Fuel Gauge & Wiring Harness Operational Test

1. Unplug fuel tank sending unit connector. Turn ignition on. If fuel gauge indicates EMPTY, go to next step. If fuel gauge does not indicate EMPTY, repair short circuit in wiring harness. See WIRING DIAGRAMS .
2. Connect a 12-volt, 3.4-watt test light between appropriate terminals of sending unit wiring harness connector. See Fig 1. See FUEL GAUGE & HARNESS TEST  table.
3. With ignition on, test light should flash and gauge needle should move toward FULL. If test light does not flash and gauge needle does not move, check wiring harness for open circuit. Repair or replace as necessary. If wiring harness checks good, replace fuel gauge.

FUEL GAUGE & HARNESS TEST

Model	Sending Unit Connector Terminals No.
Tercel	1 & 4

Fig 1: Identifying Fuel Sending Unit Harness Connector Terminals

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