Transmission Issues in 2021
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79 Posts
SW version: you can check this with the Multiecuscan, or with the factory tool from your dealer.
Fact that the car is ok for 45 Km is proof that nothing is wrong with the gearbox.
Problem is with the robot and your dealer will propose to change the complete robot because this is recomended by the factory.
To check:
SW update for TCU
Actuator test for all gears
Check hydraulic pressure during these tests. It should not drop under 42 bar. Hydraulic pump should run when opening door, pressure should go up to 52 bar. With engine off, contact on en brake pedal on, switch gears from N to 1 to R and back to N. Monitor hydraulic pressure. When prussure is under 42 bar, the pump should run again. If not, problem with hydraulic elektric motor, pressure sensor or accumulator. (hydraulic power unit)
If all this is OK, run the complete calibration procedure but I would suggest to change the oil and filter of the hydraulic system befor doing that.
Al these tests can be done only with OBD tool, e.g. Multiecuscan.
Fact that the car is ok for 45 Km is proof that nothing is wrong with the gearbox.
Problem is with the robot and your dealer will propose to change the complete robot because this is recomended by the factory.
To check:
SW update for TCU
Actuator test for all gears
Check hydraulic pressure during these tests. It should not drop under 42 bar. Hydraulic pump should run when opening door, pressure should go up to 52 bar. With engine off, contact on en brake pedal on, switch gears from N to 1 to R and back to N. Monitor hydraulic pressure. When prussure is under 42 bar, the pump should run again. If not, problem with hydraulic elektric motor, pressure sensor or accumulator. (hydraulic power unit)
If all this is OK, run the complete calibration procedure but I would suggest to change the oil and filter of the hydraulic system befor doing that.
Al these tests can be done only with OBD tool, e.g. Multiecuscan.
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17 Posts
Hi again,
the mechanic dies his best and check everything! During the tests the transmission is getting worse!
When we strart the car and i don t have any issue, the car the gearbox can t change easy the gears! It has many delays!
so, maybe I have to change it!
the mechanic dies his best and check everything! During the tests the transmission is getting worse!
When we strart the car and i don t have any issue, the car the gearbox can t change easy the gears! It has many delays!
so, maybe I have to change it!
Joined
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79 Posts
OK, Whil monitoring the pressure, shift gears with pannel bottons, from N to 1 to N to R to 1, a couple of times. The pressure should stay between 44 and 54 bar. If that is OK that means that the power unit is ok.
you probably will have to change the robot unit but first I would try to change the oil of the hydraulic unit.
So, depressure the accumulator power unit with the procedure from the Multiecuscan.
Than remove the filter from the robot and flush the oil. Change the filter and put new oil.
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Follow the complete prosedure as descibed above
in the folowing order: delete statistical data, than clutch drain 3 times, clutch replacement, electropump replacement, actuator base adjustment, production service final calibration and finaly clutch self calibration enable. If that is not solving the issue, you have to change the complete robot unit. (since there are no single spare parts available....)
you probably will have to change the robot unit but first I would try to change the oil of the hydraulic unit.
So, depressure the accumulator power unit with the procedure from the Multiecuscan.
Than remove the filter from the robot and flush the oil. Change the filter and put new oil.
Follow the complete prosedure as descibed above
in the folowing order: delete statistical data, than clutch drain 3 times, clutch replacement, electropump replacement, actuator base adjustment, production service final calibration and finaly clutch self calibration enable. If that is not solving the issue, you have to change the complete robot unit. (since there are no single spare parts available....)
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79 Posts
To find faults you have to be able to exclude certain things such as the robot, the clutch or the gearbox.
To exclude the clutch, the engine must be taken out. Before making this drastic choice, it is better to do a number of tests first. The strategy and sequence of these tests is very important. The multiecuscan can also be used to test whether the even and odd gears can be taken properly in the TAB actuators. during this test, gear changes are much slower because the engine is not running. This is normal. If this test passes, you are at least sure that the gearbox and the robot are functioning properly. If errors still occur, the cause is usually due to the calibration and it must be recalibrated. It is important that you follow the procedure strictly and that the engine and clutch are at operating temperature. An Alfa romeo certified technician knows very well how to do this procedure. These tests can also be done with the Alfa service OBD tool.
To exclude the clutch, the engine must be taken out. Before making this drastic choice, it is better to do a number of tests first. The strategy and sequence of these tests is very important. The multiecuscan can also be used to test whether the even and odd gears can be taken properly in the TAB actuators. during this test, gear changes are much slower because the engine is not running. This is normal. If this test passes, you are at least sure that the gearbox and the robot are functioning properly. If errors still occur, the cause is usually due to the calibration and it must be recalibrated. It is important that you follow the procedure strictly and that the engine and clutch are at operating temperature. An Alfa romeo certified technician knows very well how to do this procedure. These tests can also be done with the Alfa service OBD tool.
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17 Posts
We have done everything and now i take the car to test it! I dont feel to have problem with the change of gears! The battery its ok, we clean everything and we change the liquid!
the previous time i testedthe car, it was ok for about 200km and then the problem appeared again!
Also i dont have problem to change the gears from 1 to N to 1 to R.
How many km I have to do in order to understand if the problem fixed or not!
the previous time i testedthe car, it was ok for about 200km and then the problem appeared again!
Also i dont have problem to change the gears from 1 to N to 1 to R.
How many km I have to do in order to understand if the problem fixed or not!
4C SE, Giulietta Vel, 147, Sud, Guzzi 1100 Sport, Guzzi Le Mans MkV
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13,966 Posts
I’d give it 100km. Then you’ll know pretty surely that the problem is solved.
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79 Posts
The self-learning procedure is now activated, my suggestion is NOT to follow the procedure in the service manual but to drive in automatic mode for about 100 - 200 Km. If no errors come up then everything should be fine. It can also help to print out the parameters of the clutch and then compare them after calibration, but then you really need a lot of experience to interpret them correctly.... Best is to drive a mix of city and highway in automatic Natural mode. Good luck!
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79 Posts
the chance that it has to do with the temperature is very small. In racing conditions that may play a role, but even then I estimate the chance to be very small. Contaminated oil in the robot causes difficult movement and even blocking of the actuators and shifter. Am sure this was the cause.
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