Purpose
The fuel gauge notifies the user of the amount of remaining fuel.
Function
The instrument cluster calculates the amount of fuel in the fuel tank based on the following CAN signals and displays the fuel gauge segments.
Fuel gauge sender unit voltage signal sent from rear body control module (RBCM)
Fuel injection amount signal, vehicle speed signal sent from PCM
Fuel gauge flicker prevention function
When the instrument cluster determines that the vehicle is being driven, it retards the response with which the calculated amount of fuel is reflected to the fuel gauge. As a result, fuel gauge flicker caused by the variation of fuel surface during driving is prevented.
Refuel determination function
If the amount of fuel is changed by 5 L {1 US gal, 1 Imp gal}/2 L {0.5 US gal, 0.4 Imp gal}*1 or more while the vehicle is stopped, the instrument cluster determines that the vehicle is refueled and displays the fuel gauge segments based on the fuel gauge sender unit voltage signal from the rear body control module (RBCM).
Construction
The fuel gauge is displayed in the LCD of the instrument cluster.
The fuel gauge is consists of 15 segments.

Operation
When the ignition is switched ON (engine off or on), the rear body control module (RBCM) converts the resistance from the fuel gauge sender unit to voltage and sends it to the instrument cluster as a fuel gauge sender unit voltage signal (1).
The instrument cluster receives the fuel gauge sender unit voltage signal from the rear body control module (RBCM), and it also receives the fuel injection amount signal and vehicle speed signal from the PCM (2).
The instrument cluster calculates the amount of fuel in the fuel tank based on the signals (3).
The instrument cluster displays/turns off the fuel gauge segments according to the calculation result (4).

Fail-safe
Function not equipped.
Ambient Temperature Display Switching Procedure
Fuel Gauge Sender Unit Inspection [2 Wd]Changing a Flat Tire
NOTE
If the following occurs while driving, it could indicate a flat tire.
• Steering becomes difficult.
• The vehicle begins to vibrate excessively.
• The vehicle pulls in one direction.
If you have a flat tire, drive slowly to a level spot that is well off the road
and out of the way ...
Light Bulbs
WARNING
Do not replace the xenon fusion bulbs yourself:
Replacing the xenon fusion bulbs yourself is dangerous. Because the xenon fusion
bulbs require high voltage, you could receive an electric shock if the bulbs are
handled incorrectly. Consult an Authorized Mazda Dealer when the replaceme ...
Heated Oxygen Sensor (HO2 S)
Purpose/Function
Detects the oxygen concentration (theoretical air/fuel ratio) in the exhaust
gas as basic information for mainly determining the fuel injection amount and
as information for determining the deterioration of catalytic converter.
Detects the oxygen concentration ( ...