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Fuel Gauge & Warning Light Test: Prizm

  1. Unplug connector at fuel tank sending unit. Connect a 12-volt, 3.4-watt test light between lead wire and ground. Turn ignition on. Test light should flash and needle should move toward "F".
  2. Turn ignition off. Connect ohmmeter to sending unit terminals. Move sender arm and ensure resistance varies within specifications. See PRIZM FUEL SENDING UNIT RESISTANCE table. Gauge pointer should move when sender is connected and float arm is moved.
    PRIZM FUEL SENDING UNIT RESISTANCE

    Float Position Ohms
    Full 115
    3/4 90
    1/2 60
    1/4 30
    Empty 3
  3. Check gauge resistance by measuring across terminals with ohmmeter. Ignition must be off and connector unplugged. See FUEL & TEMPERATURE GAUGE RESISTANCE table.
FUEL & TEMPERATURE GAUGE RESISTANCE

Model Terminal Connector Fuel (Ohms) Temp. (Ohms)
Prizm C-D 55 N/A
Prizm G-H N/A 56
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