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WIRING DIAGRAM - AUTOMATIC TRANSMISSION - Alfa Romeo 159 2.4 JTD 20V Fino a 12/05
COMPONENTS - AUTOMATIC TRANSMISSION - Alfa Romeo 159 2.4 JTD 20V Fino a 12/05
| Component code | Description | With reference to the assembly |
| B001 | JUNCTION UNIT | |
| B002 | JUNCTION UNIT UNDER DASHBOARD | |
| B099 | MAXIFUSE BOX ON BATTERY | |
| C010 | LEFT FRONT EARTH | - |
| C020 | PASSENGER SIDE DASHBOARD EARTH | - |
| D001 | FRONT/DASHBOARD COUPLING | - |
| D047 | CLOCK SPRING COUPLING | - |
| E050 | INSTRUMENT PANEL | |
| L050 | AUTOMATIC TRANSMISSION SOLENOID VALVES | - |
| M001 | BODY COMPUTER | |
| M053 | AUTOMATIC TRANSMISSION GEAR SELECTOR CONTROL UNIT | - |
| M055 | AUTOMATIC TRANSMISSION CONTROL UNIT | - |
| M089 | STEERING LOCK CONTROL UNIT (NBS) |
COMPONENT LOCATION - AUTOMATIC TRANSMISSION - Alfa Romeo 159 2.4 JTD 20V Fino a 12/05
| Component code | Description | With reference to the assembly |
| B001 | JUNCTION UNIT | |
| B002 | JUNCTION UNIT UNDER DASHBOARD | |
| B099 | MAXIFUSE BOX ON BATTERY | |
| C010 | LEFT FRONT EARTH | - |
| C020 | PASSENGER SIDE DASHBOARD EARTH | - |
| D001 | FRONT/DASHBOARD COUPLING | - |
| D047 | CLOCK SPRING COUPLING | - |
| E050 | INSTRUMENT PANEL | |
| L050 | AUTOMATIC TRANSMISSION SOLENOID VALVES | - |
| M001 | BODY COMPUTER | |
| M053 | AUTOMATIC TRANSMISSION GEAR SELECTOR CONTROL UNIT | - |
| M055 | AUTOMATIC TRANSMISSION CONTROL UNIT | - |
| M089 | STEERING LOCK CONTROL UNIT (NBS) |
The vehicle is equipped with automatic transmission which regulates and controls the automatic engagement of the gears.The 6 speed gearbox, in addition to being compact and light, features a control unit integrated with the transmission and has been designed with special attention paid to limiting consumption.An electronic control unit manages a complex operating logic that allows the use of the gearbox in both sequential conditions, in which the driver manages the engagement of the gears using the lever and, in automatic mode, where the management of the gear changes is delegated to the electronic system.The presence of the transmission control unit makes available the following set of operating modes and specific operational functions:- basic operating mode;- capacity to adapt to operating conditions;- functions designed to improve comfort and fuel consumption.In manual operating mode, the driver can select the gears by pushing the gear lever on the right; at this point a impulse upwards (towards "+") makes it possible to shift to a higher gear whilst an impulse downwards (towards "-") produces a shift to the previous gear.Its ability to adapt to operational condtions allows the vehicle to adapt to the driver''s driving conditions and/or road conditions. The most important are as follows:- up & down slope: this function allows the vehicle to recognise road slopes (upward and downward) and modify gear shift points to achieve the best possible compromise at all times between the driver''s needs, the road conditions and the vehicle situation (speed and engine speed).- Fast off: automatic transmissions normally shift from one gear to the next when the driver raises his foot from the accelerator. This function inhibits this gear shift when the foot is raised quicklyl from the accelerator, limiting the number of gear shifts and increasing driver comfort.- Cornering: this function inhibits gear shifts when the vehicle is cornering in order not to jeopardise vehicle safety.- Neutral control: after the vehicle has been parked with the gear shift lever in position D for a few seconds (e.g. waiting at a green traffic light), this function is activated. It releases the hydraulic clutch inside the transmission to reduce the resistant torque in the torque converter and thus save fuel while reducing the vehicle''s vibration level when idling.- Self-learning to minimise the pulses perceptible to the driver during gear selector operation with the car parked (i.e. shifts from N-R and N-D), it is possible to apply the self-learning procedure to set the band and clutch activation pressures to ensure smoother operation;- Braking assist: this function is activated when the driver brakes and is designed to increase the deceleration of the vehicle by downshifting;- Poor grip: in order to prevent the wheels slipping, during take off in poor grip condtions the gear changes automatically from first to a higher gear.The control unit has its own diagnostic signal used for the continuous monitoring of the entire device.
The automatic transmission control unit M55 controls and regulates the entire gearbox management system.The direct power supply reaches the engine compartment junction unit B1 at pin 11 of connector A of the automatic transmission control unit M55 and at pin 1 of the gear selector contro lunit M53 via a line protected by fuse F18.The ignition controlled supply (15/54) for the steering lock control unit M89 reaches pin 1 of connector A of M55 and pin 2 of the gear selector control unit M53 via the line protected by fuse F24 of the engine compartment junction unit B1.Pin 9 of connector A of M55 is earthed.The gear selector control unit M53, via pins 7-8 and 9-10 and the automatic transmission control unit M55, via pins 8-14 and 7-6, communicate via the C-CAN and interface with pins 36, 37 of connector B of the Body Computer control unit M1.The Body Computer also transmits signals related to the operating status of the transmission to the display on instrument panel E050, via the B-CAN.The reverse gear engaged signal leaves pin 13 of connector A of the automatic transmission control unit M55.Pin 5 of connector A of the automatic transmission control unit M55 is connected directly to pin B4 of the steering lock control unit M89. If the gear lever is in park/neutral, the signal sent ensures that starting is allowed.The gear controls on the steering wheel are connected via the clock spring D47 to the gear selector control unit M53, pins 11 and 12.The pins for connector B of the automatic transmission control unit M55 have a pin-to-pin connection at the pins for the automatic transmission solenoid valve unit 050.The autodiagnostic system for control unit M55 is achieved by connecting to connector C of the Body Computer M1 - pin 7 -: it receives signals from pin 4 of connector A of control unit M55 via the special diagnostic line (K LINE).
