Mazda RX-8 2004 - Fuel Gauge Control Construction;Operation; Fuel Gauge Control Outline; Water Temperature Gauge Control Outline

INSTRUMENTATION/DRIVER INFO.
09–22–11
09–22
FUEL GAUGE CONTROL OUTLINE
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• The fuel level signal is output from the fuel gauge sender unit to the microcomputer in the instrument cluster.
Fuel gauge variation caused by fluctuating fuel level when cornering or driving on a slope, is reduced by
microcomputer control.
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FUEL GAUGE CONTROL CONSTRUCTION/OPERATION
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System Wiring Diagram
Operation
• A resistance according to fuel level is sent from the fuel gauge sender unit to the microcomputer. The
microcomputer calculates the average resistance within a specified time, and sends the output signal to the
fuel gauge based on the calculated value.
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WATER TEMPERATURE GAUGE CONTROL OUTLINE
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• The engine coolant temperature signal is output from the PCM to the microcomputer in the instrument cluster.
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WATER TEMPERATURE GAUGE CONTROL CONSTRUCTION/OPERATION
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System Wiring Diagram
Operation
• The engine coolant temperature signal sent from the PCM via the CAN system is input to the microcomputer in
the instrument cluster. The microcomputer calculates the current engine coolant temperature based on the
engine coolant temperature signal, and sends an output signal to the water temperature gauge.
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2P
IG1
B+
1G
1E
2T2R
1C
INSTRUMENT
CLUSTER
MICROCOMPUTER
FUEL GAUGE
FUEL GAUGE
SENDER UNIT (MAIN)
FUEL GAUGE
SENDER UNIT (SUB)
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IG1
B+
1G
1E
1L1J
1C
CAN
CONTROL
CIRCUIT
PCM
INSTRUMENT
CLUSTER
MICROCOMPUTER
WATER TEMPERATURE
GAUGE
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