課件教案培訓(xùn)gm5auto

1、GM5 AUTOMATIC GEARBOXGeneral DataMake/Type General Motors GM5 automatic, type 5L40-E, 5 speed with Steptronic control and sport modeGears 5 forward 1 reverseGearbox oil Texaco ETL-7045ERefill 5.3 litres (11.4 litres NAS)Fill from dry 9.7 litres (20.4 litres NAS)GeneralManufactured by General Motors

2、in Strasbourg, FranceControlled by Electronic Automatic Transmission (EAT) ECUSemi-automatic Steptronic transmissionConventional P, R, N, D and electronic sport mode.Component Location EAT ECU ECM Instrument pack Selector lever assembly Gearbox Valve block and solenoids Gearbox fluid cooler.Features

3、Designed to provide maintenance free operationTransmission fluid is fill for lifeTorque converter features a gradual slip lock-up featureTorque converter lock-up is available in 3rd, 4th and 5th gearsEAT ECU control shift program logicConnected to ECM via CAN for system communicationsDiagnostics ava

4、ilable from EAT ECU via ISO 9141 K LineDefault mode if major faults occur.Exploded ViewTorqueconverterassemblyFluidpanFluidfilterValvebodyExtensionSectional ViewBell housingTorque converterFluid pumpMain casingDrive clutch (CD)Freewheel clutch FW3(forward clutch sprag)Freewheel clutch FW3(Intermedia

5、te clutch sprag)Freewheel clutch FW4(low clutch sprag)Freewheel clutch FW2(second clutch sprag)Extension caseOutput shaftBrake clutch (CC2)Drive clutch (C2)Brake Clutch (LBC)Drive clutch (CI)Drive clutch (COD)Drive clutch (C1)Drive clutch (CR)Brake clutch (CC1)Fluid panFluid filterFluid pump cover p

6、lateFluid CoolingCooled by engine coolant which flows in a water jacket around cores within the cooler bodyTransmission fluid enters the cooler and flows through cores where it is cooled by the engine coolantFluid leaves the cooler and is passed back to lubricate the transmission before it returns t

7、o sumpReceives its engine coolant supply from the radiator via a hose into a quick release fitting on the side of the coolerCoolant flows through the cooler and exits via another hose on the cooler, where it is passed through the engine coolant circuit.FluidfeedFluidreturnCoolant returnCoolant feedF

8、luid feedFluid returnGear Lever Selector AssemblyLever is connected to a gimbal mechanism allowing selection of P, R, N, D, automatic and sport/manual (+/- Steptronic)In the M/S position, the Bowden cable is mechanically disconnectedIf left in Sport mode all gear changes are performed automaticallyI

9、n Manual mode, all gear changes are based on switched ground inputs received by the EAT ECU from the Manual +/- switch.Selector Lever PositionsP (Park) - Prevents vehicle from moving by locking transmissionR (Reverse) - Select only when vehicle is stationary and engine is at idleN (Neutral) - No tor

10、que transmitted to drive wheelsD (Drive) - Uses all five forward gears in high and low rangesM/S (Sport mode) - Uses all five forward gears as in D, but will upshift at higher engine speeds improving acceleration+ and - (Steptronic mode) - Movement of selector lever in +/-positions, when lever is in

11、 M/S position, transmission will operate in manual (Steptronic) mode, allowing the driver to manually select all five forward gears.Manual +/- Steptronic SwitchLocated on left hand side of selector lever assemblyHousing provides the location for a sliding contactA dog on the lever engages with a slo

12、tted abutment on the switch sliding contact for manual/sport positionWhen the lever is moved to the + or - position the dog moves the switchA momentary earth circuit is completed with one of two microswitches at each end of the switch which corresponds to + or -Momentary signal is received by the EA

13、T ECUOn switches first operation, manual mode is initiated and operates transmission in the selected gearIn this position, a spring moves the selector lever to the centre position when released.Shift Interlock SolenoidLocated at the front of the selector lever assemblyConnected to a locking plate wh

14、ich has two holes corresponding to the P and N positionsIgnition on or engine running, the solenoid is energised when the selector lever is in P or N positionsWhen energised, the solenoid ejects a pin which engages in the locking plate preventing the lever from being movedWith foot brake applied, a

15、brake switch signal is passed to EAT ECUEAT ECU de-energises solenoid allowing the lever to be moved from P or N positionPrevents selector being moved to D or R position unintentionallyBrake application prevents the vehicle creepingEngine speed above 2500 rev/min and vehicle speed above 1.8 mph (3 k

16、m/h) also prevents selector lever movement, even if the brake pedal is depressed.High/Low Range Selector SwitchLocated on selector lever cover, on the right hand side of the selector leverIdentified by a high/low range legend graphic and the white switch leverSelected providing vehicle is stationary

17、 and gear selector lever is in neutralSwitch has connections to both EAT ECU and transfer box ECU.Hill Descent Control (HDC) SwitchLocated on selector lever cover, on the left hand side of selector leverIdentified by HDC legend graphic and yellow switch leverSwitch operation is not directly related

18、to automatic transmission operation (refer to Brakes section for further details).Selector Position LED DisplayLocated on selector lever cover, between HDC and high/low range switchesDisplay has graphic which shows lever positions P, R, N, D, M/S and +/-P, R, N, D and M/S positions each have a small

19、 red LEDThe +/- positions do not have an LEDDisplay is controlled by selector lever position switch, which is connected via a five wire ribbon cablePowered from the BCU and remains illuminated until the BCU is in sleep modeActive at all times when the ignition is on.Selector Lever Position SwitchLoc

20、ated on right hand side of selector lever assemblySwitch has a moving contact which is connected to the selector leverAs lever moves, sliding contact moves in the switch completing a circuit with four further contacts; P, R, N and DConnects to selector position LED display via a ribbon cable and pro

21、vides power for display LEDsReceives its power supply from the BCU.Manual/Sport SwitchLocated at the rear of the selector lever assemblyCam operated microswitchLever with a roller is attached to the switch bodyWhen moved from D to M/S, the roller contacts a cam which depresses the switch lever and o

22、perates the switchSwitch contacts remain closed when selector lever is in M/S positionSwitch completes an earth path which switches operation to sport when M/S is selected and deselects sport mode when D is reselectedCompleted earth path is connected to EAT ECU via M/S LED on the selector lever disp

23、laySelector lever display is illuminated by an output from the ECU when M/S is selected.Selector CableBowden type cable that connects selector lever to the manual selector spool valveC clip secures the outer cable to the selector lever assemblyInner cable is secured to an arm which connects to the s

24、elector leverTransmission operating lever attaches to and operates the manual selector control spool valveInner cable attaches to operating lever by a clamp bush and locknutClamp bush allows for adjustment of the selector cable.Key Interlock MechanismPrevents key from being removed when the selector

25、 lever is any position other than PPrevents vehicle being accidentally left in neutralMechanical mechanism is operated by a Bowden cableWith ignition on, the switch rotates a lever which in turn pulls the cableThis lifts a latch in the selector lever assembly which is engaged with the selector lever

26、 when in the P position.Instrument PackTransmission status is transmitted by the EAT ECUStatus is displayed to the driver on one of two displaysRefer to the Instruments section for detailed description of functions.Transmissionstatus displayMessagecentreMalfunction Indication LampLocated in lower le

27、ft hand corner of the instrument pack, below the fuel gaugeTransmission related faults which may affect the emissions will illuminate the MILECM illuminates MIL on receipt of a relevant fault message from the EAT ECU on CANNature of the fault can be diagnosed using TestBook/T4 stored in the ECU memo

28、ry.Transmission Status DisplayLocated on the right hand side of the instrument pack, below the tachometerShows selector lever position and in the case of manual (Steptronic) mode, the selected gearSelector lever position and gear selected displays are illuminated in green when active.Selector Lever

29、and Gear Selected DisplayAdditionally, display also shows a low range symbol when low range is selectedSymbol is illuminated in an amber colour when activeSymbolDescriptionPPark selectedRReverse selectedNNeutral selectedDDrive selected11st gear selected (Manual mode)22nd gear selected (Manual mode)3

30、3rd gear selected (Manual mode)44th gear selected (Manual mode)55th gear selected (Manual mode)Low range selected. Flashes when changing from low to high rangeWhen changing from low to high, the low range symbol flashes until the range change is completeMessage Centre DisplayLocated below the speedo

31、meter and the tachometerLCD relays vehicle status information to the driverCan display the following transmission related messages:SPORT MODECan display the following transmission related messages:MANUAL MODECan display the following transmission related messages:SELECT NEUTRALCan display the follow

32、ing transmission related messages:TRANSMISSN OVERHEATCan display the following transmission related messages:TRANSMISSN FAILSAFE PROGCan display the following transmission related messages:LOW RANGECan display the following transmission related messages:HIGH RANGECan display the following transmissi

33、on related messages:SLOW DOWNCan display the following transmission related messages:SELECT NEUTRAL.EAT ECUSoftware designed in conjunction with Land Rover, Siemens and General Motors PowertrainLocated in the E-box which is located forward of the RH suspension top mountECU has blue connector socket

34、colour which assists identificationE-box has a temperature controlled environment which maintains the optimum temperature for ECU operation.E-boxEAT ECU Inputs and OutputsSensor signals allow EAT ECU to monitor transmission operationProcesses incoming signals and compares information with data store

35、d in its memoryIf received signals are not within stored values, ECU makes adjustments to transmission operationSensor inputs provide EAT ECU with a constant update of the operating condition of the transmission and the engineCompares this input data with mapped information stored in its memoryMakes

36、 any required adjustment by operating various solenoids.Main RelayLocated inside the E-box and is identified by its blue colourConnected direct from the battery via a 100 Amp remote fuseRelay coil is controlled by the ECMECM provides a ground for the coil when the relay is to be energisedWhen energi

37、sed, battery voltage is supplied, via fuse 4, to the EAT ECU.Diagnostic SocketLocated in the fascia, in the drivers side stowage trayAllows exchange of information between various ECUs on the bus systems and TestBook/T4Information is communicated to the socket via a diagnostic ISO9141 K LineAllows r

38、etrieval of diagnostic information and programming of certain functionsEAT ECU uses a P Code strategy.Controller Area Network (CAN) Bus CAN bus is connected between the following electronic units: EAT ECU ECM Transfer box ECU Air suspension ECU Instrument pack ABS ECU Steering angle ECUController Ar

39、ea Network (CAN) Bus CAN allows fast exchange of data between ECUs every few microseconds Comprises two wires which are identified as CAN high (H) and CAN low (L) Two wires are coloured yellow/black (H) and yellow/brown (L) Two wires are twisted together to minimise electromagnetic interference prod

40、uced by the CAN messagesController Area Network (CAN) Bus In the event of a CAN bus failure the following symptoms may be observed: Transmission operates in default mode Torque converter lock-up control is disabled ECM to EAT ECU engine torque reduction message inoperative Gear position display in i

41、nstrument pack inoperative.Driving Modes Normal mode: Automatic and adaptive modes are active Uses gear shift and lock-up maps to allow vehicle operation Sport Mode: Shift maps allow downshift more readily and hold gears for longer SPORT is displayed in the message centre when sport is selected Manu

42、al (Steptronic) Mode: Allows transmission to operate as a semi-automatic Steptronic unit Driver can change up and down as per manual transmissionDriving Modes Cruise Mode: EAT ECU receives a cruise active message on the CAN Cruise control map activated preventing locking/unlocking of TCC ECM requests a down shift if vehicle speed exceeds set cruise limit Hill Mode: Initiated when high engine torque, high throttle angle and low engine speed is detected Shift pattern modified to raise shift points Also initiated when vehicle is at very high al