What are the resistance values at intermediate fuel levels?

3/4 tank: 22 - 23 ohms; 1/2 tank: 35 - 38 ohms; 1/4 tank: 59 - 60 ohms.

How is the speedometer cable removed on M/T models?

Press to disconnect the cable; push to connect it. A separate illustration is provided for A/T models.

What are the float arm position measurements for checking the fuel gauge unit?

36 mm (1.42 in), 60 mm (2.36 in), 97 mm (3.82 in), 135 mm (5.31 in), and 151 mm (5.94 in), as shown in the diagram.

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1990 Nissan Micra Fuel Tank Gauge Unit Check & Speedometer Cable Removal EL-48

Fuel tank gauge unit check and speedometer cable removal instructions

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Service procedure for checking the fuel tank gauge unit and removing the speedometer cable, with measurement values and figures.

AI caption February 2006 · Photo 394 of 412

This page (EL-48) from the 'Meter and Gauges' section of a factory service manual covers two procedures. The left side shows the Fuel Tank Gauge Unit Check: an illustrated diagram of the fuel sender unit with float arm positions and the corresponding resistance specifications — Full (7-9 ohms), 3/4 (22-23 ohms), 1/2 (35-38 ohms), 1/4 (59-60 ohms), and Empty (88-92 ohms). Dimensional measurements for the float arm positions are given in mm (in): 36 (1.42), 60 (2.36), 97 (3.82), 135 (5.31), and 151 (5.94). Illustration reference SEL409G. The right side shows Speedometer Cable Removal, with illustrations for A/T (automatic transmission) models and M/T (manual transmission) models, indicating 'Press to disconnect' and 'Push to connect' for the cable end at the transmission. Illustration reference SEL976C. This page lets a technician bench-test the fuel level sender with an ohmmeter and shows how to detach and reattach the speedometer cable for both transmission types. The document itself does not state a year, make, or model; it was uploaded to a gallery for a 1990 Nissan Micra.

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Frequently asked questions

What resistance should the fuel tank gauge unit read when the tank is full?: 7 - 9 ohms at Full.
What resistance indicates an empty tank on the fuel gauge sender?: 88 - 92 ohms at Empty.
What are the resistance values at intermediate fuel levels?: 3/4 tank: 22 - 23 ohms; 1/2 tank: 35 - 38 ohms; 1/4 tank: 59 - 60 ohms.
How is the speedometer cable removed on M/T models?: Press to disconnect the cable; push to connect it. A separate illustration is provided for A/T models.
What are the float arm position measurements for checking the fuel gauge unit?: 36 mm (1.42 in), 60 mm (2.36 in), 97 mm (3.82 in), 135 mm (5.31 in), and 151 mm (5.94 in), as shown in the diagram.