A750E AND A750F AUTOMATIC TRANSMISSION

1 CHASSIS A750E AND A750F AUTOMATIC TRANSMISSIONCH-2A750E AND A750F AUTOMATIC TRANSMISSION DESCRIPTIONAn A750E (for 2WD model) or A750F (for 4WD model) 5-speed Super ECT (Electronic ControlledTransmission) is used. The only difference between the A750E and A750F is in the extension housing andoutput shaft. These AUTOMATIC transmissions are equipped with multi-mode AUTOMATIC TRANSMISSION function. Fordetails, see page CH-34. These AUTOMATIC transmissions are equipped with an ATF warmer as standard equipment to warm up ATF. Some models are also equipped with an ATF cooler as an option to ensure high ATF cooling performance. Either a column shift lever or floor shift lever is available depending on the seat type (bench type orseparate type). The ATF warmer, ATF cooler, column shift lever and floor shift lever are available as shown below. : Standard OP: Option -: Not EquippedEngine Type( TRANSMISSION Type)1GR-FE( A750E )2UZ-FE( A750E , A750F )Cab TypeRegularDoubleRegularDoubleCrewMaxDec k typeStandardLongStandardStandardLongStan dardLongShortATF Warmer ATF Cooler---OPOPOP OPColumn Shift Lever *1 *1 Floor Shift LeverOP-OPOP-OP*1, *2OP *2*1: Except Limited Grade *2: Limited Grade OnlyA750F (For 4WD)04E0CH124CA750E (For 2WD)04E0CH125 CCHASSIS A750E AND A750F AUTOMATIC transmissions ervice TipCH-24.

2 Diagnosis When the ECM detects a malfunction, the ECM records the malfunction and memorizes the informationrelated to the fault. Furthermore, the MIL (Malfunction Indicator Lamp) in the combination meterilluminates or blinks to inform the driver. The ECM will also store the DTCs (Diagnostic Trouble Codes) of the malfunctions. The DTCs can beaccessed using the hand-held tester or Techstream*. For details, see the 2007 TOYOTA TUNDRA Repair Manual (Pub. No. RM04E2U). The ECM uses the CAN protocol for diagnostic communication. Therefore, a hand-held tester orTechstream* and a dedicated adapter [CAN VIM (Vehicle Interface Module)] are required foraccessing diagnostic data. To clear DTCs that are stored in the ECM, use a hand-held tester or Techstream*, disconnect thebattery terminal or remove the EFI fuse for 1 minute or details, see the 2007 TOYOTA TUNDRA Repair Manual (Pub. No. RM04E2U).*: Techstream is the name for the diagnostic tester in North America, but other countries will continue to usethe hand-held Fail-safeThe fail-safe function minimizes the loss of operability when any abnormality occurs in a sensor or solenoid.

3 Fail-safe Control List Malfunction PartFunctionInput Speed Sensor (NT)During an input speed sensor malfunction, shift control is effected based on theoutput speed sensor signal (SP2).During an input speed sensor malfunction, up-shifts to 5th, AI-SHIFT and flexlock-up clutch control are Speed Sensor (SP2)During an output speed sensor malfunction, shift control is effected based onthe input speed sensor signal (NT).During an output speed sensor malfunction, up-shifts to 5th, AI-SHIFT andflex lock-up clutch control are Temperature Sensor (THO1)During an ATF temperature sensor malfunction, up-shifts to 5th and flexlock-up clutch control are Valve S1, S2, and SRWhen a solenoid valve listed at left malfunctions, current to the failed solenoidvalve is cut control is changed to a fail-safe mode to shift gears using the normalsolenoid valves to allow continued driving. Refer to the table on the next pagefor operation Valve SL1 and SL2 During a solenoid valve SL1 or SL2 malfunction, up-shifts to 5th and flexlock-up clutch control are Valve SLUD uring a solenoid valve SLU malfunction, the current to the solenoid valve isstopped.

4 Because this stops lock-up control and flex lock-up control, fueleconomy Valve SLTD uring a solenoid valve SLT malfunction, the current to the solenoid valve isstopped. Because this stops line pressure optimal control, the shift shock willincrease. However, shifting is effected based on normal clutch A750E AND A750F AUTOMATIC TRANSMISSIONCH-3 NormalPositionShift Solenoid ValveGearS1S2 SRSL1SL2 GearONOFFOFFOFFON1stDONONOFFOFFON2ndD,S5 OFFONOFFOFFON3rdS5 OFFOFFOFFOFFON4thOFFOFFONONOFF5thONOFFOF FOFFON1stS4 ONONOFFOFFON2ndS4 OFFONOFFOFFON3rdOFFOFFOFFOFFON4thONOFFOF FOFFON1stS3 ONONOFFOFFON2ndOFFONOFFOFFOFF3rd (E/B)S2 ONOFFOFFOFFON1stS2 ONONONOFFOFF2nd (E/B)S1 ONOFFOFFOFFOFF1st (E/B) Example Shift Solenoid Valve S1 MalfunctionPositionShift Solenoid ValveGearS1S2 SRSL1SL2 Gear OFF ONOFFOFFON4th 3rdD ONOFFOFFON3rdD,S5 ONOFFOFFON3rdS5 OFFOFFOFFON4th OFFONONOFF5th OFF ONOFFOFFON4th 3rdS4 ONOFFOFFON3rdS4 ONOFFOFFON3rd OFFOFFOFFON4th OFF ONOFFOFFON OFF3rd 3rd (E/B)S3 ONOFFOFFON OFF3rd 3rd (E/B) ONOFFOFFOFF3rd (E/B)S2 OFFOFFOFFON1stS2 ONONOFFOFF3rd (E/B)S1 OFFOFFOFFOFF1st (E/B)E/B.

5 Engine BrakeCHASSIS A750E AND A750F AUTOMATIC TRANSMISSIONCH-2 ATF COOLERAn air-cooled type ATF cooler is used to maintain ATF cooling performance under high Cooler Core TOYOTA GENUINE ATF WS Toyota genuine ATF WS is used to reduce the resistance of the ATF and improve fuel economy by reducingits viscosity in the practical operating temperature range. At higher-fluid temperatures, the viscosity is thesame as that of Toyota genuine ATF Type T-IV, to ensure the durability of the AUTOMATIC TRANSMISSION . There is no interchangeability between the Toyota genuine ATF WS and other types of ATF (ToyotaGenuine ATF Type T-IV, D-II).259 LSK03: Toyota Genuine ATF WS: Toyota Genuine ATF Type T-IVTemperatureHighReduced ViscosityHighViscosityCHASSIS A750E AND A750F AUTOMATIC TRANSMISSIONCH-2 SPECIFICATIONSE ngine Type1GR-FE2UZ-FETransmission Gear Gear Fluid TypeToyota GenuineATF WS Fluid Capacity Without ATF ( , ) Fluid Capacity Liters (US qts, Imp.)

6 Qts)With ATF ( , ) We ight (Reference)* Without ATF ( ) ( ) ( )Weight (Reference) kg (lb)With ATF ( ) ( )*: The figure shown is the weight of the part including A750E AND A750F AUTOMATIC TRANSMISSIONCH-304E0CH126CC1F2 Front Planetary GearCenter Planetary GearRear Planetary GearB4F3B2B1C2 Input ShaftC3B3F1 Engine Type1GR-FE2UZ-FETransmission Clutch67 Clutch56 Clutch5 BrakeThe No. of Discs34 Brake3 Brake4 Brake8 One-way Clutch18 One-way ClutchThe No. of Sprags25 One-way Clutchpg26 The No. of Sun Gear Teeth40 Front Planetary GearThe No of Pinion Gear TeethInner22 Front Planetary GearThe No. of Pinion Gear TeethOuter21 The No. of Ring Gear Teeth91 The No. of Sun Gear Teeth31 Center Planetary GearThe No. of Pinion Gear Teeth23 yThe No. of Ring Gear Teeth77 The No. of Sun Gear Teeth25 Rear Planetary GearThe No. of Pinion Gear Teeth19 yThe No. of Ring Gear Teeth63 CHASSIS A750E AND A750F AUTOMATIC TRANSMISSIONCH-2 TORQUE CONVERTERA compact, lightweight and high-capacity torque converter is used.

7 The torque converter supports flexlock-up clutch control, thus allowing for improved fuel ClutchStatorPump ImpellerTurbine RunnerLock-up Clutch Specifications Engine Type1GR-FE2UZ-FETransmission TypeA750EA750EA750 FStall Torque , 1-Step, 2-Phase OIL PUMPThe oil pump is driven by the torque converter. It lubricates the planetary gear units and supplies operatingfluid pressure for hydraulic pump cover is made of aluminum to reduce ShaftPump CoverDriven GearDrive GearPump BodyCHASSIS A750E AND A750F AUTOMATIC TRANSMISSIONCH-2 ATF WARMER1. GeneralThe 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, thusimproving fuel economy. Models equipped with an ATF cooler have a TRANSMISSION oil thermostat to switch the ATF - A Cross Section: OUT (ATF): IN (ATF)AIN (Engine Coolant)OUT (Engine Coolant)ATF WarmerWith ATF CoolerWithout ATF CoolerATF WarmerView from BFrom ATF CoolerBFrom A/TTo ATF CoolerTo A/TFrom EngineTo Engine: ATF Flow: Engine Coolant FlowATF WarmerTransmission Oil ThermostatACHASSIS A750E AND A750F AUTOMATIC TRANSMISSIONCH-32.

8 TRANSMISSION Oil ThermostatThe 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 valveand close the bypass valve, thus switching the ATF ATF CoolerElement Case (Contains Wax) poppet Valve: CloseFrom ATF CoolerFrom A/TBypass Valve: OpenATF FlowTo A/TATF Temperature: Low04E0CH109 CTo ATF CoolerElement Case (Contains Wax) poppet Valve: OpenFrom ATF CoolerFrom A/TBypass Valve: CloseATF FlowTo A/TATF Temperature: HighCHASSIS A750E AND A750F AUTOMATIC TRANSMISSIONCH-43. ATF and Engine Coolant CircuitsModels without ATF Cooler04E0CH53 CATF Warmer: Engine Coolant Flow: ATF FlowEngineA/THeaterCoreModels with ATF Cooler When the ATF is at a low temperature, it is warmed up by the engine coolant in the ATF warmer. When the ATF is at a high temperature, it flows to the ATF warmer and then to the ATF cooler, thus itis cooled : Engine Coolant Flow: ATF FlowPoppet ValveElement Case (Contains Wax)ATF CoolerBypass ValveTransmission Oil ThermostatATF WarmerEngineA/THeaterCoreCHASSIS A750E AND A750F AUTOMATIC TRANSMISSIONCH-2 VALVE BODY UNIT1.

9 GeneralThe valve body unit consists of the upper ( and ) and lower valve bodies and 7 solenoid Valve SLTS olenoid Valve SL1 Lower Valve BodySolenoid Valve S1 Solenoid Valve S2 Solenoid Valve SRSolenoid Valve SLUS olenoid Valve Upper Valve Upper Valve Body Upper Valve Body 229LC162 Brake Control Valve3 - 4 Shift ValveC3 Check ValveLock-up Control ValveLock-up Relay ValveSecondary Regulator ValveB1 Apply Control Valve1 - 2 Shift Valve2 - 3 Shift ValveSolenoid Modulator ValveClutch Lock ValveB1 AccumulatorCHASSIS A750E AND A750F AUTOMATIC TRANSMISSIONCH-3 Upper Valve Body 229LC163 Coast Brake Relay Valve Lower Valve Body 229LC164 Accumulator Control ValveClutch Control ValvePrimary Regulator ValveSLT DamperSequence ValveClutch Apply Control ValveCHASSIS A750E AND A750F AUTOMATIC TRANSMISSIONCH-42. Solenoid ValveSolenoid Valve S1, S2 and SR Solenoid valves S1 and SR use a 3-way solenoid valve. Solenoid valve S2 uses a 2-way solenoid valve.

10 A filter is provided at the tip of each solenoid valve to further improve operational PressureControl PressureFilterDrainSolenoid Valve S1 OFFC ontrol PressureLinePressureFilterControl PressureSolenoid Valve S1 ONSolenoid Valve S2 OFFS olenoid Valve S2 ON229LC166 Function of Solenoid Valve S1, S2 and SR Solenoid ValveTypeFunctionS13-waySwitches the 2 - 3 shift valveS22-way Switches the 1 - 2 shift valve Switches the 3 - 4 shift valveSR3-waySwitches the clutch apply control valveCHASSIS A750E AND A750F AUTOMATIC TRANSMISSIONCH-5 Solenoid Valve SL1, SL2, SLT and SLU SL1, SL2, SLT, and SLU are used by the ECM to control hydraulic pressures in a linear fashion basedon the current that the ECM causes to flow through their solenoid coils. They control line, clutch, andbrake engagement pressure based on the signals received from the ECM. The solenoid valves SL1, SL2, SLT, and SLU have the same basic Valve SL1, SL2, and SLTC urrentHydraulic PressureSolenoid Valve SLTS olenoid CoilSpool ValveSleeveSolenoid Valve SLUC urrentHydraulicPressure Function of Solenoid Valve SL1, SL2, SLT and SLU Solenoid ValveFunctionSL1 Clutch pressure control Accumulator back pressure controlSL2 Brake pressure controlSLT Line pressure control Accumulator back pressure controlSLULock-up clutch pressure controlCHASSIS A750E AND A750F AUTOMATIC TRANSMISSIONCH-24.