ATF Level, Checking
Special tools and workshop equipment required
- Vehicle Diagnostic Tester
- Used Oil Collection and Extraction Unit SMN372500
- Protective eyewear
Danger of causing damage to the transmission.
- Only use replacement part ATF for the S tronic transmission 0B5.
- Pay attention to allocation.
- Using other types of ATF can result in the malfunctions or transmission failure.
- The ATF filler tool must be clean and the ATF must not be mixed with any other oils.
- Read the ATF temperature on the Vehicle Diagnostic Tester.
- The ATF level will vary depending on the temperature of the ATF.
- It is possible to overfill the ATF if the level is checked when the temperature is too low.
- It is possible to underfill the ATF if the level is checked when the temperature is too high.
- Overfilling or underfilling will influence the function of the transmission.
Test Conditions
- The transmission must not be in the emergency running
- Move vehicle onto a four-pillar shop hoist or over a work pit so that it is absolutely horizontal.
- The selector level is in "P".
- The parking brake button should be activated to close the electro-mechanical parking brake.
- Intake hose of an exhaust extraction system connected.
- The Air Conditioning (A/C) and the heater are off.
- Vehicle Diagnostic Tester is connected.
- The ATF temperature should not be higher than approximately 30 °C (86 °F) at the beginning of the test, because during the test the ATF temperature will raise.
ATF Level, Checking
-- Select the following menu items in Functions/Component selection "Guided Fault Finding " on theVehicle Diagnostic Tester:
- Drivetrain
- 0B5 - Transmission
- 01-OBD-Capable Systems
- 02-Transmission Electronics
- 02-Transmission Electronics, Functions
- 02-Measured Values
-- Select Transmission Fluid Temperature from the list.
-- Check the ATF temperature.
Danger of causing damage to the transmission.
- Engine must not be started if only a small amount or no ATF is in the transmission after repair work or after significant ATF loss.
- In this case, pre-filling is necessary. Refer to ATF, DRAINING AND FILLING .
-- Remove the rear noise insulation -2-. Refer to NOISE INSULATION, REMOVING AND INSTALLING .
-- Start the engine with the selector lever in "P".
-- While pressing the brake pedal and with the vehicle idling, shift through all the selector lever positions ("P", "R", "N", "D", "S" or "D/S") leaving each position engaged for at least 2 seconds.
-- Move the selector lever into "N".
-- Move the selector lever into "P".
-- Run the engine at idle.
-- Place the Used Oil Collection and Extraction Unit SMN372500 under the transmission.
Danger of eye injury.
- Wear protective eyewear.
-- When ATF temperature of 30 °C (86 °F) is reached, unscrew ATF inspection plug -arrow-.
- ATF level is correct when at an ATF temperature between 30 °C and 50 °C (86 °F and 122 °F) a small amount of fluid drips out of the inspection hole. If this is not the case, add ATF. Refer to ATF, DRAINING AND FILLING .
ATF inspection opening must be closed again by 50 °C (122 °F) at the latest.
Tightening Specifications
- Refer to
-- Tighten the ATF check plug, tightening specification: 45 Nm .
-- Install the noise insulation. Refer to NOISE INSULATION, REMOVING AND INSTALLING .