Fuel Gauge & Warning Light

Unplug connector at fuel tank sending unit. Connect a 3.4 watt test lamp between Yellow/Red wire and ground. Turn ignition on. Bulb should start flashing and needle should vibrate.

Connect ohmmeter to sending unit terminal and ground. Move sender arm and check that resistance varies smoothly. Pointer of gauge should move when sender is connected to it and float arm is moved.

Fuel Sending Unit Resistance

Model

Float Position

Resistance (Ohms)

Land Cruiser

Full

15-19

Half

35-45

Empty

113-127

All Other Models

Full

1-5

Half

28-37

Empty⁽¹⁾

102-118

⁽¹⁾	Pickup models are 92-108 ohms.

With gauge connector in place and ignition on, check for voltage at gauge terminals. At one terminal, 2-7 volts should be present. Check gauge resistance by measuring across terminals. Be sure ignition is off and connector unplugged.
To check low fuel warning light sensor, remove fuel sender from tank. Connect battery voltage to sensor terminal. Connect a 3.4 watt test lamp between body of sending unit and ground. With sensor dry, light should come on within 40 seconds. With sensor in gasoline or water, light should not come on.

Fuel & Temperature Gauge Internal Resistance

Model		Terminal Conn.	Fuel (Ohms)	Temp. (Ohms)
BIMETAL GAUGE (2 Term.)
	Celica, Corolla, Tercel Starlet & Supra		55	55
	Land Cruiser & Pickup		25	25
COIL GAUGE (3 Term.)
	Corolla	IG-U	80	65
		U-E	220	21
		IG-E	300	46
	Corona	IG-S	60	125
		S-E	160	160
		IG-E	220	285
	Cressida	IG-U	60	95
		U-E	160	110
		IG-E	220	205
	Tercel	IG-U	87	91
		U-E	242	90
		IG-E	328	182