LX 450 L6-4.5L (1FZ-FE) (1996)
Fuel Pressure Regulator: Testing and Inspection
FUEL PUMP ON-VEHICLE INSPECTION
1. Check fuel pump operation.
(a) Remove the fuse cover on the instrument panel.
(b) Connect the LEXUS hand-held tester to the DCL 3.
(c) Turn the ignition switch ON and LEXUS hand-held tester main switch ON.
NOTICE: Do not start the engine.
(d) Select the active test mode on the LEXUS hand-held tester.
(e) Please refer to the LEXUS hand - held tester operator's manual for further details.
(f) If you have no LEXUS hand-held tester, connect the positive (+) and negative (-) leads from the battery to the fuel pump connector.
(g) 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.
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If there is no pressure, check these parts:
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Fusible links
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Fuses
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EFI main relay
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Fuel pump
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ECM
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Wiring connections
(h) Turn the ignition switch OFF.
(i) Disconnect the LEXUS hand-held tester from the DCL 3.
(j) Reinstall the fuse cover on the instrument panel.
2. Check fuel pressure.
(a) Check the battery voltage is above 1 2 V.
(b) Disconnect the negative (-) terminal cable from the battery.