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Fuel Gauge Circuit

NOTE: If Lexus hand-held tester is not available, begin testing with step 2).
  1. Connect Lexus hand-held tester to Data Link Connector No. 3 (DLC3). With tester in ACTIVE TEST mode, operate fuel gauge. If fuel gauge needle moves as commanded by tester, perform next check listed in appropriate symptom diagnosis table. See TROUBLE SHOOTING . If fuel gauge needle does not move as commanded by tester, go to next step.
  2. Check fuel gauge. See FUEL GAUGE  under COMPONENT TESTS. Repair as necessary. If fuel gauge is okay, go to next step.
  3. Check fuel gauge sending units. See FUEL GAUGE  under COMPONENT TESTS. Repair as necessary. If fuel gauge sending unit is okay, go to next step.
  4. Check combination meter 22-pin connector at circuit plate. See Figure. See INSTRUMENT CLUSTER CIRCUIT PLATE  under COMPONENT TESTS. Repair as necessary. If voltages are to specification, replace instrument cluster.
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