DescriptionThe electronic automatic transmission is hydraulically controlled by a hydrodynamic torque converter with controlled lock.The driver can choose to drive the car with the transmission working in fully automatic mode or switch to sequential manual mode, when the car can be driven in a more sporty manner in conditions (fast driving over mixed routes with bends and continual gradient changes) where a fully automatic transmission would not make the most of the car's qualities.When the lever is positioned to the left of the normal selection channel, the transmission is set to engage top or bottom gear and sends a forward or backward command to the gear knob. Naturally gear changes only take place if the engine rpm so permit; when the vehicle is stopped, the gearbox changes automatically to 1 st gear. The automatic transmission is controlled by an electronic control unit that computes the most suitable gear ratio and converter lock condition from signals sent in by the injection system (rpm, fuel injection, throttle position and coolant temperature) and transmission sensors (turbine rpm, car speed and transmission temperature) in order to send controls to the solenoid unit.
Functional description The electronic automatic transmission (EAT) control unit M55 monitors and governs the entire automatic transmission management system. The control unit is supplied directly by the battery via the line of maxifuse CENTR of B5 , to pin 55 of M55 via a line protected by fuse F10 of junction unit B1 . Ignition-operated power supply (INT/A) reaches pin 31 and 54 of M55 via a line protected by specific fuse B42 . Pins 6, 28 and 34 of control unit M55 are earthed. Control unit M55 is connected to EAT solenoid L50, which contains the valves which control the pressure regulators and certain sensors:pin 52 of M55 supplies the solenoids, whose control signals are sent from pins 30 and 33 of M55 ;pin 3 of M55 supplies the pressure regulators, whose control signals are sent from pins 1, 4, 5 and 29 of M55 ;pins 14, 15 and 42 of M55 are connected to the car speed sensor inside unit L50 ;pins 16, 23 and 44 of M55 are connected to the transmission input rpm sensor inside unit L50 ;Control unit M55 is connected to the EAT sensor unit via junction D79:pin E of D79 is supplied directly from the battery via the line of maxifuse CENTR of B5 , via a line protected by fuse F10 of junction unit B1 : pin K is earthed.pins G and H of D79 are connected to the reversing sensor and send signals to turn on the reversing light (3309201SeeE2022REVERSING LIGHTS)Pins A, B, C and D of D79 are connected to control unit M55 and indicate the positions assumed by the lever selector to pins, 36, 8, 37 and 9 of M55 respectively.Control unit M55 governs a series of safety checks:shift lock (lever locked if key not turned to MAR and brake pressed): sends a signal from pin 32 to the speed control unit H37 pin 14;key lock (key locked if the gear shift is not set to P): sends a signal from pin 48 to relay J6 : this is excited by electrical current from the battery via line of maxifuse CENTR of B5 via a line protected by fuse F17 of junction unit B1 and controls the lock electromagnet built into ignition switch H1 ;doors open buzzer: the signal that the driver's door is open - lock N50 reaches pin 45 of M55 ; the command for the buzzer, located in C pin 11, is sent from pin 51start-up (the engine will start only with the gear shift set to P or N): a signal is sent from one of the two sensors (pin I of connector D79 to relay J5 which enables start-up: pin 50 of starter motor A20 (3309762SeeE5010STARTING AND RECHARING). Control unit M55 is equipped with a self-diagnostic unit that may be used by connecting the unit to connector R10 : this receives signals from pin 50 of control unit M55 . The self-diagnostic system also generates a signal - from pin 25 - sent to the automatic transmission fault warning light, located on instrument panel E50 , while pin 15 of connector A of E50 supplies an ignition-operated power supply (INT/A) via fuse F1 of junction unit B1 . Gear control unit H37 is supplied at pin 10 directly from the battery from a line protected by maxifuse CENTR of B5 via a line protected by fuse F17 of junction unit B1 and when the ignition is operated (INT/A) to pins 8 and 9 of a line protected by fuse F5 of junction unit B1 ; pins 1, 16 and 17 are earthed. Unit H37 is conected to instrument E50 from pins 3, 4, 5, 6 and 7 to turn on the warning light leds for the relevant speeds. Unit H37 connects control unit M55 via pins 18, 19 and 20 to pins 12, 35 and 13 respectively to indicate activation of the TIP function (manual transmission operation). The control unit M55 is connected to the engine management control unit M10 and the ABS control unit M50 , which indicates skidding of the front wheels. This connection is via the CAN line from pins 82, 83, 85 and 86 of M55 and manages the control of the programme called 'WINTER'.
0Removing201Refitting213314824-5505A18multi-function controlunit - r r . 1. Undo the bolt (1a) and push back the junction unit as far asnecessary to disconnect the electrical connections (1b).767For precise identification ofthe electrical connections, see Wiring Diagrams Section.2. Remove the junction unit.2010592
0Removing201Refitting21 Make sure that the ignitionis off (STOP position), then disconnect the negative battery terminal(refer to op. 33148615530B10battery - r+r ). 1. Unscrew bolt (1a) and open fuse access cover (1b).2. Undo the bolt (2a) and remove the integrated multiservices unit(2b) after having disconnected the electrical connections (2c),(2d), (2e), (2f) and (2g).2010595
5505A29
0Removing201Refitting21Open the bonnet lid.1. Release the retainers (1a) and remove the cover (1b) for theadditional junction unit.2071293
0Removing201Refitting213314864-5530B54battery cover - r+r . Make sure that the ignition key is in theOFF position.1. Disconnect the battery negative and positive terminals.2. Undo the bolt (2a) fixing the battery retaining bracket (2b).3. Remove the battery.2010647
5530B40
0Removing201Refitting213314864-5530B54battery cover - r+r1. Press and release the retainers (1a), then remove the cover (1b)for the supply box on the battery. 2071303
0Removing201Refitting21 Make sure that the ignitionis off (STOP position), then disconnect the negative battery terminal(refer to op. 33148615530B10battery - r+r ). Lower the steering wheel and move it back.1. Undo the bolts (1a) and remove the upper half casing for thesteering column (1b).2010703
5560B12
0Removing201Refitting21 Make sure that the ignitionis off (STOP position), then disconnect the negative battery terminal(refer to op. 33148615530B10battery - r+r ). Open the fuse carrier compartment flap.1. Using the tool (1a) and pushing the fuse carrier compartment,remove the surround (1b) complete with switches.2. Disconnect the elelectrical connections (2a), (2b) and (2c) andremove the surround complete with switches.2010706
0Removing201Refitting211. Remove the automatic transmission torque converter from the gearbox.767Take care not to spill the fluidinside the converter, then seal the fluid inlet port using a suitableplug to prevent foreign bodies from entering.2009557
0Removing201Refitting21Place the vehicle on a ramp.3314110-1048A28vacuum air circuit resonator pipe - r+r . 1. Undo the bolts (1a) and remove the bracket (1b) connecting theair cleaner casing to the A.B.S. control unit support.2. Undo the top bolts securing the automatic transmission top cover.2009558
0Removing201Refitting21Move the automatic transmission manualcontrol leverl to the P position. Make sure that the ignition is in the OFFposition, then disconnect the negative battery terminal (refer to op. 33148615530B10battery - r+r ). 3314110-1048A28vacuum air circuit resonator pipe - r+r . 1. Disconnect the electrical connection of the automatic transmissiongear selector.2009562
0Removing201Refitting21Place the vehicle on a ramp.3314703-4450B10Front WHEEL (one) - R.R. (left). 3315298-7055B39front additional wheel arch half (one), lh or rh,front element - r r (left). 1. Undo the bolt (1a) and remove the bracket (1b) securing the fluidrecirculation pipe on the transmission casing.2. Undo the connector (2a) complete with seal (2b) and remove thefluid recirculation pipe on the electronic automatic transmissioncasing (2c).767Collect the automatic transmissionfluid which leaks out in a suitable container.3. Remove the O-Ring seal.2009565
0Removing201Refitting21 Make sure that the ignition is off (STOPposition), then disconnect the negative battery terminal (referto op. 33148615530B10battery - r+r ). 3314048-1016A40ignition coil cover on cylinder head- r+r . 3314111-1048A48throttle heater sleeve - r r . 1. Disconnect the electrical connection from the butterfly casingintegrated with the M.D.S.2. Disconnect the electrical connections (2a) and (2b) from theinjection/ignition control unit and the earth lead (2c) from thebutterfly casing integrated with the M.D.S.3. Disconnect the accelerator cable from the butterfly casing integratedwith the M.D.S.4. Disconnect the injection/ignition wiring from the mounting bracket.5. Undo the bolts (5a) and remove the butterfly casing integratedwith the M.D.S. (5b) complete with the injection/ignition controlunit (5c).2007326
1056B21
0Removing201Refitting21 Ensure that the ignition key is in OFFposition, then disconnect the battery negative terminal ( 3314861-5530B10battery - r+r ). Proceed with the removal 3315197-7040D14engine bay rear sidecover (one) lh or rh - r r (Right side). 1. Loosen the band (1a) and disconnect the oil vapour recirculationpipe (1b) from the corrugated hose.2. Loosen the bands (2a) and remove the hose between resonator andthrottle body (2b), complete with resonator (2c).2007327
1056B48
0Removing201Refitting21 Make sure that the ignition is off (STOPposition), then disconnect the negative battery terminal (referto op. 33148615530B10battery - r+r ). 3314048-1016A40ignition coil cover on cylinder head- r+r . 1. Disconnect the electrical connection from the phase transformerelectro-magnet.2. Undo the bolts (2a) and remove the phase transformer electro-magnet(2b).2007334
1056B50
0Removing201Refitting21 Make sure that the ignition is off (STOPposition), then disconnect the negative battery terminal (referto op. 33148615530B10battery - r+r ). 3314110-1048A28vacuum air circuit resonator pipe - r+r1. Disconnect the electrical connection from the engine coolanttemperature sensor.2. Undo and remove the engine coolant temperature sensor.2007335
0Removing201Refitting21 Make sure that the ignition is off (STOPposition), then disconnect the negative battery terminal (referto op. 33148615530B10battery - r+r ). 3314048-1016A40ignition coil cover on cylinder head- r+r . Discharge the fuel supply pressure (seeGroup 10 Warnings).1. Disconnect the rapid attachment for the fuel supply pipe.2. Disconnect the electrical connections from the injectors (2a)and the electrical connection from the phase transformer electro-magnet(2b).3. Undo the two bolts (3a) and remove the single fuel manifold pipe(3b) complete with injectors (3c).2007337
1056B68
0Removing201Refitting211. Remove the clips (1a) and remove the injectors (1b) from thesingle fuel manifold pipe.2. Remove the seals from the injectors.2007338
Make sure that the ignition key is in theOFF position. Check that: the air conditioning is switchedoff, the accelerator pedal is never pressed and the accelerator cableis correctly positioned (refer to op. 33141321068A30accelerator control cable - r + r ). Connect the tool to the diagnostic socketand place the knob in position 3.Connect the Examiner diagnostic equipment.Connect the Examiner diagnostic equipment.Using the Examiner, enter the "ControlUnit Test" ambient.Place the ignition key in the ON position.Using the Examiner, enter the "ActiveDiagnosis" ambient, then select "Reset self-adjustmentparameters" and "Idle actuator".Using the Examiner, press "Carry outactive diagnosis".Place the ignition key in the OFF positionand wait for 30 seconds.Place the ignition key in the ON positionand wait for 30 seconds.Using the Examiner, re-establish the dialoguewith the engine control system.Using the Examiner, enter the "Parameters"ambient and select the following tests from the menu - "Idle recognitiontest - carried out" and "Idle recognition signals - synchronized".767If at least one of the parametersdoes not conform, place the ignition key in the OFF position andrepeat the procedure. If this non conformity persists, check thatthe diagnostic cable is correctly connected and check the operationof the instrument.Place the ignition key in the OFF positionand wait for 30 seconds.Start up the engine without acting on theaccelerator pedal.Disconnect the diagnostic equipment.Test the vehicle by driving for severalkilometres then, with the engine warmed up, check that it is idlingcorrectly.
1056B82
0Removing201Refitting21 Make sure that the ignition is off (STOPposition), then disconnect the negative battery terminal (referto op. 33148615530B10battery - r+r ). 1. Release and disconnect the electrical connections (1a) and (1b)from the injection/ignition system control unit.2. Undo the nuts (2a) and remove the injection/ignition controlunit (2b).2007339
1056B82
0Removing201Refitting21 Ensure that the ignition key is in OFFposition, then disconnect the battery negative terminal ( 3314861-5530B10battery - r+r ). Proceed with the removal 3315197-7040D14engine bay rear sidecover (one) lh or rh - r r (Right side). 1. Loosen the band (1a) and disconnect the oil vapour recirculationpipe (1b) from the corrugated hose.2. Loosen the bands (2a) and remove the hose between resonator andthrottle body (2b), complete with resonator (2c).2007340
0Removing201Refitting21 Make sure that the ignition is off (STOPposition), then disconnect the negative battery terminal (referto op. 33148615530B10battery - r+r ). 1. Disconnect the electrical connection from the intake air temperaturesensor.2. Undo and remove the intake air temperature sensor.2007791
1056B62
0Removing201Refitting21 Make sure that the ignition is off (STOPposition), then disconnect the negative battery terminal (referto op. 33148615530B10battery - r+r ). Discharge the fuel pressure (see GR 10- WARNINGS).1. Disconnect the electrical connections from the injectors.2007793
0Removing201Refitting21 Make sure that the ignition is off (STOPposition), then disconnect the negative battery terminal (referto op. 33148615530B10battery - r+r ). 1. Disconnect the electrical connection from the altitude corrector. 2. Undo the attachments and remove the altitude corrector.2007796
1056B79
0Removing201Refitting211. Remove the buttons (1a) using the tool (1b) and remove the protection(1c).2. Open the two protective covers (2a) and undo the nuts (2b) underneathfixing the control unit cover.3. Undo the bolts (3a) and remove the control unit cover (3b).2007797
0Removing201Refitting21Position the vehicle on theramp. Make sure that the ignition is off (STOPposition), then disconnect the negative battery terminal (referto op. 33148615530B10battery - r+r ). 3315196-7040D12engine front side cover (one) lh or rh - r r (left). 3315197-7040D14engine bay rear side cover (one) lh or rh - r r (left). Remove the cap with built-in brake fluidlevel switch and drain the brake/clutch fluid from the reservoir usinga suitable syringe.1. Disconnect the comb from the A.B.S. hydraulic and electroniccontrol unit.2. Release the A.B.S. pipes from their clip.3. Disconnect the pipes from the A.B.S. hydraulic and electroniccontrol unit and move them aside.2009904
0Removing201Refitting21 Make sure that the ignition is in the OFFposition, then disconnect the negative battery terminal (refer toop. 33148615530B10battery - r+r ). 1. Undo the bolts (1a) and remove the right and left trims (1b).2009600
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