Sending Units (Resistance Check)

Most models have a combination temperature sending unit (a resistance sender and temperature switch). Smaller terminal is resistance sender. Sending unit temperature values are stamped on sender body.

Connect a test resistor between sending unit wire and ground. Turn ignition on. Check gauge readings and compare to specifications. Refer to the COOLANT TEMPERATURE SENSOR RESISTANCE  table, COOLANT GAUGE RESISTANCE  table or the FUEL GAUGE RESISTANCE  table. Remove sending unit and check resistance at position or temperature specified. If resistance is not to specifications, replace sending unit.