away from the battery as possible.
- Always connect or disconnect at the battery.

If operation is not as specified, replace the fuel pump and/or fuel suction tube.

f. Reconnect the fuel pump connector.
g. Reinstall the luggage compartment trim cover.
h. Reinstall the luggage compartment floor mat.