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Resistance Check

NOTE: Most models have a combination temperature sending unit that includes a resistance sender and a temperature switch. The smaller terminal is the resistance sender. Temperature values for the sending unit are stamped in the body of the sender.
  1. Connect test resistor between sending unit wire and ground. Turn ignition on. Gauge readings should match those shown in following table.
    GAUGE RESISTANCE CHECK

    Model & Gauge (1) Gauge Reading Resistance (Ohms)
    528e
      Fuel Gauge Full 3
      Half 36
      Empty 73
    733i
      Fuel Gauge Full 5
      Half 50
      Empty 82
      Temperature Gauge 104°F (40°C) 288
      140°F (60°C) 125
      240°F (115°C) 26
    (1) Resistance values were not available for 320i or 633CSi models.
  2. Remove sending unit and check resistance at position or temperature specified. Resistance should be close to specifications in table. If not, replace sending unit.
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