Fuel System

1. CHECK FUEL PUMP OPERATION




a. Connect a LEXUS hand-held tester to the DLC3.

b. Turn the ignition switch ON, and push the 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 (+) lead from the battery to terminal 1 of the connector, and the negative (-) lead to terminal 2.

NOTE:
- These test must be done quickly (within 10 seconds) to prevent the coil from burning out.
- Keep the fuel pump as far away from the battery as possible.
- Always do the switching at the battery side.




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 OFF.
h. Disconnect the LEXUS hand-held tester from the DLC3.




2. INSPECT FUEL PUMP RESISTANCE
Using an ohmmeter, measure the resistance between the 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 set plate.

3. 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 RH fuel pressure pulsation damper.




d. Install the fuel inlet hose and SST (pressure gauge) to the delivery pipe with 3 lower gaskets and the SST (union bolt).
SST 09268-45014 (09268-41190, 90405-06167)
Torque: 39 Nm (400 kg.cm, 29 ft.lb)

e. Wipe off any splattered gasoline.




f. Connect the LEXUS hand-held tester to the DLC3. (See step 1. (a) to (e) above)
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 kg/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 kg/Sq.cm, 44 - 50 psi)
If pressure is not as specified, check the vacuum sensing hose and 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 kg/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 09268-45012

p. Reinstall the fuel pressure pulsation damper.
q. Reconnect the negative (-) terminal cable to the battery.
r. Check for fuel leaks.