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Temperature Gauge

  1. Unplug connector at coolant temperature sender. Connect a 3.4 watt test lamp between wire and ground. Turn ignition on. Bulb should start flashing and needle of gauge should vibrate.
  2. Connect ohmmeter between sender terminal and body of sender. Check resistance at several coolant temperature. Replace sender if inaccurate.
    COOLANT TEMPERATURE SENDER RESISTANCE

    Model Type Temperature °F (°C) Resistance (Ohms)
    Camry 122 (50) 192-260
    " 176 (80) 65-89
    Celica, Cressida, Tercel & Van 122 (50) 190-260
    " 239 (115) 24-29
    Land Cruiser 122 (50) 226
    " 240 (115) 26
    Pickup & 4Runner 140 (60) 120-173
    " 239 (115) 22-26
    Supra 122 (50) 164-234
    " 239 (115) 20-24
  3. Check gauge resistance by measuring across terminals with ohmmeter. Ignition must be off and connector unplugged. See FUEL & TEMPERATURE GAUGE RESISTANCE  table.
  4. Connect one end of test lamp to sender terminal and other end to battery voltage. With engine running, test lamp should flash. Lamp should not light when engine is stopped.
NOTE: Bulb may come on briefly when engine is stopped, but should not remain lit.
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