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METER / GAUGE SYSTEM PRECAUTION

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  1. FUEL RECEIVER GAUGE OPERATION


    1. OPERATION

      The combination meter assembly uses the fuel injection volume signal from the ECM, fuel sender gauge assembly and No. 2 fuel sender gauge assembly to detect the amount of fuel remaining in the fuel tank assembly. Each gauge assembly has a variable resistor whose resistance changes according to the amount of fuel remaining. The gauge assemblies receive voltage from the combination meter assembly and change the voltage based on the resistance that changes according to the amount of fuel remaining in the fuel tank assembly. The combination meter assembly receives a fuel injection volume signal from the ECM and detects the voltage between each variable resistor and each resistor in the combination meter assembly, and operates the fuel receiver gauge.

    2. FUEL RECEIVER GAUGE READING


      1. During normal driving:

        As the fuel level in the fuel tank assembly changes when driving on a hill or applying brakes, the fuel receiver gauge reading is updated according to the fuel injection volume during normal driving. However, as the fuel injection volume measurement has a margin of error, the value is indicated after correction by input values from the fuel sender gauge assembly and No. 2 fuel sender gauge assembly.

      2. During refueling:

        The fuel level in the fuel tank assembly rises rapidly when fuel is added. If the averaging process that is used during normal driving is used in this case, the fuel receiver gauge reading cannot be updated promptly. Therefore, when it is judged that fuel is being added to the vehicle based on the shift lever position and changes in the fuel level, output values from the fuel sender gauge assembly and No. 2 fuel sender gauge assembly are immediately reflected in the fuel receiver gauge reading. This control is called refueling judgment.

  2. PRECAUTION FOR REPLACING COMBINATION METER ASSEMBLY


    1. When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.