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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, replace A/C and combination meter integrated ECU. See Figure. If fuel gauge needle does not move as commanded by tester, go to next step.
  2. Check fuel gauge sending unit. See FUEL GAUGE SENDING UNIT  under COMPONENT TESTS. Repair as necessary. If fuel gauge sending unit is okay, go to next step.
  3. Check for short to battery voltage in harness or connector between A/C and combination meter integrated ECU and fuel gauge sending unit. Repair as necessary. If circuits are okay, go to next step.
  4. Check fuel gauge. See FUEL GAUGE  under COMPONENT TESTS. Repair as necessary. If fuel gauge is okay, replace combination meter circuit plate. See Figure.
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