Fuel Gauge & Wiring Harness Operational Test (Except Land Cruiser & RAV4)
- Disconnect fuel tank sending unit connector. Turn ignition switch to ON position. If fuel gauge indicates EMPTY, go to next step. If fuel gauge does not indicate EMPTY, repair short in wiring harness. See WIRING DIAGRAMS .
- Connect a 12-volt, 3.4-watt test light between appropriate terminals of sending unit wiring harness connector. See FUEL GAUGE & HARNESS TEST table. See Fig 1-Fig 3 .
- With ignition switch in ON position, test light should be on and gauge needle should move toward FULL. If test light is not on and gauge needle does not move, check wiring harness for open. Repair as necessary. If wiring harness is okay, perform FUEL GAUGE RESISTANCE TEST.
FUEL GAUGE & HARNESS TEST
| Model | Sending Unit Harness Connector Terminals No. |
|---|---|
| Sienna, Tacoma & 4Runner | 2 & 3 |
| T100 | 1 & 2 |
Fig 1: Identifying Fuel Sending Unit Harness Connector Terminals (Land Cruiser, RAV4 (Main Unit), Sienna, Tacoma & 4Runner)