2003 LEXUS LS430 Identifying ac

Fig. 52: Identifying Signal Waveform
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NG: Go to step 5
OK: REPLACE COMBINATION METER ASSY (SEE OVERHAUL
)
5.CHECK HARNESS AND CONNECTOR (ECM - COMBINATION METER ASSY) (SEE HOW
TO PROCEED WITH TROUBLESHOOTING )
a. Disconnect the C12 and E2 connectors.
b. Measure the resistance according to the value (s) in the table below.
Standard
C12 AND E2 CONNECTORS RESISTANCE SPECIFICATIONS
Tester ConnectionConditionSpecified Condition
C12-4 - E2-16AlwaysBelow 1 ohms
C12-4 - Body groundAlways10 kohms or higher

Fig. 53: Identifying C12 And E2 Connectors
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NG: REPAIR OR REPLACE HARNESS AND CONNECTOR
OK: GO TO NEXT STEP
6.INSPECT COMBINATION METER ASSY
a. Disconnect the E2 connector.
b. Measure the voltage according to the value (s) in the table below.
Standard
E2 CONNECTOR VOLTAGE SPECIFICATIONS
NG: REPLACE COMBINATION METER ASSY (SEE OVERHAUL
)
Fig. 54: Identifying E2 Connector

Tester ConnectionConditionSpecified Condition
E2-16 - Body groundIgnition switch ON10 to 14 V

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
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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

Fig. 67: Identifying Front Seat Inner Belt Assy (Driver Side) Connector Front View
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OK: GO TO NEXT STEP
4.CHECK HARNESS AND CONNECTOR (FRONT SEAT INNER BELT ASSY - BODY
GROUND) (SEE HOW TO PROCEED WITH TROUBLESHOOTING
)
a. Disconnect the connector from the front seat inner belt assy (Driver Side).
b. Measure the resistance according to the value (s) in the table below.
Standard
RESISTANCE SPECIFICATIONS
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
Tester ConnectionConditionSpecified Condition
B4-5 - Body groundAlwaysBelow 1 ohms