AUTOMATIC TRANSMISSION OPERATIONAL DESCRIPTION

Operational Description

Automatic transmission control unit M055 controls and regulates the entire electronic gearbox management system (CAE).

A direct battery power suppy is supplied by body computer node M001 (pin 11 connector B) from a line protected by fuse F23, located inside the control unit, at pin 56 of control unit M055.

An ignition-operated power supply is supplied by engine bay control unit B001 (pin 4 connector C) from a line protected by fuse F04, located inside the control unit, at pin 27 of control unit M055.

Pin 28 of M055 is earthed.

The information is sent, via the CAN, from control unit M055 (from pins 29, 30) to the engine management control units involved M010 and ABS/ESP M050.

Relays J006 (pin 1A) and J007 (1B, 3B) receive an ignition-controlled supply from the line protected by fuse F04, located in junction unit B001.

The other end of the coil for J006 is connected to the solenoid valve unit L050 at pin A5.

When the ignition switch is turned to osition M, the supply reaches pin 3A of relay J006 from pin 3 connector A of H001.

The solenoid valve unit L050 only allows starting in certain conditions (e.g. if the brake pedal is pressed).

A negative signal from the solenoid valve unit L050 energizes the coil for relay J006: in this way a supply arrives from the line for pin A5 of J006 energizing the starter motor A020

See E5010 STARTING AND RECHARING

The starting command is only supplied when the control unit M055 receives the "brake pedal pressed" signal at pin 43 coming from switch I030 and when there is no "brake pedal released" signal at pin 16 coming from switch I035.

The brake pedal pressed signal comes from the brake pedal switch I030, connected to the body computer node M001 at pin 2 of connector B and is supplied directly by the ignition switch H001.

Switch I035 receives a supply from the ignition-controlled line protected by fuse F18 of the body computer M001.

there is a second "redundant" switch on the brake pedal: the "basic" switch (I030) is the "normally open" type (when the pedal is pressed, the switch closes), whilst the "redundant" switch (I035) is the "normally closed" type (when the pedal is pressed, the switch contact opens): the system checks the consistency of the "pedal pressed" information in this way.

Relay J007 supplies the automatic transmission lever lock solenoid L058 when electronic control unit M055 excites the relay coil via a negative signal from pin 11.

The internal contact of the relay closes and the ignition-operated power supply received at pin 3B is sent on to electromagnet L058 from pin 5B.

The KEY LOCK signal (engine immobilizing if the gearbox is not in P or N) is sent by control unit M055, from pin 3 to the body computer node M001, pin 36 of connector M.

The solenoid valve unit L050 receives an ignition-controlled supply at pin A1 of the engine compartment junction unit B001 (pin 10 connector C) from the line protected by fuse F04, located in the junction unit; pin A4 is earthed.

The reverse gear engaged signal is sent from pin A2 to the body computer node M001 (pin 5 connector B) which controls the switching on of the reversing lights

See E2022 REVERSING LIGHTS

All the other pins are connected to the automatic transmission control unit M055; control unit M055 communicates directly through numerous signals with the solenoid valve unit L050 which contains the control valves, pressure regulators and some sensors.

The management of the gearbox can be fully automatic (i.e. managed completely by control unit M055) or semi-automatic, in other words setting the gears through the gear lever, switch unit H037 connector B; the latter receives a supply from the body computer node M001 (pin 6 connector F) from the line protected by fuse F18 located in the junction unit. The control unit is informed, from unit H037 connector B, of the automatic or manual management, at pins 36 and 37 of M055.

The engagement of the "snow" function by pressing the special button in unit H037 connector A, is communicated to the body computer M001, at pin 16 connector L and from there to the control unit M055, via the CAN.

The LED to show that the function is on is supplied by the line protected by fuse F12 located in the body computer.

Control unit M055 sends the required information, via the CAN, to instrument panel E050 and odometer warning light node M140 for the management of the warning lights and the gears engaged display.

The control unit autodiagnostic data can be read by connecting to the diagnostic socket.

The automatic transmission control unit M055 is connected, via the K line, from pin 18 to the diagnostic socket R010, pin 7; it is also connected through diagnostic line L, from pin 17 of M055 to pin 15 of R010

See E8010 DIAGNOSTIC MULTIPLE CONNECTOR

2.0 16V JTD, 2.2 16V JTD · MY 2005

Automatic transmission control unit M055 controls and regulates the entire gearbox management system.

The power supply for the automatic transmission control unit M055 (pin 56) is provided by the Body computer node M001 (pin 11 connector B) and (pin 27) from the engine compartment junction unit B001 (pin 4 connector F) through a line protected by fuse F06.

This latter line, also supplies the gear control unit H037 (pin 1 connector B) and the automatic transmission solenoid valve assembly L050 (pin A1).

The information is sent via the CAN line from control unit M055 (pins 29-30 for the basic version and pins 29-30, 38-29 for the version with ESP) to the Body computer node M011 (pins 8, 10 connector D), to the engine compartment junction unit B001 (pins 11, 12 connector F), to the instrument panel E050 (pins 6, 12), to the milometer and warning lights control unit M140 (pins 2, 5) and to the other control units involved: engine management M010 and ABS/ESP M050.

See E1050 CAN CONNECTION LINES

The Body computer node M001 (pins 1, 2 connector A) receives a power supply from the engine compartment junction unit B001 (pins 4, 5 connector D respectively) through two lines protected by fuses MF4 and MF5 (respectively) and provides a power supply (pin 6 connector D) for the instrument panel E050 (pin 13) and the milometer and warning lights control unit M140 (pin 4) through a line protected by fuse F14.

The ignition switch H001 is connected (pins 2, 1, 3 respectively) to the body computer M001 (pin 5 connector D, pins 4 and 6 connector G).

The gear lever lock actuator relay feed J007 (pins 1B, 5B) receives a power supply from the Body computer node M001 (pin 10 connector B).

This same actuator J007 (pins 2B, 3B respectively) is still connected to the automatic transmission control unit M055 (pin 11) and to the automatic transmission lever lock solenoid L058 (pin 1).

The solenoid valve unit L050 only allows starting in certain conditions (e.g. if the brake pedal is pressed).

The brake pedal switch I030 is connected:

- at pin 1, to the additional fuse box B098 (pin G31 connector B) from which it receives a power signal via a line protected by fuse F31;

- at pin 2, to the Body computer node M001 (pin 4 connector B) and to the automatic transmission control unit M055 (pin 43).

The KEY LOCK signal (locking of starting if the gearbox is in a position other than P or N), is supplied by the automatic transmission solenoid valve assembly L050 (pin A5) to junction unit B001 (pin 15 connector F).

Once the brake pedal pressed and gearbox in position P or N signal is received, the junction unit B001 commands starting (pins 2, 3 connector C).

See E5010 STARTING AND RECHARING

The automatic transmission control unit M055 (pins 15, 31, 32, 33, 42, 53, 54, 14, 13, 8, 7, 1, 9, 10, 20, 19, 26, 25, 55, 24, 46, 45, 12, 2) communicates with the solenoid valve assembly L050 (pins A3, A10, A11, A12, A7, B4, B1, B2, B5, B7, B10, B3, B8, B11, B9, B6, B12, C3, C2, C1, D2, D1, E2, E1) by means of numuerous signals: the latter contains the control valves, the pressure regulators and several sensors.

The management of the transmission may be completely automatic (managed by M055) or semi-automatic, in other words setting the gears by means of the gear control unit H037: pins 4 and 5 of connector B are connected to pins 37 and 36 (respectively) of the automatic transmission control unit M055 informing it of the management to be carried out.

The engagement of the "snow" function takes place by pressing the special button located in unit H037 (pin 1 connector A) connected to the Body computer node M001 (pin 5 connector I).

The Body computer node M001 notifies control unit M055 (via the CAN line) that the function has been switched on and supplies (pin 7 connector D) the LED in the gear control unit H037 (pin 2 connector A).

The autodiagnosis of the control unit M055 (pin 18) can be carried out by connecting to the diagnostic socket R010 (pin 7).

See E8010 DIAGNOSTIC MULTIPLE CONNECTOR