2003 LEXUS LS430 fuel

OK: GO TO NEXT STEP
2.READ VALUE OF HAND-HELD TESTER (FUEL GAUGE)
a. Operate the hand-held tester according to the steps on the display and select the "DATA LIST".
METER:
Fig. 56: Data List Reference Table (Meter)

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OK:
Fuel value signal displayed on the tester is almost the same as needle indication.
NG: REPLACE COMBINATION METER ASSY (SEE OVERHAUL
)
OK: GO TO NEXT STEP
3.READ VALUE OF HAND-HELD TESTER (FUEL GAUGE)
a. Operate the hand-held tester according to the steps on the display and select the "DATA LIST".
BODY No.4:
Fig. 57: Data List Reference Table (Body No.4)

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OK:
Fuel value signal displayed on the tester is almost the same as needle indication.
NG: Go to step 4
OK: Go to step 4
REPLACE LUGGAGE ROOM JUNCTION BLOCK ASSY
OK:
Normal operation
NG: REPLACE COMBINATION METER ASSY (SEE OVERHAUL
)
OK: END
4.INSPECT FUEL SENDER GAUGE ASSY (MAIN)
a. Measure the voltage according to the value (s) in the table below.
Standard
FUEL SENDER GAUGE CONNECTOR TERMINALS VOLTAGE SPECIFICATIONS
b. Remove the fuel sender gauge assy.
c. Connect the fuel sender gauge connector.
d. Check that the float position is between E and F.
e. Measure the voltage between the terminals 2 and 1 of connector according to the value (s) in the
table below.
Standard
VOLTAGE SPECIFICATIONS
NG: REPLACE FUEL SENDER GAUGE ASSY (MAIN)
Tester ConnectionConditionSpecified Condition
F19-1 - F19-3Ignition switch ACC or ONBelow 1 to 5 V
Float levelFloat position mm (in.)Voltage (V)
F-34.8 (-1.37) +/- 3(0.12)4.5 to 4.75
1/292.8(3.65) +/- 3(0.12)1.41 +/- 1.61
Warning137.0(5.39) +/- 3(0.12)0.20 to 0.45

Fig. 58: Identifying Fuel Sender Gauge Connector Terminals
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Fig. 59: Identifying Float Position
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OK: GO TO NEXT STEP
5.CHECK HARNESS AND CONNECTOR (FUEL SENDER GAUGE ASSY - LUGGAGE ROOM
JUNCTION BLOCK ASSY) (SEE HOW TO PROCEED WITH TROUBLESHOOTING
)
a. Disconnect the F19, L13 and L14 connectors.
b. Measure the resistance according to the value (s) in the table below.
Standard
RESISTANCE SPECIFICATIONS
Tester ConnectionConditionSpecified Condition
L14-6 - F19-1AlwaysBelow 1 ohms
L14-4 - F19-2AlwaysBelow 1 ohms
L13-10 - F19-3AlwaysBelow 1 ohms

Fig. 60: Identifying Fuel Sender Gauge Assy And Luggage Room Junction Block Assy Connector
Terminals
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NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: GO TO NEXT STEP
6.INSPECT FUEL SENDER GAUGE ASSY (SUB)
a. Measure the voltage according to the value (s) in the table below.
Standard
VOLTAGE SPECIFICATIONS
b. Remove the fuel sender gauge assy.
c. Connect the fuel sender gauge connector.
d. Check that the float position is between E and F.
e. Measure the voltage between the terminals 2 and 1 of connector according to the value (s) in the
table below.
Standard
VOLTAGE SPECIFICATIONS
Tester ConnectionConditionSpecified Condition
F20-1 - F20-3Ignition switch ACC or ONBelow 1 to 5 V
Float levelFloat position mm (in.)Voltage (V)
F1.4(0.06) +/- 3(0.12)4.5 to 4.75
1/2190.2(7.49) +/- 3(0.12)0.45 +/- 0.65
Warning195.7(7.70) +/- 3(0.12)0.20 to 0.45

Fig. 62: Identifying Float Position
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NG: REPLACE FUEL SENDER GAUGE ASSY (SUB)
OK: GO TO NEXT STEP
7.CHECK HARNESS AND CONNECTOR (FUEL SENDER GAUGE ASSY - LUGGAGE ROOM
JUNCTION BLOCK ASSY) (SEE HOW TO PROCEED WITH TROUBLESHOOTING
)
a. Disconnect the F20, L13 and 14 connectors.
b. Measure the resistance according to the value (s) in the table below.
Standard
RESISTANCE SPECIFICATIONS
Tester ConnectionConditionSpecified Condition
L14-7 - F19-1AlwaysBelow 1 ohms
L13-9 - F19-2AlwaysBelow 1 ohms
L14-15 - F19-3AlwaysBelow 1 ohms

Fig. 63: Identifying Fuel Sender Gauge Assy And Luggage Room Junction Block Assy Connector
Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: REPLACE LUGGAGE ROOM JUNCTION BLOCK ASSY
WIRING DIAGRAM
Fig. 64: Water Temperature Receiver Gauge Wiring Diagram

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INSPECTION PROCEDURE
HINT:
If there is an open or short in the engine coolant temperature sensor circuit, the ECM outputs DTCs. Perform
troubleshooting with the "SFI System 10-2".
1.PERFORM ACTIVE TEST BY HAND-HELD TESTER
a. Operate the hand-held tester according to the steps on the display and select the "ACTIVE TEST".
METER:
ACTIVE TEST REFERENCE

c. Compare the result of the test with the standard indication.
DC 13.5 V, 25°C (77°F)
Fig. 89: Tachometer Acceptable Reference Chart

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4.INSPECT FUEL RECEIVER GAUGE
a. Disconnect the connector from the sender gauge.
b. Connect terminals 1 and 2 on the wire harness side connector of the fuel sender gauge.
c. Turn the ignition switch to the ON position, then check the position of the receiver gauge needle.
OK:
Needle position is on (EMPTY).
d. Connect terminals 2 and 3 on the wire harness side connector of the fuel sender gauge.
e. Turn the i
gnition switch to the ON position, then check the position of the receiver gauge needle.