Mechatronic Unit

Mechatronic Unit

Special tools, testers and auxiliary items required

• Puller (T10271)

• Assembly Pin (T40199)

Removing

• Transmission installed.

• General repair instructions, refer to => [ Repair Information ] Repair Information.

• Clean working conditions for the automatic transmission, refer to => [ Clean Working Conditions ] Clean Working Conditions.

• Always replace the Mechatronic unit if it is dirty or defective.

There is a risk of damaging the transmission.

• Do not start the engine if there is no ATF in the transmission and if the Mechatronic is removed.

- Transmission in "P".

- Turn off the ignition and remove the key.

- Remove the ATF oil pan. Refer to => [ Automatic Transmission Fluid Oil Pan ] Service and Repair.

- Remove the ATF filter. Refer to => [ ATF Filter ] Service and Repair.

There is a risk of destroying the transmission control module (Mechatronic) with electrostatic discharge.

• Always "discharge" the static electricity. Do this by touching a grounded object, for example vehicle ground, the vehicle or the hoist.

• Do not touch contacts in transmission connector with hands.

- Disconnect the connector on transmission by rotating screw connections counter-clockwise - arrow -.

- Remove the bolt - 1 -.

- Turn the connector housing - 2 - counter-clockwise - arrow - and remove it.

- Remove the ATF oil pan. Refer to => [ Automatic Transmission Fluid Oil Pan ] Service and Repair.

- Remove the ATF filter. Refer to => [ ATF Filter ] Service and Repair.

Transmission with a Hydraulic Pulse Memory - A -:

Risk of causing damage to the Mechatronic.

• Only the bolts with a T40 Torx(R) bolt head may be loosened.

• If other bolts are loosened, this may affect the function of the Mechatronic unit or it may come apart.

- Remove the hydraulic pulse memory - A -. Refer to => [ Hydraulic Pulse Memory with Accumulator Solenoid (N485) ] Service and Repair.

- Remove the bolts in the following sequence: - 21 to 1 -.

• The bolts - 18, 19 and 20 - were already removed when the hydraulic pulse memory was removed.

Transmission without a Hydraulic Pulse Memory:

- Remove the bolts in the following sequence: - 19 to 1 -.

Risk of causing damage to the Mechatronic.

• Only the bolts with a T40 Torx(R) bolt head may be loosened.

• If other bolts are loosened, this may affect the function of the Mechatronic unit or it may come apart.

Continuation for All Transmissions:

- Remove the Mechatronic.

Danger of damaging the sensor on the back side of the Mechatronic.

• Lay the Mechatronic with the bolt head side facing down only.

Installing

• For the correct tightening specifications, refer to => [ ATF Pan, ATF Screen, Mechatronic and Hydraulic Pulse Memory with Accumulator Solenoid (N485) Overview ] Description and Operation.

• Replace the Mechatronic O-rings and bolts.

- Install new O-rings - 1 and 3 - into the grooves in the oil pipes.

- Install the ATF pipe - 2 - into the Mechatronic.

- Check the oil pipes for damage and make sure they fit securely inside the Mechatronic.

- Remove the sealing sleeve using the (T10271) and install a new sleeve.

- Install the four (T40199) hand-tight, as illustrated.

• The (T40199) prevent the Mechatronic from tilting when it is being installed. Also, the oil pipes on the back of the Mechatronic will not get damaged.

• The spring clip on the back of the Mechatronic prevents the Mechatronic from being mounted flush on the transmission housing.

• It is recommended to have a second technician help when installing the Mechatronic.

- Mount the Mechatronic on the transmission housing.

• The claw - 2 - on the emergency release must fit behind the pin in the selector slider - 1 - - arrow -.

Transmission with a Hydraulic Pulse Memory - A -:

- Install the bolts - 1 through 4 - by hand until the bolt heads make contact.

- Remove the four (T40199).

- Tighten the bolts on the Mechatronic in the specified tightening sequence. Refer to => [ Tightening Specification and Sequence for Mechatronic without a Hydraulic Pulse Memory ] Description and Operation.

Continuation for All Transmissions:

Install in reverse order, paying attention to the following:

There is a risk of destroying the transmission control module (Mechatronic) with electrostatic discharge.

• Always "discharge" the static electricity. Do this by touching a grounded object, for example vehicle ground, the vehicle or the hoist.

• Do not touch contacts in transmission connector with hands.

- Make sure the connector locks and is secure.

- Install the ATF filter. Refer to => [ ATF Filter ] Service and Repair.

- Install the ATF pan. Refer to => [ Automatic Transmission Fluid Oil Pan ] Service and Repair.

- Fill the ATF. Refer to => [ ATF, Checking Level and Correcting ] ATF, Checking Level and Correcting.