Temperature Gauge

Unplug connector at coolant temperature sender. Connect a 12-volt, 3.4-watt test light between wire and ground. Turn ignition on. Bulb should start flashing and needle of gauge should vibrate.

Connect ohmmeter between sender terminal and body of sender. Check resistance at several coolant temperature. Replace sender if inaccurate.

COOLANT TEMPERATURE SENDER RESISTANCE

Model

Temperature: °F (°C)

Resistance: (Ohms)

Camry

122 (50)

⁽¹⁾ 190-260

140 (60)

⁽²⁾ 152-154

239 (115)

⁽¹⁾ 24-28

239 (115)

⁽²⁾ 23-28

Pickup & 4Runner

140 (60)

143-174

239 (115)

22-26

All Others

122 (50)

190-260

239 (115)

24-29

⁽¹⁾	For Nippondenso gauge.

⁽²⁾	For Yazaki gauge.

Check gauge resistance by measuring across terminals with ohmmeter. Ignition must be off and connector unplugged. See FUEL & TEMPERATURE GAUGE RESISTANCE table.
Connect one end of test light to sender terminal and other end to battery voltage. With engine running, test light should flash. Test light should not light when engine is stopped.

NOTE: Bulb may come on briefly when engine is stopped, but bulb should not remain on.