Mechatronic Unit
Mechatronic Unit
Special tools, testers and auxiliary items required
• Puller (T10271)
• Assembly Pin (T40199)
Removing
• Transmission installed.
• Refer to => [ Repair Information ] Repair Information.
• Refer to => [ Clean Working Conditions ] Clean Working Conditions.
• Always replace the Mechatronic unit if it is dirty or faulty.
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.
- Move the selector lever to "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 static 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.
• To make it easier to work, move the selector lever - 3 - for the parking lock emergency release into a vertical position and secure it with a tie wrap - arrow -. The selector slide - 1 - can then engage easier into the claw - 2 - of the emergency release during installation.
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 2 -.
• The bolts - 18, 19 and 20 - were already removed when the hydraulic pulse memory was removed.
• Do not remove the bolts - 1 - yet.
- Install the 4 (T40199) in the threaded holes - 5, 7, 12 and 14 - hand-tight.
- Remove the bolt - 1 -.
Transmission without a Hydraulic Pulse Memory
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 bolts in the following sequence: - 19 to 2 -.
• Do not remove the bolt - 1 - yet.
- Install the 4 (T40199) in the threaded holes - 5, 7, 12 and 14 - hand-tight.
- Remove the bolts - 1 -.
- Remove the transmission output speed sensor (G195) - 4 - from the transmission housing before removing the Mechatronic.
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.
- If still not present, 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 with a Hydraulic Pulse Memory ] Description and Operation.
- Install the hydraulic pulse memory - A -. Refer to => [ Hydraulic Pulse Memory with Accumulator Solenoid (N485) ] Service and Repair.
Transmission without a Hydraulic Pulse Memory
- 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.
All Transmissions
Install in reverse order, paying attention to the following:
There is a risk of destroying the transmission control module (Mechatronic) with static 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 the transmission connector with hands.
- Install the new connector housing - 2 - with the tab downward and then turn it opposite the direction of - arrow -.
- Make sure the connector locks and is secure.
- Tighten the bolt - 1 -.
- Remove the cable tie - arrow -.
- 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 with ATF. Refer to => [ ATF, Checking Level and Correcting ] ATF, Checking Level and Correcting.