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

FUEL GAUGE CONTROL OUTLINE

• 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

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

• 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
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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INSTRUMENTATION/DRIVER INFO.
IG1 B+
1G
INSTRUMENT
CLUSTER
MICROCOMPUTER
2R 2T
FUEL GAUGE
SENDER UNIT (MAIN)
IG1 B+
1G
INSTRUMENT
CLUSTER
CAN
CONTROL
CIRCUIT
1J
PCM
CHU092255430S15
CHU092255430S16
1C
FUEL GAUGE
2P 1E
FUEL GAUGE
SENDER UNIT (SUB)
CHU0922S106
CHU092255430S17
CHU092255430S18
1C
WATER TEMPERATURE
GAUGE
MICROCOMPUTER
1L 1E
CHU0922S107
09–22–11
09–22