Fuel System
ON-VEHICLE INSPECTION
1. CHECK FUEL PUMP OPERATION
a. Connect a LEXUS hand-held tester or OBD II scan tool to the DLC3.
b. Turn the ignition switch ON, and press the LEXUS hand-held tester or OBD II scan tool main switch ON.
NOTE: Do not start the engine.
c. Select the ACTIVE TEST mode on the LEXUS hand-held tester or OBD II scan tool.
d. Please refer to the LEXUS hand-held tester or OBD II scan tool operator's manual for further details.
e. If you have no LEXUS hand-held tester or OBD II scan tool, connect the positive (+) and negative (-) leads from the battery to the fuel pump connector.
f. Disconnect the fuel return hose from the clamp on the V-bank cover.
g. Remove the 2 bolts, nuts and V- bank cover.
h. Check that the pulsation damper screw pop up when the fuel pump operates.
If operation is not as specified, check following parts:
- Fusible link
- Fuses
- EFI main relay
- Fuel pump
- ECM
- Wiring connections
i. Turn the ignition switch OFF.
j. Disconnect the LEXUS hand-held tester or OBD II scan tool 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 front fuel pipe from the LH delivery pipe.
d. Install the front fuel pipe and SST (pressure gauge) to the delivery pipe with the 3 lower gaskets and SST (adaptor).
SST 09268-45014 (09268-41190, 90405-06167)
Torque: 39 N.m (400 kgf.cm, 29 ft.lbf)
e. Wipe off any splattered gasoline.
f. Reconnect the negative (-) terminal cable to the battery.
g. Connect a LEXUS hand-held tester or OBD II scan tool to the DLC3 (See (a) to (e) step 1 on the check fuel pump operation).
h. Measure the fuel pressure.
Fuel pressure: 265 - 304 kPa (2.7 - 3.1 kgf/sq.cm, 38 - 44 psi)
If pressure is higher than the specification, replace the fuel pressure regulator.
If pressure is lower than the specification, check these parts:
- Fuel hoses and connections
- Fuel pump
- Fuel filter
- Fuel pressure regulator
i. Disconnect the LEXUS hand-held tester or OBD II scan tool from the DLC3.
j. Start the engine.
k. Measure the fuel pressure at idle.
Fuel pressure: 265 - 304 kPa (2.7 - 3.1 kgf/sq.cm, 38 - 44 psi)
l. Stop the engine.
m. Check that the fuel pressure remains in the specification below for 5 minutes after the engine stop.
Fuel pressure: 147 kPa (1.5 kgf/sq.cm,21 psi) or more
If the pressure is not as specified, check the fuel pump, the pressure regulator and/or the injectors.
n. After checking the fuel pressure, disconnect the negative (-) terminal cable from the battery and carefully remove the SST to prevent gasoline from splashing.
SST 0926&-45014
o. Reinstall the front fuel pipe to the LH delivery pipe.
p. Reconnect the negative (-) terminal cable to the battery.
q. Check for fuel leaks.
r. Reinstall the V-bank cover with the 2 bolts and nuts.
s. Reconnect the fuel return hose to the clamp on the V-bank cover.
3. INSPECT FUEL PUMP
a. Remove the No.1 rear seats.
b. Remove the 2 rear door scuff plates, the step plates and the rear seat lock covers.
c. Pull off the front and rear floor carpets.
d. Remove the 2 screws and the rear floor service hole cover.
e. Disconnect the fuel pump & sender gauge connector.
f. Using an Ohmmeter, measure the resistance between terminal 4 and 5.
Resistance: 0.2 - 3.0 Ohm at 20 °C (68 °F)
If the resistance is not as specified, replace the fuel pump and / or the lead wire.
g. Inspect the fuel pump operation.
Connect the battery positive (+) lead to terminal 4 of the connector, and the battery negative (-) lead to terminal 5.
Check that the fuel pump operates.
NOTE:
- These tests must be done quickly (within 10 seconds) to prevent the coil burning out.
- Keep the fuel pump as far away from the battery as possible.
- Always change the connection on the battery side.
If operation is not as specified, replace the fuel pump and/or lead wire.
h. Reconnect the fuel pump & sender gauge connector.
i. Reinstall the rear floor service hole cover with the 2 screws.
j. Reinstall the front and rear floor carpets.
k. Remove the 2 rear door scuff plates, the step plates and the rear sear lock covers.
l. Reinstall the No.1 rear seats.