2003 LEXUS LS430 fuel system

Fig. 2: Fuel System - System Diagram (1 Of 3)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Fuel s
ystem is determined by the ECM based on signals from various sensors.

Fig. 3: Fuel System - System Diagram (2 Of 3)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 4: Fuel System - System Diagram (3 Of 3)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
PRECAUTION
1.BEFORE WORKING ON FUEL SYSTEM, DISCONNECT NEGATIVE (-) TERMINAL CABLE
FROM BATTERY
2.DO NOT SMOKE OR WORK NEAR AN OPEN FLAME WHEN WORKING ON FUEL

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.

5.FUEL SYSTEM
a. When disconnecting the high fuel pressure line, a large amount of gasoline will spill out. Observe
these procedures:
1. Perform the "DISCHARGE FUEL SYSTEM PRESSURE" procedures above. Put a container
under the connection.
2. Disconnect the fuel tube.
3. Drain the fuel remaining inside the fuel tube.
4. Protect the disconnected fuel tube from damage and foreign material by covering it with a
plastic bag.
b. When connecting the union bolt (fuel pressure pulsation damper) on the high pressure pipe union,
observe these procedures:
1. Always use 2 new gaskets.
2. Tighten the union bolt by hand.
Fig. 5: Tightening Union Bolt By Hand

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
3. Using SST, tighten the union bolt to the specified torque.
SST 09612-24014 (09617-24011)
Torque:

Fig. 13: Pulling Pipe And Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
6.CHECK FUEL LEAK
a. Check that there are no fuel leaks after doing maintenance anywhere on the fuel system.
1. Connect the hand-held tester (with CAN VIM) to the DLC3.
2. Turn the i
gnition switch ON and hand-held tester main switch ON.

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.

Headlight
Illumination
Interior Light
Key Reminder (w/ Smart Key System)
Key Reminder (w/o Smart Key System)
LEXUS Navigation System
LEXUS Parking Assist (Clearance Sonar)
LEXUS Parking Assist (Rear View Monitor)
Luggage Compartment Door Opener and Closer
Moon Roof
Multiplex Communication System (BEAN - Instrument Panel Bus)
Multiplex Communication System (BEAN - Steering Column Bus)
Multiplex Communication System (BEAN Bus)
PPS
Pre-Collision Safety System
Rear Air Conditioning
Seat Belt Warning
Smart Key System
SRS
Taillight
Theft Deterrent (w/ Smart Key System)
Tire Pressure Warning System
VSC
Wiper and Washer
Wireless Door Lock Control (w/ Smart Key System)
7.5AMPX-B3Adaptive Front-Lighting System
Automatic Light Control
Door Closer (w/ Smart Key System)
Door Lock Control (w/ Smart Key System)
Front Fog Light
Fuel Lid Opener
Headlight
Illumination
Key Reminder (w/ Smart Key System)
Light Auto Turn Off System
Luggage Compartment Door Opener and Closer
Multiplex Communication System (BEAN - Instrument Panel Bus)
Multiplex Communication System (BEAN - Steering Column Bus)
Power Tilt and Power Telescopic
Rear Air Conditioning
Remote Control Mirror
Smart Key System
Taillight
Theft Deterrent (w/ Smart Key System)
Turn Signal and Hazard Warning Light
Wiper and Washer
Wireless Door Lock Control (w/ Smart Key System)
7.5AP-ACCAudio System