Read A760E and A760F Automatic text version

108

TOYOTA TUNDRA ­ NEW FEATURES

JA760E AND A760F AUTOMATIC TRANSMISSIONS 1. Description

D An A760E 6-speed Super Electronic Controlled Transmission (Super ECT) is used on the 2WD models with 1UR-FE engine. D An A760F 6-speed Super Electronic Controlled Transmission (Super ECT) is used on the 4WD models with 1UR-FE engine. D A tow/haul control is used on the models with towing package. This controls the engine throttle, transmission shift schedule and shift timing to ensure driveability when a trailer is being towed.

12DCH001Y

A760E Automatic Transmission

12DCH002Y

A760F Automatic Transmission

TOYOTA TUNDRA ­ NEW FEATURES

"

109

Specifications A A760E 1UR-FE 1st 2nd 3rd 3.520 2.042 1.400 1.000 0.716 0.586 3.224 Toyota Genuine ATF WS Models without Towing Package Models with Towing Package Models without Towing Package Models with Towing Package 11.1 Liters (11.6 US qts, 9.7 Imp. qts) 11.6 Liters (12.3 US qts, 10.2 Imp. qts) 88.7 kg (195.1 lb) 89.2 kg (196.2 lb) A760F 1UR-FE 1st 2nd 3rd 3.520 2.042 1.400 1.000 0.716 0.586 3.224 Toyota Genuine ATF WS Models without Towing Package Models with Towing Package Models without Towing Package Models with Towing Package 10.8 Liters (11.4 US qts, 9.5 Imp. qts) 11.3 Liters (11.9 US qts, 9.9 Imp. qts) 90.5 kg (199.1 lb) 90.9 kg (200.0 lb)

Transmission Type Engine Type

Gear Ratio

4th 5th 6th Reverse

Fluid Type Fluid Capacity Weight (Reference)* Transmission Type Engine Type

Gear Ratio

4th 5th 6th Reverse

Fluid Type Fluid Capacity Weight (Reference)*

*: Weight shows the figure with the fluid fully filled.

110

TOYOTA TUNDRA ­ NEW FEATURES C3 C1 B3 B1

C2

B2

F3 B4 Rear Planetary Gear

Input Shaft

Center Planetary Gear

C4

"

F4

F2

F1

Front Planetary Gear

12DCH033Y

Specifications A Item C1 C2 C3 C4 B1 B2 B3 B4 F1 F2 F3 F4 No. 1 Clutch No. 2 Clutch No. 3 Clutch No. 4 Clutch No. 1 Brake No. 2 Brake No. 3 Brake No. 4 Brake No. 1 1-way Clutch No. 2 1-way Clutch No. 3 1-way Clutch No. 4 1-way Clutch No. of Sun Gear Teeth Inner Outer No. of Sprags No. of Discs A760E 5 6 5 3 4 4 4 8 18 25 26 27 40 22 21 91 31 23 77 25 19 63 A760F z z z z z z z z z z z z z z z z z z z z z z

Front Planetary Gear

No. of Pinion Gear Teeth No. of Ring Gear Teeth No. of Sun Gear Teeth

Center Planetary Gear

No. of Pinion Gear Teeth No. of Ring Gear Teeth No. of Sun Gear Teeth

Rear Planetary Gear

No. of Pinion Gear Teeth No. of Ring Gear Teeth

TOYOTA TUNDRA ­ NEW FEATURES

111

2. Torque Converter

A compact, lightweight and high-capacity torque converter is used. The torque converter supports flex lock-up clutch control, thus allowing for improved fuel economy. Pump Impeller Lock-up Clutch

1-way Clutch

Stator Turbine Runner

12DCH003Y

"

Specifications A A760E 3-element, 1-step, 2-phase (with Lock-up Mechanism) 1.80 A760F z z

Transmission Type Torque Converter Type Stall Torque Ratio

3. Oil Pump

D The oil pump is driven by the torque converter. It lubricates the planetary gear units and supplies operating fluid pressure for hydraulic control. D The pump cover is made of aluminum to reduce weight. Pump Cover

Driven Gear Pump Body

Stator Shaft Drive Gear

232CH89

112

TOYOTA TUNDRA ­ NEW FEATURES

4. Oil Strainer

A felt type oil strainer (in a plastic case) is used because it weighs less, offers excellent debris capturing ability, and is more reliable. This oil strainer is maintenance-free.

12DCH046I

Plastic Case

Felt Strainer

Oil Pan

TOYOTA TUNDRA ­ NEW FEATURES

113

5. ATF Cooling System

General D These automatic transmissions use an ATF warmer that increases the rate at which the ATF warms up, and an ATF cooler that cools down the ATF. D The ATF warmer is provided as standard. D An air-cooled type ATF cooler integrated with the condenser is provided on the models with towing package.

"

Models without ATF Cooler A Engine

Automatic Transmission Heater Core

: ATF flow : Engine coolant flow

ATF Warmer

"

12DCH004I

Models with ATF Cooler A Engine

Automatic Transmission Heater Core

: ATF flow : Engine coolant flow

ATF Cooler Portion

Condenser Assembly

Condenser Portion ATF Warmer Transmission Oil Thermostat

12DCH005I

114 ATF Warmer

TOYOTA TUNDRA ­ NEW FEATURES

D The ATF warmer uses engine coolant to warm up the ATF quickly and keep the ATF temperature higher (within limits). Consequently, the friction losses of the automatic transmission are quickly reduced, thus improving fuel economy. D Models with an ATF cooler have a transmission oil thermostat to switch the ATF passages.

To Engine : Engine coolant flow : ATF flow From Engine

To Automatic Transmission ATF Warmer

From Automatic Transmission

Models without ATF Cooler

12DCH006Y

To Engine From Engine

ATF Warmer

To Automatic Transmission

From Automatic Transmission Transmission Oil Thermostat ATF Warmer From ATF Cooler Models with ATF Cooler

12DCH007Y

To ATF Cooler

TOYOTA TUNDRA ­ NEW FEATURES Transmission Oil Thermostat (Models with Towing Package)

115

The transmission oil thermostat consists of the poppet valve, bypass valve and element case (contains wax). When the ATF temperature changes from low to high, the wax will expand to start to open the poppet valve and close the bypass valve, thus switching the ATF passages. To Automatic Transmission

Element Case (Contains Wax)

From ATF Cooler Poppet Valve (Closed) Poppet Valve (Open)

From Automatic Transmission Bypass Valve (Open)

To ATF Cooler Bypass Valve (Closed) ATF Temperature High Condition

12DCH008I

ATF Temperature Low Condition

ATF Cooler (Models with Towing Package) The air-cooled type ATF cooler integrated with the condenser is used to maintain ATF cooling performance under high loads.

ATF Cooler Portion

Condenser Portion Condenser Assembly

12DCH009Y

116

TOYOTA TUNDRA ­ NEW FEATURES

6. ATF Filling Procedure

An ATF filling procedure is used in order to improve the accuracy of the ATF level when the transmission is being repaired or replaced. As a result, the oil filler tube and the oil level gauge used in the conventional automatic transmission have been discontinued, eliminating the need to inspect the fluid level as a part of routine maintenance. D This filling procedure uses a refill plug, an overflow plug, an ATF temperature sensor No. 2, and a D indicator. Refill Plug

Proper Level Overflow Plug Service Tip For details about the ATF filling procedures, refer to the 2010 TOYOTA TUNDRA Repair Manual.

12DCH035Y

TOYOTA TUNDRA ­ NEW FEATURES

117

7. Planetary Gear Unit

Construction The planetary gear unit consists of 3 planetary gear units, 4 clutches, 4 brakes, and 4 1-way clutches. D A centrifugal fluid pressure canceling mechanism is used in the C1, C2, C3, and C4 clutches applied when shifting 2nd ! 3rd, 3rd ! 4th, 4th ! 5th, and 5th ! 6th. For details, see page 124. No. 1 Clutch (C1) No. 1 Brake (B1)

No. 3 Clutch (C3) No. 2 Clutch (C2)

No. 3 Brake (B3)

No. 4 Brake (B4) No. 2 Brake (B2) Rear Planetary Gear

Output Shaft Input Shaft No. 3 1-way Clutch (F3) Center Planetary Gear No. 1 1-way No. 4 Clutch (C4) Intermediate Shaft Clutch (F1) No. 4 1-way Clutch (F4) Front Planetary Gear No. 2 1-way Clutch (F2) 12DCH036Y

B3 F2 C3 C2 C1 C4 F4 F1 B1 B2 F3 B4

Output Shaft

Input Shaft

Sun Gear

Front Planetary Gear Center Planetary Gear

Intermediate Shaft Rear Planetary Gear

12DCH010Y

118 Function of Components Component C1 C2 C3 C4 B1 B2 B3 B4 F1 F2 F3 F4 No. 1 Clutch No. 2 Clutch No. 3 Clutch No. 4 Clutch No. 1 Brake No. 2 Brake No. 3 Brake No. 4 Brake

TOYOTA TUNDRA ­ NEW FEATURES

Function Connects the input shaft, F4 and intermediate shaft. Connects the input shaft and center planetary carrier. Connects the input shaft and sun gear. Connects the input shaft and intermediate shaft. Prevents the front planetary carrier from turning either clockwise or counterclockwise. Prevents the front and the center ring gears from turning either clockwise or counterclockwise. Prevents the outer race of F2 from turning either clockwise or counterclockwise. Prevents the center planetary carrier and rear ring gear from turning either clockwise or counterclockwise. Prevents the front planetary carrier from turning counterclockwise. When B3 is operating, the 1-way clutch prevents the front sun gear from turning counterclockwise. Prevents the center planetary carrier and rear ring gear from turning counterclockwise. Prevents the intermediate shaft from turning counterclockwise. These gears change the route through which driving force is transmitted, in accordance with the operation of each clutch and brake, in order to increase or reduce the output shaft speed.

No. 1 1-way Clutch No. 2 1-way Clutch No. 3 1-way Clutch No. 4 1-way Clutch

Planetary Gear

TOYOTA TUNDRA ­ NEW FEATURES Transmission Power Flow

Shift Position or Shift Range P R* N 1st 2nd D, S6 3rd 4th* 5th* 6th* 1st 2nd S5 3rd 4th* 5th* 1st S4 2nd 3rd 4th* 1st S3 2nd 3rd* S2 S1 1st 2nd* 1st* On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On Shift Solenoid Valve S1 S2 S3 S4 SR SL1 On On On On On On On On On On On On On On On On On SL2 SLU C1 On On On On On On On On On On On On f f f f F F f f f f F f f f f f f f f f f n n n f n f f f f n n f F f f f f f f F n f F F f f f f f f f F f n f f F F F f f f f f f f f F f n f F f f F F F F f f f f f f n f f Clutch C2 C3 C4 B1 Brake B2 B3 B4

119

1-way Clutch F1 F2 F3 F4

On On On On On On On On On On On On

f f f f

f f f f f f f f f f f f f f

On On On On On

f: Operates F: Operates but is not related to power transmission n: Operates during engine braking *: Engine braking occurs

120

TOYOTA TUNDRA ­ NEW FEATURES 1) 1st Gear (Shift Lever is in D or S)

B3 F2 C3 C2 C1 C4 F4 F1 B1 B2 F3 B4

: Operates : Operates during engine braking C1 f C2 C3 C4 n B1 B2 B3 B4 n F1 F2 F3 f

12DCH011Y

F4 f

f: Operates n: Operates during engine braking (S1 range) 2) 2nd Gear (Shift Lever is in D or S)

B3 F2 C3 C2 C1 C4 F4 F1 B1 B2 F3 B4

: Operates : Operates during engine braking C1 f C2 C3 C4 n B1 B2 n B3 f B4 F1 f F2 f

12DCH012Y

F3

F4 f

f: Operates n: Operates during engine braking (S2 range)

TOYOTA TUNDRA ­ NEW FEATURES 3) 3rd Gear (Shift Lever is in D or S)

121

B3 F2 C3 C2 C1 C4 F4 F1 B1 B2 F3 B4

: Operates : Operates during engine braking : Operates but is not related to power transmission

12DCH013Y

C1 f

C2

C3 f

C4 n

B1 n

B2

B3 F

B4

F1 f

F2

F3

F4 f

f: Operates n: Operates during engine braking (S3 range) F: Operates but is not related to power transmission 4) 4th Gear (Shift Lever is in D or S)

B3 F2 C3 C2 C1 C3 F4 F1 B1 B2 F3 B4

: Operates : Operates during engine braking : Operates but is not related to power transmission C1 f C2 f C3 F C4 n B1 B2 B3 F B4 F1 F2 F3

12DCH014Y

F4 f

f: Operates n: Operates during engine braking F: Operates but is not related to power transmission

122

TOYOTA TUNDRA ­ NEW FEATURES 5) 5th Gear (Shift Lever is in D or S)

B3 F2 C3 C2 C1 C4 F4 F1 B1 B2 F3 B4

: Operates : Operates but is not related to power transmission C1 F C2 f C3 f C4 B1 f B2 B3 F B4 F1 F2 F3

12DCH015Y

F4

f: Operates F: Operates but is not related to power transmission 6) 6th Gear (Shift Lever is in D or S)

B3 F2 C3 C2 C1 C4 F4 F1 B1 B2 F3 B4

: Operates : Operates but is not related to power transmission C1 F C2 f C3 C4 B1 F B2 f B3 F B4 F1 F2 F3

12DCH016Y

F4

f: Operates F: Operates but is not related to power transmission

TOYOTA TUNDRA ­ NEW FEATURES 7) Reverse Gear (Shift Lever is in R)

123

B3 F2 C3 C2 C1 C4 F4 F1 B1 B2 F3 B4

: Operates : Operates during engine braking

12DCH017Y

C1

C2

C3 f

C4

B1 n

B2

B3

B4 f

F1 f

F2

F3

F4

f: Operates n: Operates during engine braking

124

TOYOTA TUNDRA ­ NEW FEATURES

Centrifugal Fluid Pressure Canceling Mechanism For the following reason, the centrifugal fluid pressure canceling mechanism is used on the C1, C2, C3, and C4 clutches. D Clutch shifting operation is affected not only by the valve body controlling fluid pressure but also by centrifugal fluid pressure that is present due to fluid in the clutch piston oil pressure chamber. The centrifugal fluid pressure canceling mechanism has chamber B to reduce the effect applied to the chamber A. As a result, smooth shifting with excellent response has been achieved.

No. 4 Clutch (C4) Piston

Chamber A (for C1) Chamber A (for C4)

No. 1 Clutch (C1)

Chamber B

12DCH018Y

Chamber A (Piston Fluid Pressure)

Piston

Clutch

: Target fluid pressure : Centrifugal fluid pressure applied to chamber A : Centrifugal fluid pressure applied to chamber B

Chamber B (Canceling Fluid Pressure) Fluid Pressure Applied to Piston Shaft Side

12ECH003I

Fluid pressure applied to piston

­

Centrifugal fluid pressure applied to chamber B

=

Target fluid pressure (original clutch pressure)

TOYOTA TUNDRA ­ NEW FEATURES

125

8. Valve Body Unit

General The valve body consists of the upper (No. 1 and No. 2) and lower (No. 1 and No. 2) valve bodies and 9 shift solenoid valves. Shift Solenoid Valve S1 Shift Solenoid Valve SR Shift Solenoid Valve SL1 Shift Solenoid Valve S4 Shift Solenoid Valve S2 Shift Solenoid Valve S3 No. 2 Upper Valve Body No. 1 Upper Valve Body

Shift Solenoid Valve SLT No. 1 Lower Valve Body Shift Solenoid Valve SLU No. 2 Lower Valve Body Shift Solenoid Valve SL2

"

259LSK76

No. 1 Upper Valve Body A Clutch Control Valve Clutch Apply Relay Valve C1 Accumulator Reverse Sequence Valve 2 ­ 3 Shift Valve (Also Works as 5 ­ 6 Shift Valve)

B2 Accumulator

Secondary Regulator Valve

259LSK74

Lock-up Relay Valve Lock-up Control Valve C3 Check Valve

3 ­ 4 Shift Valve B4 Outer Check Valve 1 ­ 2 Shift Valve

126

"

TOYOTA TUNDRA ­ NEW FEATURES No. 2 Upper Valve Body A

C3 Apply Relay Valve

259LSK72

"

No. 1 Lower Valve Body A 4 ­ 5 Shift Valve

SLT Damper

Primary Regulator Valve

"

259LSK73

No. 2 Lower Valve Body A

SL1 Relay Valve

Brake Control Valve

Solenoid Modulator Valve B1 Apply Relay Valve

Accumulator Control Valve

259LSK75

TOYOTA TUNDRA ­ NEW FEATURES Shift Solenoid Valve 1) Shift Solenoid Valves S1, S2, S3, S4 and SR D These shift solenoid valves are 3-way solenoid valves.

127

D A filter is provided at the tip of the shift solenoid valve to further improve operational reliability.

Control Pressure Line Pressure Filter Line Pressure

Control Pressure

Drain Shift Solenoid Valve Off (S1, S2, S3 and SR) Shift Solenoid Valve On (S1, S2, S3 and SR)

040SC10C

Control Pressure

Control Pressure

Line Pressure Filter Drain

Line Pressure

040SC11C

Shift Solenoid Valve Off (S4)

Shift Solenoid Valve On (S4)

"

Function of Shift Solenoid Valves S1, S2, S3, S4 and SR A Shift Solenoid Valve S1 S2 S3 S4 SR Type 3-way 3-way 3-way 3-way 3-way Function D Switches the 1 ­ 2 shift valve. D Switches the SL1 relay valve. D Switches the 2 ­ 3 shift valve. D Switches the 5 ­ 6 shift valve. Switches the 3 ­ 4 shift valve. D Switches the 4 ­ 5 shift valve. D Switches the SL1 relay valve. D Switches the reverse sequence valve. D Switches the clutch apply relay valve. D Switches the B1 apply relay valve.

128

TOYOTA TUNDRA ­ NEW FEATURES 2) Shift Solenoid Valves SL1, SL2, SLT and SLU These shift solenoid valves are used by the ECM to control hydraulic pressures in a linear fashion based on the current that the ECM causes to flow through their solenoid coils. They control line, clutch, and brake engagement pressure based on the signals received from the ECM. Spool Valve Solenoid Coil

Sleeve Shift Solenoid Valves SL1 and SL2

Hydraulic Pressure

Current Output Characteristics of SL1, SL2 and SLT

Shift Solenoid Valve SLT

Hydraulic Pressure

Shift Solenoid Valve SLU Current Output Characteristics of SLU

259LSK16

"

Function of Shift Solenoid Valves SL1, SL2, SLT and SLU A Shift Solenoid Valve SL1 SL2 SLT SLU Function D Clutch pressure control D Accumulator back pressure control Brake pressure control D Line pressure control D Accumulator back pressure control Lock-up clutch pressure control

TOYOTA TUNDRA ­ NEW FEATURES

129

9. Electronic Control System

General The electronic control system of the A760E and A760F automatic transmissions consists of the control functions listed below: Control Shift Timing Control Function The ECM sends current to shift solenoid valves S1, S2, S3, S4 and/or SR based on signals from various sensors, in order to shift the gears. D Controls the pressure applied directly to B2 brake and C3 clutch by actuating the shift solenoid valves SL1 and SL2 in accordance with the ECM signals. D The shift solenoid valves SLT and SL1 minutely control the clutch pressure in accordance with the engine output and driving conditions. Actuates the shift solenoid valve SLT to control the line pressure in accordance with information from the ECM and the operating conditions of the transmission. Retards the engine ignition timing temporarily to improve shift feeling while upshifting or downshifting occurs. The ECM sends current to the shift solenoid valve SLU based on signals from various sensors and engages or disengages the lock-up clutch. Controls the shift solenoid valve SLU, provides an intermediate mode for when the lock-up clutch is between on and off, and increases the operating range of the lock-up clutch to improve fuel economy. Controls both the shift control and engine output control in an integrated way, achieving excellent shift characteristics and driveability. To prevent engine speed from decreasing and thus maintain the fuel cut, the ECM performs downshifting before the fuel cut ends. To ensure driveability when a trailer is towed, the ECM controls the engine output, transmission shift schedule and shift timing. Based on the signals from various sensors, the ECM determines the road conditions and the intention of the driver. Thus, an appropriate shift pattern is automatically determined, thus improving driveability. The ECM appropriately controls the automatic transmission in accordance with the range position selected while the shift lever is in S. When the ECM detects a malfunction, the ECM records the malfunction and memorizes the information that relates to the fault. If a malfunction is detected in the sensors or solenoids, the ECM effects fail-safe control to prevent the vehicle's driveability from being affected significantly.

Clutch Pressure Control (See page 137)

Line Pressure Optimal Control (See page 138) Engine Torque Control Lock-up Timing Control (See page 139) Flex Lock-up Clutch Control (See page 140) Powertrain Cooperative Control (See page 142) Coast Downshift Control (See page 143) Tow/Haul Control* (See page 144) Artificial Intelligence-shift (AI-shift) Control (See page 147) Multi-mode Automatic Transmission (See page 150) Diagnosis (See page 153) Fail-safe (See page 153) *: Models with towing package

130 Construction

TOYOTA TUNDRA ­ NEW FEATURES

The configurations of the electronic control system for the A760E and A760F automatic transmissions are as shown in the following chart:

MASS AIR FLOW METER

SHIFT SOLENOID VALVE S1 SHIFT SOLENOID VALVE S2

CRANKSHAFT POSITION SENSOR

SHIFT SOLENOID VALVE S3 SHIFT SOLENOID VALVE S4

THROTTLE POSITION SENSOR

SHIFT SOLENOID VALVE SR SHIFT SOLENOID VALVE SL1

ACCELERATOR PEDAL POSITION SENSOR

SHIFT SOLENOID VALVE SL2 SHIFT SOLENOID VALVE SLT

ENGINE COOLANT TEMPERATURE SENSOR

ECM SHIFT SOLENOID VALVE SLU ESA

ATF TEMPERATURE SENSOR NO. 1

IGNITION COIL with IGNITER NO. 1, 4, 6, 7 SPARK PLUGS NO. 1, 4, 6, 7

ATF TEMPERATURE SENSOR NO. 2

PARK/NEUTRAL POSITION SWITCH

ESA IGNITION COIL with IGNITER NO. 2, 3, 5, 8

TRANSMISSION CONTROL SWITCH

SPARK PLUGS NO. 2, 3, 5, 8

12DCH019I

(Continued)

TOYOTA TUNDRA ­ NEW FEATURES

131

COMBINATION METER INPUT SPEED SENSOR Vehicle Speed Signal MIL OUTPUT SPEED SENSOR ATF TEMPERATURE WARNING LIGHT SHIFT POSITION INDICATOR LIGHT ECM SHIFT RANGE INDICATOR S MODE INDICATOR LIGHT ATF TEMPERATURE GAUGE*2 TOW/HAUL INDICATOR LIGHT*2 CAN (V Bus) DLC3

12DCH020I

STOP LIGHT SWITCH

4WD CONTROL ECU*1

TRANSFER NEUTRAL POSITION SWITCH*1

TOW/HAUL PATTERN SELECT SWITCH*2

*1: 4WD models *2: Models with towing package

132

TOYOTA TUNDRA ­ NEW FEATURES

Layout of Main Components

ECM

Shift Solenoid Valve S1 Shift Solenoid Valve SR Shift Solenoid Valve SL1 Shift Solenoid Valve SLT

Shift Solenoid Valve S4 Shift Solenoid Valve S2 Shift Solenoid Valve S3

Shift Solenoid Valve SLU Shift Solenoid Valve SL2

ATF Temperature Sensor No. 1

Input Speed Sensor ATF Temperature Sensor No. 2

Park/Neutral Position Switch Output Speed Sensor

12DCH021Y

TOYOTA TUNDRA ­ NEW FEATURES

133

MIL Shift Position Indicator Light ATF Temperature Warning Light

S Mode Indicator Light ATF Temperature Gauge* Shift Range Indicator

TOW/HAUL Indicator Light* Shift Lever Assembly (Column Shift) D Transmission Control Switch D TOW/HAUL Pattern Select Switch*

TOW/ HAUL Pattern Select Switch*

DLC3 Stop Light Switch Accelerator Pedal Position Switch *: Models with towing package Shift Lever Assembly (Floor Shift) D Transmission Control Switch D Shift Lock ECU

12DCH022Y

134

TOYOTA TUNDRA ­ NEW FEATURES

Construction and Operation of Main Components 1) ATF Temperature Sensors No. 1 and No. 2 D The ATF temperature sensor No. 1 (THO1) is used for hydraulic pressure control. This sensor is used for revision of the pressure that is used to apply clutches and brakes in the transmission. This helps to ensure smooth shift quality. D The ATF temperature sensor No. 2 (THO2) is used as a basis for modifying the ECT shift timing control when the ATF temperature is high. It is also used for the ATF temperature warning light. ATF Temperature Sensor No. 1 (THO1)

Front

ATF Temperature Sensor No. 2 (THO2) 2) Input Speed Sensor and Output Speed Sensor

12DCH023Y

The A760E and A760F automatic transmissions use an input speed sensor (for NT signal) and an output speed sensor (for SP2 signal). Thus, the ECM can detect the timing of the shifting of the gears and appropriately control the engine torque and hydraulic pressure in response to various conditions. These speed sensors are the pick-up coil type. D The input speed sensor detects the input speed of the transmission. The No. 3 clutch (C3) drum is used as the timing rotor for this sensor. D The output speed sensor detects the speed of the output shaft. The parking gear on the rear planetary gear is used as the timing rotor for this sensor. No. 3 Clutch (C3) Drum Output Speed Sensor (SP2)

Parking Gear (Timing Rotor)

Input Speed Sensor (NT)

12DCH037Y

TOYOTA TUNDRA ­ NEW FEATURES 3) Park/Neutral Position Switch

135

The park/neutral position switch sends the P, R, N, D and NSW position signals to the ECM. It also sends signals for the shift position indicator light (P, R, N, and D).

"

Wiring Diagram A

ECM To Starter Relay +B B PL RL NL DL P Park/Neutral Position Switch R N D Combination Meter

04E0CH40C

NSW

P

R

N

D

4) Transmission Control Switch D The transmission control switch is installed inside the shift lever assembly to detect the shift lever position and to inform the ECM. The ECM turns on the shift position indicator light and S mode indicator light. D The transmission control switch detects whether the shift lever is in D or S, detects the operating conditions of the shift lever ("+" or "­") if S mode is selected, and sends signals to the ECM. At this time, the ECM turns on the shift range indicator for the selected range.

Transmission Control Switch To IG No. 1 IG Relay S SFTU SFTD E CAN (V Bus) Combination Meter S Mode Indicator Light Shift Range Indicator

12DCH024I

ECM

136

TOYOTA TUNDRA ­ NEW FEATURES 5) TOW/HAUL Pattern Select Switch (Models with Towing Package) D If the shift lever is in D when the switch is pushed once, the tow/haul control will be performed. At this time, the TOW/HAUL indicator light illuminates to inform the driver of the tow/haul control mode. D If the TOW/HAUL pattern select switch is operated again, or the ignition switch is turned off, the tow/haul control will be canceled.

TOW/HAUL Pattern Select Switch (Column Shift)

TOW/HAUL Pattern Select Switch (Floor Shift)

12DCH025Y

TOYOTA TUNDRA ­ NEW FEATURES Clutch Pressure Control 1) Clutch to Clutch Pressure Control

137

This control is used for shifting from 5th to 6th gear and from 6th to 5th gear. The ECM actuates shift solenoid valves SL1 and SL2 in accordance with various signals. The output from these shift solenoid valves acts directly on control valves B2 and C3 in order to regulate the line pressure that acts on the No. 2 brake (B2) and No. 3 clutch (C3). As a result, high response and excellent shift characteristics have been achieved. ECM SL1 Clutch Control Valve C3 SL2 Brake Control Valve B2

D D D D D D Input Speed Sensor Output Speed Sensor Throttle Position Sensor Mass Air Flow Meter ATF Temperature Sensor Engine Coolant Temperature Sensor D Accelerator Pedal Position Sensor

5th ! 6th 6th ! 5th

C3 Off On

B2 On Off

12DCH026I

2) Clutch Pressure Optimal Control The ECM monitors the signals from various types of sensors, such as the input speed sensor, allowing shift solenoid valves SLT, SL1 and SL2 to minutely control the clutch pressure in accordance with engine output and driving conditions. As a result, smooth shift characteristics are achieved. Target rpm Change Ratio ECM

Practical rpm Change Ratio

Input Shaft rpm

Time

Input Speed Sensor

Output Speed Sensor Output Shaft Torque

Accumulator Control Valve Shift Solenoid Valves SLT, SL1, SL2 Clutch and Brake Pressure

Time

ATF Temperature Sensor No. 1

Solenoid Drive Signal

12DCH027I

138

TOYOTA TUNDRA ­ NEW FEATURES

Line Pressure Optimal Control Through the use of the shift solenoid valve SLT, the line pressure is optimally controlled in accordance with the engine torque information, as well as with the internal operating conditions of the torque converter clutch and the transmission. Accordingly, the line pressure can be controlled minutely in accordance with the engine output, traveling condition, and ATF temperature, thus achieving smooth shift characteristics and optimizing the workload of the oil pump (reducing unnecessary parasitic losses).

Line Pressure ECM Primary Regulator Valve

Throttle Valve Opening Intake Air Volume Engine Coolant Temperature Engine Speed Input Speed ATF Temperature Shift Position Solenoid Drive Signal

Throttle Pressure

Pump

Shift Solenoid Valve SLT Fluid Pressure Current

12DCH028I

TOYOTA TUNDRA ­ NEW FEATURES Lock-up Timing Control

139

The ECM operates the lock-up timing control in order to improve the fuel consumption performance while in top gear with the shift lever in the S4 or S5 range, and in 5th or 6th gear with the shift lever in the S6 range or D.

Large

: 5th lock-up operating range : 6th lock-up operating range

Throttle Opening Angle

High Vehicle Speed Lock-up Timing in S6 Range or D

"

12DCH027I

Lock-up Operation Gears in Each Range A f: Available ×: Not available --: Not applicable D, S6 × × × ×* f f S5 × × × ×* f -- S4 × × × f -- --

Shift Position or Shift Range 1st 2nd Gear 3rd 4th 5th 6th

*: Lock-up operation is performed when the 4th gear is held during the AI-shift control or the cruise control.

140

TOYOTA TUNDRA ­ NEW FEATURES

Flex Lock-up Clutch Control In the low-to-mid-speed range, the flex lock-up clutch control regulates the shift solenoid valve SLU to provide an intermediate mode between the on and off operation of the lock-up clutch in order to improve energy transmitting efficiency. As a result, the operating range of the lock-up clutch has been increased and fuel economy has been improved. The flex lock-up clutch control operates in the 3rd, 4th, 5th and 6th gears in D and S6 range, in the 3rd, 4th and 5th gears in the S5 range, and in the 3rd and 4th gears in the S4 range. D Even when the vehicle is decelerating (the accelerator pedal is released), the flex lock-up clutch control operates. Therefore, the fuel cut area of the engine has been expanded and fuel economy has been improved.

ECM

Engine Speed

Engine Coolant Temperature Signal Throttle Position Signal Throttle Position Sensor Engine Speed Signal

Input Speed Sensor

Engine Speed Signal Input Turbine Speed Signal Vehicle Speed

Current Linear Solenoid Signal Time Solenoid Drive Signal

Engine Coolant Temperature Sensor

ATF Temp. Signal Lock-up Control Valve Shift Solenoid Valve SLU

12DCH030I

ATF Temperature Sensor No. 1

TOYOTA TUNDRA ­ NEW FEATURES

141

Large

: Lock-up operating range : Flex lock-up operating range (acceleration) : Flex lock-up operating range (deceleration)

Throttle Opening Angle

Vehicle Speed Flex Lock-up Timing in 6th Gear

High

08FCH013Y

"

Flex Lock-up Operation Gears in Each Range A f: Available ×: Not available --: Not applicable D, S6 × × f*1 f f f*2 S5 × × f*1 f f -- S4 × × f*1 f -- --

Shift Position or Shift Range 1st 2nd Gear 3rd 4th 5th 6th

*1: Only flex lock-up operates when the vehicle is accelerating *2: Only flex lock-up operates when the vehicle is decelerating

142

TOYOTA TUNDRA ­ NEW FEATURES

Powertrain Cooperative Control Through cooperative control with Electronic Throttle Control System-intelligent (ETCS-i) and Electronic Spark Advance (ESA), and electronic control of the engagement and release speed of the clutch and brake hydraulic pressures, excellent response and shift shock reduction have been achieved.

Driver's desired drive force

ECM Shift Solenoid Valve Control Signal ETCS-i Control ESA Control Optimal clutch engagement hydraulic pressure and timing

Shift Solenoid Valve (SL1, SL2)

Optimal engine output

Driver's desired drive force is achieved

04E1CH08C

TOYOTA TUNDRA ­ NEW FEATURES Coast Downshift Control

143

As a result of coast downshift control, downshifting is performed to maintain sufficient engine speed to avoid ending fuel cut control. Thus, fuel cut time is extended and fuel economy is achieved. D In this control, the transmission downshifts from 6th to 5th and then 5th to 4th before fuel cut control ends when the vehicle is decelerated in the 6th gear, so that fuel cut control can continue to operate. Coast down point is raised

Engine Speed

6th

: With coast downshift control : Without coast downshift control

5th 4th Fuel Cut Control On Fuel Cut Control Off Time Keeping Fuel Cut Time

Time limit is expanded

11YCH041Y

6th

5th 4th

144

TOYOTA TUNDRA ­ NEW FEATURES

Tow/Haul Control (Models with Towing Package) 1) General During tow/haul control, the ECM controls the engine output, transmission shift schedule and shift timing to ensure driveability when a trailer is towed. The tow/haul control includes a throttle control, a shift schedule control, a wide open throttle shift timing control and an AI-shift control. D The tow/haul control operates when the TOW/HAUL pattern select switch is turned on. D The TOW/HAUL indicator light is used to inform the driver that tow/haul control is operating. Combination Meter TOW/HAUL Indicator Light CAN (V Bus) Accelerator Pedal Position Signal

ECM TOW/HAUL Pattern Select Switch Signal

D Throttle Position Sensor Signal D Throttle Control Signal Input Speed Sensor Signal

Throttle Body

Output Speed Sensor Signal

Input Speed Sensor Output Speed Sensor Shift Solenoid Valve Control Signal Fluid Pressure Control Signal 2) Throttle Control Throttle control changes the relationship between the accelerator pedal depression angle and the throttle valve opening angle. D During tow/haul control, the throttle valve opening is increased by throttle control. As a result, acceleration performance is ensured. Wide Control

12DCH031I

Throttle Valve Opening Angle

No Control

Accelerator Pedal Depression Angle

04E1CH32C

TOYOTA TUNDRA ­ NEW FEATURES 3) Shift Schedule Control The shift schedule control changes the upshift and downshift schedules during tow/haul control.

145

D Compared to normal mode, in the upshift schedule of tow/haul control, the shift pattern is moved toward higher vehicle speeds and the low gear usage area is enlarged, thus ensuring driveability. : Tow/haul control off Wide : Tow/haul control on

Throttle Valve Opening Angle

Vehicle Speed Upshift Schedule

High

12DCH047I

D Compared to normal mode, in the downshift schedule of tow/haul control, the shift pattern is moved toward narrower throttle valve opening angles and the low gear usage area is enlarged, thus ensuring towing force.

: Tow/haul control off Wide : Tow/haul control on

Throttle Valve Opening Angle

Vehicle Speed Downshift Schedule

High

12DCH048I

146

TOYOTA TUNDRA ­ NEW FEATURES 4) Wide Open Throttle Shift Timing Control Due to wide open throttle shift timing control, upshift timing is delayed to make use of high engine power when the accelerator pedal is fully open. D Wide open throttle shift timing control operates in the 1st, 2nd and 3rd gears during tow/haul control.

Upshift Instruction (Tow/Haul Control Off) High Shift Timing (A) Engine Speed

Upshift Instruction (Tow/Haul Control On)

Maximum Engine Speed

High Shift Timing (B) Engine Speed

Maximum Engine Speed

High Shift Timing (C) Engine Speed Upshift Timing Change

Maximum Engine Speed

04E1CH33C

Shift Timing (A) (B) (C)

Towing Without With With

Tow/Haul Control Off Off On

TOYOTA TUNDRA ­ NEW FEATURES Artificial Intelligence-shift (AI-shift) Control 1) General

147

D The AI-shift control determines optimal transmission control based on input signals and automatically changes the shift pattern. As a result, a high caliber of transmission operation is achieved. D The AI-shift control includes a road condition support control and a driver's intention support control. D The AI-shift control is effected only with the shift lever in D, based on the accelerator pedal and brake operation data. The AI-shift control will be canceled when the driver selects the S mode.

Input Signals Sensor Signal D Throttle Valve Opening Angle D Vehicle Speed D Engine Speed D Brake Signal AI-shift Road Condition Uphill/Downhill Driving Estimating Grade Small : Criterion acceleration : Actual acceleration Large

Basic Shift Pattern Control

Road Condition Support Control

Calculated by ECM Vehicle Acceleration

Driver's Intention D Acceleration Pedal Operation D Vehicle Condition Estimating Driver's Intention Driver's Intention Support Control

Switch Signal

TOW/HAUL Pattern Select Switch

04E1CH34C

148

TOYOTA TUNDRA ­ NEW FEATURES 2) Road Condition Support Control Under road condition support control, the ECM identifies the throttle valve opening angle and the vehicle speed to determine whether the vehicle is being driven uphill or downhill. a. When a trailer is not being towed D To achieve an optimal drive force while driving uphill, this control prevents the transmission from upshifting to 4th, 5th or 6th gear. D To achieve an optimal engine braking effect while driving downhill, this control automatically downshifts the transmission to 5th, 4th or 3rd gear.

6th 6th

4th 4th

5th 3rd 5th 3rd

5th 4th (Driver needs to apply brakes) 4th

3rd

6th Without Control With Control 5th 6th

04E1CH31C

4th

TOYOTA TUNDRA ­ NEW FEATURES b. When a trailer is being towed

149

D To achieve an optimal drive force while driving uphill, this control prevents the transmission from upshifting. D To achieve an optimal engine braking effect while driving downhill, this control automatically downshifts the transmission. D In addition to the shift pattern changes caused by the road condition support control, the shift pattern is further changed when the tow/haul control is turned on.

6th

5th

4th

2nd $ 3rd

5th

4t h

5th

6th

Tow/Haul Control: Off Tow/Haul Control: On

04E1CH09C

5th

4th

3rd 2nd

4th

3rd

4th

5th

3) Driver's Intention Support Control a. When a trailer is not being towed The driver's intention support control estimates the driver's intention based on the accelerator pedal operation and vehicle condition, and selects a shift pattern that is well-suited to the driver. b. When a trailer is being towed While the vehicle is being driven with the shift lever in D, the driver's intention support control ensures driveability while towing a trailer by determining the driver's intention based on the accelerator pedal operation and vehicle condition, and performs the controls shown in the table below: Control Sudden Accelerator Pedal Depress Control Sudden Accelerator Pedal Release Control Sudden Deceleration Downshift Control Operation When the driver operates (presses) the accelerator pedal quickly, this control causes the transmission to downshift rapidly to improve acceleration response. When the driver releases the accelerator pedal quickly, this control makes it easy for the transmission to hold the gear, which improves engine braking force and re-acceleration response. When the driver decelerates the vehicle suddenly, this control downshifts rapidly, which improves engine braking force and re-acceleration response. Available for 5th to 6th

3rd to 5th

4th to 6th

150

TOYOTA TUNDRA ­ NEW FEATURES

Multi-mode Automatic Transmission 1) General Multi-mode automatic transmission is designed to allow the driver to switch the gear ranges (multi-mode transmission is not for manually selecting single gears). After moving the shift lever to S, the driver can select the desired shift range by moving the shift lever to "+" or "­". Thus, the driver is able to shift gears with a manual-like feel.

"

System Diagram A Combination Meter S Mode Indicator Light Shift Range Indicator Shift-up Signal ("+") Shift-down Signal ("­") S Mode Signal

Transmission Control Switch

ECM Ignition Advance Control

Fluid Pressure Control

Shift Solenoid Valve Control

Engine A/T

04E0CH42C

TOYOTA TUNDRA ­ NEW FEATURES 2) Operation a. Column Shift

151

D The driver selects the S mode by engaging the shift lever. At this time, the S4 or S5 range is selected in accordance with the vehicle speed. (When the driver selects the S mode during AI-shift control, the current gear will be selected as the shift range.) Then, the shift range changes one at a time, as the driver moves the transmission control switch forward ("+") or backward ("­"). D Under the multi-mode automatic transmission control, the ECM effects optimal shift control within the usable gear range that the driver has selected. The 1st gear is shifted to when the vehicle is stopped. D Holding the transmission control switch in "+" with the shift lever in S will change the shift range to the S6 range regardless of range (S1 to S5). D When the shift lever is in S, the S mode indicator light in the combination meter illuminates. The shift range indicator indicates the shift range position that the driver has selected.

Transition of Shift Range Position S Mode Position Shift Pattern Transmission Control Switch

Shift Lever

: Default shift range

"

12DCH032Y

Usable Gear Chart A Shift Range Indicator Display 6 5 4 3 2 1 Usable Gears 6th $ 5th $ 4th $ 3rd $ 2nd $ 1st 5th $ 4th $ 3rd $ 2nd $ 1st 4th $ 3rd $ 2nd $ 1st 3rd $ 2nd $ 1st 2nd $ 1st 1st

Shift Range S6 S5 S4 S3 S2 S1

152 b. Floor Shift

TOYOTA TUNDRA ­ NEW FEATURES

D The driver selects the S mode by engaging the shift lever. At this time, the S4 or S5 range is selected in accordance with the vehicle speed. (When the driver selects the S mode during AI-shift control, the current gear will be selected as the shift range.) Then, the shift range changes one at a time, as the driver moves the shift lever forward ("+") or backward ("­"). D Under this control, the ECM effects optimal shift control within the usable gear range that the driver has selected. The 1st gear is shifted to when the vehicle is stopped. D Holding the shift lever forward ("+") will change the shift range to the S6 range regardless of range (S1 to S5). D When the shift lever is in S, the S mode indicator light in the combination meter illuminates. The shift range indicator indicates the shift range position that the driver has selected.

Transition of Shift Range Position

S Mode Position

Shift Pattern

: Default shift range

030SC29C

"

Usable Gear Chart A Shift Range Indicator Display 6 5 4 3 2 1 Usable Gears 6th $ 5th $ 4th $ 3rd $ 2nd $ 1st 5th $ 4th $ 3rd $ 2nd $ 1st 4th $ 3rd $ 2nd $ 1st 3rd $ 2nd $ 1st 2nd $ 1st 1st

Shift Range S6 S5 S4 S3 S2 S1

TOYOTA TUNDRA ­ NEW FEATURES Diagnosis

153

D When the ECM detects a malfunction, the ECM records the malfunction and memorizes the information related to the fault. Furthermore, the Malfunction Indicator Lamp (MIL) in the combination meter illuminates or blinks to inform the driver. D The ECM will also store the Diagnostic Trouble Codes (DTCs) of the malfunctions. The DTCs can be accessed using the Techstream. For details, see the 2010 TOYOTA TUNDRA Repair Manual. Fail-safe The fail-safe function minimizes the loss of operability when an abnormality occurs in a sensor or a shift solenoid valve.

"

Fail-safe Control List A Malfunction Part Function When the input speed sensor malfunctions, shift control is effected using the information from the output speed sensor signal (SP2). During an input speed sensor malfunction, upshifting to the 5th and 6th, AI-shift and flex lock-up clutch control are prohibited. When the output speed sensor malfunctions, shift control is effected using the information from the input speed sensor signal (NT). When the output speed sensor malfunctions, upshifting to the 5th and 6th, AI-shift and flex lock-up clutch control are prohibited. When the ATF temperature sensor No. 1 malfunctions, upshifting to the 5th and 6th and flex lock-up clutch control are prohibited. When a shift solenoid valve listed at left fails, the current to the failed shift solenoid valve is cut off. Shift control is changed to a fail-safe mode to shift gears using the normal shift solenoid valves to allow for continued driving. Refer to the table on the next page for an operation example. During a shift solenoid valve SL1 or SL2 malfunction, upshifting to the 5th and 6th and flex lock-up clutch control are prohibited. During a shift solenoid valve SLU malfunction, the current to the shift solenoid valve is stopped. Because this stops the lock-up control and flex lock-up control, fuel economy decreases. During a shift solenoid valve SLT malfunction, the current to the shift solenoid valve is stopped. Because this stops the line pressure optimal control, the shift shock increases. However, shifting is effected through normal clutch pressure control.

Input Speed Sensor (NT)

Output Speed Sensor (SP2) ATF Temperature Sensor No. 1 (THO1) Shift Solenoid Valves S1, S2, S3, S4 and SR Shift Solenoid Valves SL1 and SL2 Shift Solenoid Valve SLU

Shift Solenoid Valve SLT

154

"

TOYOTA TUNDRA ­ NEW FEATURES Normal Condition A

S1 Off On On On On On Off On On On On Off On On On Off On On Off On Off S2 On On Off Off Off On On On Off Off Off On On Off Off On On Off On On On S3 On On On Off Off Off On On On Off Off On On On Off On On On On On On Shift Solenoid Valve S4 Off Off Off Off On On Off Off Off Off On Off Off Off Off Off Off Off Off On Off SR On On On On Off Off On On On On Off On On On On On On On On On On SL1 Off Off Off Off On On Off Off Off Off On Off Off Off Off Off Off Off Off Off Off SL2 On On On On Off Off On On On On Off On On On On On On Off On Off Off Gear 1st 2nd 3rd 4th 5th 6th 1st 2nd 3rd 4th 5th 1st 2nd 3rd 4th 1st 2nd 3rd 1st 2nd 1st

Shift Position or Range

D, S6

S5

S4

S3

S2 S1 "

Example (Shift Solenoid Valve S1 Malfunction) A

S1 × × × × × × × × × × × × × × × × × × × S2 S1 × × S2 On On ! Off Off Off Off On ! Off On On ! Off Off Off Off On On ! Off Off Off On On ! Off Off On On ! Off On Shift Solenoid Valve S3 S4 On Off On ! Off Off On ! Off Off Off Off Off On Off On On Off On ! Off Off On ! Off Off Off Off Off On On Off On ! Off Off On ! Off Off Off Off On Off On ! Off Off On ! Off On On ! Off On Off Off On ! Off Off SR On On On On Off Off On On On On Off On On On On On On On On On On SL1 Off Off Off Off On On Off Off Off Off On Off Off Off Off Off Off Off Off Off Off SL2 On On On On Off Off On On On On Off On On On On On On Off ! On On Off ! On Off Gear 1st 1st ! 4th 3rd ! 4th 4th 5th N ! 5th 1st 1st ! 4th 3rd ! 4th 4th 5th 1st 1st ! 4th 3rd ! 4th 4th 1st 1st ! 4th 3rd (E / B) ! 4th 1st 3rd (E / B) ! 4th 1st (E / B)

Shift Position or Range

D, S6

S5

S4

S3

E/B: Engine Braking

Information

A760E and A760F Automatic

47 pages

Find more like this

Report File (DMCA)

Our content is added by our users. We aim to remove reported files within 1 working day. Please use this link to notify us:

Report this file as copyright or inappropriate

738370


You might also be interested in

BETA
TRANSMISSION Workshop Manual FF A/T(E-W)
sem index ED.cdr
Bulletin Index 01-25-2004.cdr
Operator's Manual AT, MT, HT Series
Operator's Manual 3000 And 4000 Product Families Rugged Duty Series (RDS)