Mazda 2009 RX-8, Service Highlights

Page: 282 / 299

INSTRUMENTATION/DRIVER INFO.
09-22–7
09-22
TACHOMETER CONTROL OUTLINE
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!
Variable red zone has been adopted that changes the red zone display of the engine speed according to the
engine coolant temperature.
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TACHOMETER CONTROL CONSTRUCTION/OPERATION
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Variable Red Zone Control
!
The PCM determines the red zone of the engine
speed based on the engine coolant temperature
signal from the ECT sensor, and outputs a
variable red zone display request signal to the
instrument cluster via CAN system.
!
The instrument cluster switches the variable red
zone display in the tachometer based on the red
zone display request signal input from the PCM.
!
Variable red zone has three display patterns that
are switched according to the engine coolant
temperature.
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IG1 B+
1G
1E 1L 1J
1C
PCM
INSTRUMENT CLUSTER
MICROCOMPUTER
TACHOMETER
RED ZONE DISPLAY
DETERMINATION
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VARIABLE RED ZONE
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ENGINE COOLANT
TEMPERATURE
LESS THAN 40
°
C {104
°
F}
ENGINE COOLANT
TEMPERATURE
70
°
C {158
°
F}
OR MORE
ENGINE COOLANT
TEMPERATURE
40 ° C {104 ° F} OR MORE
AND LESS THAN 70
°
C {158
°
F}
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Engine coolant
temperature
Range of variable red zone
5MT, 6AT 6MT
Less than 40
$
C {104
$
F} 5,000 rpm 5,000 rpm
40
$
C {104
$
F} or more and
less than 70
$
C {158
$
F}
6,500 rpm 7,000 rpm
70
$
C {158
$
F} or more 7,500 rpm 9,000 rpm