fuel pump LEXUS LS430 2003 Factory User Guide

SYSTEM
3.KEEP GASOLINE AWAY FROM RUBBER AND LEATHER PARTS
4.DISCHARGE FUEL SYSTEM PRESSURE
a. Using the F/PMP relay:
1. Remove the engine room R/B cover upper.
2. Remove the F/PMP relay.
3. Start the engine.
4. After the engine has stopped, turn the ignition switch OFF.
5. Crank the engine. Check that the engine does not start.
6. Remove the fuel tank cap to discharge pressure from the fuel tank.
7. Disconnect the negative (-) battery terminal cable.
8. Reinstall the F/PMP relay.
b. Using the fuel pump connector:
1. Remove the rear seat cushion.
2. Remove the rear floor service hole cover.
3. Disconnect the fuel pump connector.
4. Start the engine.
5. After the engine has stopped, turn the ignition switch OFF.
6. Crank the engine. Check that the engine does not start.
7. Remove the fuel tank cap to discharge pressure from the fuel tank.
8. Disconnect the cable from the negative (-) battery terminal.
9. Reconnect the fuel pump connector.
10. Install the rear floor service hole cover.
11. Install the rear seat.

Fig. 14: Connecting Hand-Held Tester (With CAN VIM) To DLC3 Connector Terminal
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
3. Select the ACTIVE TEST mode on the hand-held tester.
HINT:
Please refer to the hand-held tester operator's manual for further details.
4. Check that there are no leaks from any part of the fuel system.
5. Turn the ignition switch LOCK.
6. Disconnect the hand-held tester from the DLC3.
ON-VEHICLE INSPECTION
1.CHECK FUEL PUMP OPERATION
a. Connect the hand-held tester (with CAN VIM) to the DLC3.
b. Turn the ignition switch ON and push the hand-held tester main switch ON.
Do not start the engine.

Fig. 15: Connecting Hand-Held Tester DLC3
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c. Select the ACTIVE TEST mode on the hand-held tester.
d. Please refer to the hand-held tester operator's manual for further details.
e. 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 the
fusible link, fuses, EFI MAIN relay, fuel pump, ECM and wiring connections.
f. Turn the ignition switch to LOCK.
g. Disconnect the hand-held tester from the DLC3.
2.CHECK FUEL PRESSURE
a. Check that the battery positive voltage is above 12 V.
b. Disconnect the negative (-) terminal cable from the battery.
c. Remove the fuel pressure pulsation damper from the RH delivery pipe (see REPLACEMENT
).
d. Install the fuel pipe sub-ass
y No. 2 and SST (pressure gauge) to the delivery pipe with the 3 lower

gaskets and SST (union bolt).
SST 09268-45014 (09268-41190, 90405-06167)
Torque: 39 N.m (400 kgf.cm, 29 ft.lbf)
Fig. 16: Checking Fuel Pressure

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
e. Wipe off any splattered gasoline.
f. Reconnect the negative (-) terminal cable to the battery.
g. Connect the hand-held tester (with CAN VIM) to the DLC3 (see step 1 (a) b c d to (e)).
h. Measure the fuel pressure.
Fuel pressure:
304 to 343 kPa (3.1 to 3.5 kgf/cm2, 44 to 50 psi)
If pressure is high, replace the fuel pressure regulator.
If pressure is low, check the fuel hoses, fuel hose connections, fuel pump, fuel filter and fuel

pressure regulator.
i. Disconnect the hand-held tester from the DLC3.
j. Start the engine.
k. Measure the fuel pressure at idle.
Fuel pressure: 304 to 343 kPa (3.1 to 3.5 kgf/cm2, 44 to 50 psi)
l. Stop the engine.
m. 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.
n. After checking fuel pressure, disconnect the negative (-) terminal cable from the battery and
carefully remove the SST to prevent gasoline from spilling.
SST 09268-45014
o. Reinstall the fuel pressure pulsation damper to the RH delivery pipe (see REPLACEMENT
).
p. Reconnect the negative (-) terminal cable to the battery.
q. Check for fuel leaks.
3.INSPECT FUEL PUMP

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Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Remove the rear seat cushion.
b. Remove the 3 cap nuts and floor service hole cover.
c. Disconnect the fuel pump & sender gauge connector.
d. Using an ohmmeter, measure the resistance between terminals 4 and 5.
Standard: 0.2 to 3.0 ohms at 20°C (68°F)
If the resistance is not as specified, replace the fuel pump.
e. Inspect the fuel pump operation.
Connect the battery's positive (+) lead to terminal 4 of the connector, and the negative (-) lead to
terminal 5. Check that the fuel pump operates.

Fig. 18: Inspecting Fuel Pump Operation
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f. Reconnect the fuel pump & sender gauge connector.
g. Reinstall the floor service hole cover with the cap nuts.
h. Reinstall the rear seat cushion.
INSPECTION
1.INSPECT FUEL INJECTOR ASSY
a. Inspect the in
jector resistance.

Torque: 30 N.m (310 kgf.cm, 22 ft.lbf)
HINT:
Use a torque wrench with a fulcrum length of 30 cm (11.81 in.).
Fig. 25: Measuring Fulcrum Length

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2.INSPECT FUEL PUMP ASSY
a. Inspect the fuel pump resistance.
1. Using an ohmmeter, measure the resistance between terminals 4 and 5.
Standard: 0.2 to 3.0 ohms at 20°C (68°F)
b. Inspect fuel pump operation.
1. Apply battery voltage to both terminals. Check that the pump operates.

COMPONENTS
Fig. 35: Exploded View Of Fuel Pump Assy Components (1 Of 2)

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Fig. 36: Exploded View Of Fuel Pump Assy Components (1 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.