Fuel gauge sender unit (main)

1. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
2. Remove the rear seat cushion. (See REAR SEAT CUSHION REMOVAL/INSTALLATION .)
3. Remove the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION .)
4. Remove the fuel gauge assembly.
5. Remove the fuel gauge sender unit (main). (See FUEL GAUGE SENDER UNIT REMOVAL/INSTALLATION [AWD] .)
6. Reconnect the fuel gauge sender unit (main) connector to the fuel pump unit.
7. Verify that the resistance at fuel gauge sender unit (main) terminals D and C is as follows according to the height of the float.

Resistance when float is in the highest position 

• 18.5-21.5 ohms

Resistance when float is in the lowest position 

• 197-203 ohms

Fig 1: Checking Resistance At Fuel Gauge Sender Unit (Main) Terminals D And C According To Height Of Float

Courtesy of MAZDA MOTORS CORP.

• If the resistance is not within the specification, replace the fuel gauge sender unit (main). (See FUEL GAUGE SENDER UNIT REMOVAL/INSTALLATION [AWD] .)