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Mazda RX-8. Manual - part 19

AUTOMATIC TRANSMISSION [SJ6A-EL]

05–13–35

05–13

AT WARNING LIGHT CONSTRUCTION/OPERATION [SJ6A-EL]

EHU051321101108

•

The AT warning light is built into the instrument cluster.

•

The AT warning light illuminates when the instrument cluster receives a warning signal from the TCM via CAN
communication.

•

The TCM sends a warning signal to the instrument cluster via CAN communication when it detects a
malfunction.

End Of Sie

SELECTOR INDICATOR LIGHT FUNCTION [SJ6A-EL]

EHU051321101109

•

The selector indicator light has a selector lever position light, and a gear position indicator light that indicates
gear position.

•

When downshifting is cancelled in the M range, the gear position indicator light flashes two times to alert the
driver that downshifting is cancelled.

End Of Sie

2GR

3GR

4GR

5GR

2GR

3GR

4GR

5GR

CAN

TCM

INSTRUMENT CLUSTER

AT WARNING LIGHT

1GR

6GR

E5U513ZS5035

AUTOMATIC TRANSMISSION [SJ6A-EL]

05–13–36

SELECTOR INDICATOR LIGHT CONSTRUCTION/OPERATION [SJ6A-EL]

EHU051321101110

Construction

•

The selector indicator light is built into the instrument cluster.

•

When in the P, R, N or D range, the TCM detects the selector lever position based on an analog signal from the
TR switch. When in the M range, the TCM detects the selector lever position based on a signal from the M
range switch inside the selector lever component.

•

When the instrument cluster receives a range signal or a gear position signal from the TCM via CAN
communication, the selector lever position and the gear position indicator lights illuminate or flash accordingly.

Operation
Gear position indicator light flash

•

When the driver’s down-shift operation is cancelled, the gear position indicator light flash twice.

—

When the TCM cancels a shift operation, all of the signals are pulsed ON/OFF and when finally input to the
instrument cluster, the on signal (ex. M1 signal when in 1GR) and the remaining three off signals (M2, M3,
M4, M5, M6) are reversed to off and on signals respectively.

•

Based on a combination of input signals from the TCM, the instrument cluster determines the gear number
(1GR displayed as “1”), and flashes the gear position number in the gear position indicator light and the
selector indicator “M” light.

End Of Sie

P
R
N
D

TCM

INSTRUMENT CLUSTER

SELECTOR
INDICATOR LIGHT

GEAR POSITION INDICATOR LIGHT

ABOVE DIAGRAM SHOWS FLASHING WHEN IN 1GR

CAN

2GR

3GR

4GR

5GR

2GR

3GR

4GR

5GR

1GR

6GR

E5U513ZS5036

AUTOMATIC TRANSMISSION [SJ6A-EL]

05–13–37

05–13

TORQUE CONVERTER CLUTCH (TCC) CONTROL OUTLINE [SJ6A-EL]

EHU051318901109

•

Based on the TCC diagram, the TCC control solenoid is turned on and off according to the vehicle speed and
throttle opening angle, and the TCC point control is performed.

•

If any of the following three conditions are met, TCC is cancelled.

TCC Cancel Conditions

•

Brake switch is ON

•

Accelerator is fully closed (determined being idling)

•

Engine coolant temperature is low

Deceleration Slip Control

•

The deceleration slip control operates when the accelerator pedal is fully depressed at the start of the
deceleration slip range while the vehicle is being driven.

•

The deceleration slip control operates even at lower vehicle speeds by sliding the lockup clutch slightly and
suppressing engine speed increase. In addition, fuel economy has been improved due to the improved
transmission efficiency.

End Of Sie

5-6 SHIFT INHIBIT CONTROL OUTLINE [SJ6A-EL]

EHU051318901110

•

The TCM inhibits shift change from the 5th to 6th gears when it determines that the engine is cold based on the
engine coolant temperature signal from the engine.

End Of Sie

TORQUE REDUCTION CONTROL AND LINE PRESSURE CONTROL OUTLINE [SJ6A-EL]

EHU051318901111

•

While in a shift change between 1st and 6th gears, a torque reduction request signal is output from the TCM to
the PCM to cut engine torque amplification caused by shift changes to realize smooth shift shock.

•

In addition, line pressure control in which line pressure is controlled during shift change between 1st and 6th
gears has been adopted to improve shift shock.

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0/8

1/8

2/8

3/8

4/8

5/8

6/8

7/8

8/8

VEHICLE SPEED km/h {mph}

{0}

{6.2}

{12}

{19}

{25}

{31}

{37}

{43}

{50}

{56}

100

{62}

110

{68}

120

{74}

130

{81}

140

{87}

150

{93}

160

{99}

170

{105}

180

{112}

190

{118}

200

{124}

210

{131}

220

{137}

230

{143}

THR

TTLE OPENING

4GR

5GR

6GR

TCC OPERATION
AVAILABLE

TCC ON

START OF DECELERATION
SLIP RANGE

DECELERATION SLIP
CONTROL OFF

EHU513BS8009

AUTOMATIC TRANSMISSION [SJ6A-EL]

05–13–38

SELF-DIAGNOSIS FUNCTION OUTLINE [SJ6A-EL]

EHU051318901112

•

The TCM monitors the communication status of each sensor, electronic component and PCM including the
PCM. If any malfunction should occur, the TCM functions to warn the driver and stores the malfunction as a
diagnosis code.

Caution

•

To erase stored DTCs, always perform one of the below procedures. If not performed, a miss-
reading of the DTC may occur.

Stored DTC Erasing Method

•

Use the WDS or equivalent.

•

Disconnect the negative battery cable and reconnect it after 5 min. or more.

End Of Sie

FAIL-SAFE OUTLINE [SJ6A-EL]

EHU051318901113

•

With the fail-safe function, if any malfunction should occur in the automatic transmission system, the TCM will
output a control signal, and control will be performed to make travelling a minimum distance possible. If shift
solenoid malfunction, the TCM will cancel the output of control signals to the solenoid.

End Of Sie

SHIFT LEARNING FUNCTION [SJ6A-EL]

EHU051318901114

•

Learns optimum hydraulic pressures for each clutch and brake to reduce shift shock during shift change.

End Of Sie

COOLING SYSTEM OUTLINE [SJ6A-EL]

EHU051319900101

•

A water-cooling type AT oil cooler is adopted and installed in the radiator. The oil cooler cools the ATF heated in
the AT body.

End Of Sie

POWER PLANT FRAME (PPF) FUNCTION [SJ6A-EL]

EHU051300000107

•

The Power Plant Frame feature has been adopted for all models. For detailed information, refer to the 2005MY
RX-8 M15M-D manual transmission description.

End Of Sie

On-board diagnosis

•

If any malfunction should occur in the automatic transmission, the TCM will cause
warning light to light up in order to inform the driver of the malfunction.

Off-board diagnosis

•

The TCM stores the malfunction as a diagnosis code. The diagnosis code and TCM data
can be inspected by connecting the WDS or equivalent.

RADIATOR (IN TANK OIL COOLER)

OUT

EHU513BS8006

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