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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 Temperature F° (°C) Resistance (Ohms)
    Corolla & Pickup 176 (80) 52
    212 (100) 21
    212 (100) 27-28
    Land Cruiser 122 (50) 226
    240 (115) 26
    Tercel 176 (80) 64-84
    212 (100) 36-45
    Celica, Cressida & Supra 176 (80) 71
    212 (100) 37
    All Other Models 176 (80) 48-52
  3. Check gauge resistance by measuring across terminals with ohmmeter. Ignition must be off and connector unplugged. Resistance should be as shown in "Fuel and 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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