Slipping or Not Engaged
Slipping or not engaged
Checking the oil quality and the oil level in the transmission
Note! Transmission fluid quality and level are extremely important for transmission function. Therefore it is imperative that these are correct. In addition the oil level is dependent on oil temperature.
- Ignition on
- Read off the oil temperature.
Check the oil level. Check the transmission for leakage if the fluid level is low. Then top up with oil.
Check the quality of the oil.
Check the transmission fluid for metal swarf. Take a sample using the dip stick.
- Replace the transmission if the transmission fluid contains metal swarf
- Replace the transmission fluid if the fluid smells burnt.
Other information:
- Transmission fluid, replacing Transmission Fluid, Replacing
- Oil level, checking Checking Oil Level
- Oil grade, checking, B5254T2, AW55-50/51SN, B5254T2, AW50/51 AWD Oil Grade, Checking
Select an alternative below:
1. No fault detected
2. Transmission fluid replaced, the level was low or quality was poor
3. The transmission fluid contains metal swarf.
1 - Replacing the transmission control system
2 - Resetting the oil quality counter
3 - Replacing the transmission
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Checking for contact resistance and oxidation
- Ignition off
- Check connectors and connections for contact resistance or oxidation.
Measure the resistance on the terminals for solenoid SLU. Check for an open-circuit. Check for a short-circuit to ground.
Remedy as necessary.
Other information
- Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault
- To access transmission connectors, see:
Connectors, transmission, disconnecting / connecting, B5244T5, AW55-50/51SN, B5254T2, AW55-50/51SN, B5254T2, AW50/51 AWD 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
- Solenoid control system, replacing Solenoid Control System, Replacing
Continue - Test driving the transmission
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Replacing the transmission
The previous tests indicate an internal fault in the transmission.
Replace the transmission.
Other information:
- Gearbox, removing Transmission, Removing
- Transmission, installing Transmission, Installation
Continue - Resetting the adaptation and oil quality counter
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Replacing the transmission control system
- Perform the following check.
Test pressurization Testing and Inspection
- Check the cooling system's pipes and connections to the automatic transmission. Check for leakage.
Does the pressure drop?
Yes - Checking the cooling system
No - Checking software
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Resetting the oil quality counter
Resetting Transmission fluid change counter
Resetting Transmission fluid change counter
Hint: The transmission control module (TCM) has a counter for the oil quality. The counter counts up if the transmission is exposed to too high a load or an ambient temperature that is too high. If the counter is not reset when the oil is drained or changed, there is a risk that a diagnostic trouble code (DTC) will be stored in faulty circumstances. Therefore it is important that the "Transmission oil change" counter is reset.
Note! This applies only when the transmission fluid is changed and when the fluid is changed when repairs are carried out to the transmission temperature sensor.
- Ignition on.
Reset the counter by clicking on the VCT 2000 symbol.
Continue - DONE
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DONE - Verification
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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
Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off
- Reconnect the connectors, components, etc.
- Ignition on
Test drive the vehicle following: Test drive schedule, description Test Drive Schedule, Description
During the test drive, oil temperature should be over 20 °C.
Note any deviations in transmission function.
Does the transmission function flawlessly?
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 the oil quality and the oil level in the transmission
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Checking the cooling system
Ensure that the leak is the cause of the coolant coming in contact with the transmission oil by checking the quality of the oil.
If the quality of the transmission fluid had deteriorated due to leakage from the cooling system, replace the transmission, radiator, hoses and expansion tank as below.
Other information:
- Oil grade, checking, B5254T2, AW55-50/51SN, B5254T2, AW50/51 AWD Oil Grade, Checking
- Gearbox, removing Transmission, Removing
- Installing the gearbox Transmission, Installation
- Radiator / charge air cooler (CAC), replacement Radiator / Charge Air Cooler (CAC), Replacement
Select "Continue" when you are ready.
Continue - Resetting the adaptation and oil quality counter
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Checking software
- Check that the control module has the latest version of the relevant software.
- If new software is available, download to the control module and then select Continue.
- If the control module already has the latest software select Continue.
Continue - Test driving the transmission
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Replacing automatic transmissions
Replace the transmission.
Other information:
- Gearbox, removing Transmission, Removing
- Installing the gearbox Transmission, Installation
Continue - REPAIRED
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Test driving the transmission
- Perform the following check.
Other information:
- Test drive schedule, description, B5244T5, AW55-50/51SN, B5254T2, AW55-50/51SN, B5254T2, AW50/51 AWD Test Drive Schedule, Description Test drive schedule, description Test Drive Schedule, Description
Does the problem persist?
Yes - Checking for contact resistance and oxidation
No - Fault Found
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Test driving the transmission
- Perform the following check.
Other information:
- Test drive schedule, description, B5244T5, AW55-50/51SN, B5254T2, AW55-50/51SN, B5254T2, AW50/51 AWD Test Drive Schedule, Description Test drive schedule, description Test Drive Schedule, Description
Does the problem persist?
Yes - Replacing automatic transmissions
No - Fault Found
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