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Fuel Gauge Circuit Test (RAV4)

  1. Disconnect Dark Gray 5-pin fuel tank main 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 .
  2. Reconnect main sending unit connector. Disconnect Gray 2-pin fuel tank sub 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 .
  3. Disconnect Dark Gray 5-pin fuel tank main sending unit connector. Connect a 12-volt, 3.4-watt test light between terminal No. 3 of main sending unit wiring harness connector and terminal No. 1 of sub sending unit wiring harness connector. See Figure and Figure .
  4. With ignition switch in ON position, test light should be on and gauge needle should move toward FULL. If test light is off and gauge needle does not move, check wiring harness for open. Repair as necessary. If wiring harness checks good, perform FUEL GAUGE RESISTANCE TEST .
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