2002 MAZDA 6 torque

K2–48
AUTOMATIC TRANSAXLE
Function chart
Construction/Operation
Duty type
Normal high
•De-energized (OFF) or duty 0%
—Because the output port (solenoid pressure) and supply port (pilot pressure) connect in the solenoid, the
solenoid pressure supplied to the output port.
•Energized (ON) or duty 100%
—Because the output port (solenoid pressure) and the drain port connect, solenoid pressure is drained.
Normal low
•De-energized (OFF) or duty 0%
—Because the output port (solenoid pressure) and the drain port connect in the solenoid, the solenoid
pressure is drained.
•Energized (ON) or duty 100%
—Because the output port (solenoid pressure) and the supply port (pilot pressure) connect in the solenoid,
the solenoid pressure supplied to the output port.
Solenoid Type Characteristics Function
Pressure control solenoid
Repeats ON and OFF at 50
Hz (20 ms cycle); duty cycle
type (three-way type)Normal highControls pressure regulator
valve, regulates line pressure
Torque converter clutch
(TCC) solenoid valveNormal lowControls TCC engagement
and disengagement
2-4 brake solenoid valve
Normal highControl 2-4 brake
engagement and
disengagement
High clutch solenoid valveControl high clutch
engagement and
disengagement
Shift solenoid A
ON/OFF (three-way type)
Normal lowControl shift valve A
Shift solenoid BControl shift valve B
Shift solenoid CControl shift valve C
Reduction timing solenoid
valve
ON/OFF (two-way type)Control reduction reducing
valve
Neutral shift solenoidControl neutral shift valve and
reverse inhibitor valve
AMU0517S025
AMU0517S026

K2–50
AUTOMATIC TRANSAXLE
CONTROLLER AREA NETWORK (CAN) DESCRIPTIONA6E571418901201Outline
•The TCM transmits/receives information using the CAN system. See Section T for detailed information
regarding the CAN system.
Structure/Operation
•The PCM inputs throttle opening angle, engine speed, engine torque, engine coolant temperature. to the TCM.
•The TCM operates shift and TCC controls based on the throttle opening angle, and controls line pressure and
other based on the throttle opening angle and the engine torque.
•The TCM outputs reduce torque signal, range signal, turbine speed, ATF temperature signal, and TCC signal to
the PCM.
•If there is an open or short circuit in the CAN wiring, the system determines that the CAN is abnormal and
switches to fail-safe mode.
Input
•Throttle position
•Engine torque (without torque down)
•Engine torque (with torque down)
•Engine torque (loss torque)
•Torque reduction request
•ECT
•Engine speed
•Buttery reconnection
Output
•Range position
•Turbine speed
•ATF temperature
•TCC
•Racing select
•Gear position
•Desired torque
•Desired gear position
•Upper torque limit
•Traveled distance
•MIL indicate request
•AT warning light indicate request
End Of Sie

AUTOMATIC TRANSAXLE
K2–55
K2
Construction (System diagram)
.
1T 1Z 1W
1AA
2C 2Y
1S
1H2B 1K
1X
1M
1V
1N
2F
2J
2M
1F
1B
9
8
7
5
4
3
1
2
10
17
15
16
14
13
11
12
6
A6E5714W019
1 Intermediate sensor
2 VSS
3 Input/turbine speed sensor
4 Throttle position signal
5 Engine torque signal
6 TFT sensor
7TCM8TR switch
9 Pressure control solenoid
10 M range switch
11 Up switch
12 Down switch
13 Cruise control module

K2–56
AUTOMATIC TRANSAXLE
Basic Line Pressure Control
•Control at vehicle-start or during normal driving. The pressure control solenoid is controlled so that the line
pressure is optimal according to the throttle opening angle.
The pressure characteristic is as shown in the graph at below. During normal driving (only in shift ranges for
forward travel), the line pressure is set lower than that of at vehicle-start; this is called “cutback.”
•Though the cutback control is selected in each driving pattern, it is not operated in the fail-safe mode. In the fail-
safe mode, the pressure before the cutback is retained and so the pressure is higher than that during normal
driving.
Line Pressure Control When Shifting
•Line pressure is controlled when shifting the transaxle to reduce shift shock. Line pressure is adjusted only
during shifting so that it is optimal at each shifting according to the driving conditions. During the control, engine
output torque is also reduced.
Backup Control
•When shifting down to employ engine braking during high-speed driving, line pressure is gradually increased,
thus increasing clutch capacity.
The backup control is operated regardless of the driving range when the engine brake is operated in 1GR or
when shifting down to 2GR-4GR.
AMU0517S065
AMU0517S032

K2–58
AUTOMATIC TRANSAXLE
Construction (system diagram)
.
1T 1Z 1W
2B
2Y
2V
2U
2P 1K
1X 1M
1V
1N
2F
2J
2M
1F
1B
9
8
7
5
4
3
1
2
10
19
18
17
15
16
14
13
11
12
6
A6E5714W020
1 VSS
2 Input/turbine speed sensor
3 Intermediate sensor
4 Input5 Throttle position signal
Torque reduce signal
Engine torque signal
6Output
7 Reduce torque signal

AUTOMATIC TRANSAXLE
K2–59
K2
Operation
Upshift clutch engagement pressure feedback
•Clutch pressure (2) is learned so that gear shift time (1) becomes a predetermined target value, and thus
changes in performance and changes in the transaxle over time are minimized based on past gear shift results.
Upshift timing feedback (release-side clutch pressure)
•Clutch pressure release timing on the release side (2) is learned so that the change in engine speed (1) is
optimized, and thus clutch pressures on the engagement and release sides are optimized.
End Of SieN-D SELECT CONTROL DESCRIPTIONA6E571418901207•When the selector lever is switched from the P or N position to the driving ranges, or vice versa, the engine
speed change is minimized by regulating fuel injection volume in order to improve select feel.
•Range signals are output to the PCM in the following instances:
When the selector lever is switched from the P or N position to the driving ranges, or vice versa, and the
specified time has elapsed.
•The PCM regulates fuel injection volume based on inhibitor signals prevent change in engine speed.
End Of Sie
TORQUE CONVERTER CLUTCH (TCC) CONTROL DESCRIPTIONA6E571418901208Outline
Features
•The TCM selects the TCC schedule according to the gear selected by the transaxle. 50 Hz (20 ms cycle) on/off
signals are relayed from the TCC schedule and speed sensor and throttle opening angle to the duty cycle TCC
solenoid valve to control TCC.
8PCM
9 TFT sensor
10 TCM
11 TR switch
12 Pressure control solenoid
13 2-4 brake solenoid valve14 High clutch solenoid valve
15 GND return
16 R
17 D
18 N
19 P
AMU0517S038
AMU0517S039

AUTOMATIC TRANSAXLE
K2–61
K2
Operation
Torque converter clutch (TCC) release operation
•The TCM sends an OFF signal to TCC solenoid valve to release the TCC. In this condition, the TCC control
valve is pushed to the up side by spring force and line pressure, and torque converter pressure acts on the
torque converter front chamber, releasing the TCC from the converter cover.
AMU0517S041

K2–62
AUTOMATIC TRANSAXLE
Torque converter clutch (TCC) engaging operation
•The TCM determines smooth TCC operation. It sends an ON signal to the TCC solenoid valve to push the TCC
control valve to the down side. Consequently, the hydraulic pressure applied to the torque converter front
chamber is drained through the TCC control valve, engaging torque converter clutch.
Coast TCC
•Even when the accelerator pedal is released in the TCC range at high speeds, the TCC remains engaged to
prevent repetition of TCC engagement/release by depressing/releasing the accelerator pedal, as well as
reducing shock during the operation.
AMU0517S042