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Temperature Gauge & Sender Test: Prizm

  1. Unplug connector at coolant temperature sender. Connect a 12-volt, 3.4-watt test light between wire and ground. Turn ignition on. Bulb should flash and gauge needle should vibrate.
  2. Connect ohmmeter between sender terminal and body of sender. Check resistance while heating sender in water. See PRIZM COOLANT TEMPERATURE SENDER RESISTANCE table. Replace sender if inaccurate.
    PRIZM COOLANT TEMPERATURE SENDER RESISTANCE

    Temperature °F (°C) Resistance (Ohms)
    122 (50) (1) 190-260
    140 (60) (2) 152-154
    239 (115) (1) 24-28
    239 (115) (2) 23-28
    (1) For models without tachometer.
    (2) For tachometer equipped models.
  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 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.
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