Poor Gear Shifting Quality

Poor gear shifting quality

Checking diagnostic trouble codes (DTCs)

Hint: Remedy any other diagnostic trouble codes (DTCs) stored for the transmission control module (TCM) first. One of these faults could have caused diagnostic trouble code (DTC) TCM-0100.




- Ignition on
- Read off diagnostic trouble codes (DTCs).





Are other diagnostic trouble codes (DTCs) stored?

Yes - DONE

No - Checking for contact resistance and oxidation

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Checking for contact resistance and oxidation




- Ignition off
- Check the transmission connectors and transmission control module (TCM) connector. Check for contact resistance and oxidation. See Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault
- Reconnect the connectors, reinstall components etc.
- Test drive the car. See Test drive schedule, description, B5244T5, AW55-50/51SN, B5254T2, AW55-50/51SN, B5254T2, AW50/51 AWD Test Drive Schedule, Description.
Check for any clearly audible noises from the transmission. Check for malfunctions.

Other information
- To access the transmission connectors, see Connectors transmission, disconnecting / connecting Procedures
- To access the control module connector, see Transmission control module (TCM), replacing, B5244T5, AW55-50/51SN, B5254T2, AW55-50/51SN, B5254T2, AW50/51 AWD Service and Repair.

Is the transmission operating correctly?

Yes - Fault Found

No - Replacing the control system

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Replacing the control system
Fault-tracing indicates an internal fault in the transmission.
Replace the control system. See Solenoid control system, replacing Solenoid Control System, Replacing.


Continue - Resetting the adaptation and oil quality counter

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Resetting the adaptation and oil quality counter





Resetting the adaptation

Resetting adaptation and the counter for "Transmission oil change"

Hint: The transmission has torque controlled adaptive pressure control. Pressure control means that the transmission regulates the pressure itself during each gear shift. This avoids harsh gear shifting. Each gear shift is evaluated by the control module and stored in the memory. This allows for compensation for wear and tear in the transmission and clutch. It is important that the adaptation in the memory is reset after the transmission has been repaired. This is to ensure normal operation. The oil is replaced during repair; the "Transmission oil change" counter must be reset. If the counter is not reset when the fluid is drained and replaced, there is a risk that a diagnostic trouble code (DTC) will be stored in incorrect circumstances.

Note! This applies only if the transmission or one of the components in the transmission have been replaced.




- Ignition on.
Click on the VCT2000 symbol to reset the adaptation and counter.






Continue - DONE

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DONE - Verification

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Verification




Verification

Verification

Hint: After carrying out the repair, check that the fault has been remedied.








- Ignition off.
- Reconnect the connectors. Reinstall the components.
- Test drive the car according to Test drive schedule, description, B5244T5, AW55-50/51SN, B5254T2, AW55-50/51SN, B5254T2, AW50/51 AWD Test Drive Schedule, Description.





Is the function of the transmission OK?

Yes - VERIFIED

No - VERIFICATION FAILEDPAPER

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VERIFICATION FAILED - Fault-tracing information

VERIFIED - Fault Found

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Fault-tracing information




Information

Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Do you want to exit fault-tracing?

Yes - FAULT-TRACING FAILED

No - Attempt New Test

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FAULT-TRACING FAILED - FAULT-TRACING FAILED

Attempt New Test - Checking for contact resistance and oxidation

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