Check the Transmission Oil Quality
Check the transmission oil quality
Check the transmission oil quality
Check the quality of the transmission oil
Check the quality of the transmission oil
Note! The transmission fluid quality is extremely important for transmission function. Therefore it is imperative that this is correct.
- Ignition off.
Check the transmission oil quality. Take a sample using the dip stick.
- Replace the transmission fluid if it smells burnt
- Replace the fluid and filter if the transmission fluid contains particles
- Check if there is oil or an oil film in the expansion tank. Oil in the expansion tank indicates leakage from the transmission oil cooler which is positioned in the cooler unit.
Note! The transmission oil is red and must not be confused with black engine oil.
- If the transmission fluid is cloudy or pink, it is contaminated with coolant. In such cases the transmission must be replaced. For checking coolant in transmission oil, see: Checking for coolant in the oil, AW55-50/51SN, AW50/51 AWD, 4T65EV-GT Checking For Coolant In the Oil
When replacing the transmission, the cooler unit, including the additional cooler must be replaced if installed. Replace the hoses between the cooler and the transmission.
Other information:
- To replace the transmission fluid and filter, see Gearbox fluid, replacing Removal and Replacement.
Select an option:
1. The fluid contains water
2. The fluid smells burnt or contains particles
3. No fault detected.
1 - WATER
2 - BURNT
3 - NOFAULT
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WATER - Replacing the transmission
BURNT - Resetting the oil quality counter
NOFAULT - No Fault Found
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Replacing the transmission
Replace the transmission. See Gearbox, removing Gearbox, Removing and Gearbox, installing Gearbox, Installing.
Select "Continue" when the fault has been remedied.
Continue - Resetting the adaptation and oil quality counter
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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 - FAULT FOUND
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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 - FAULT FOUND
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