Transmission Fluid Level, Checking

Special tools and workshop equipment required 

• Tools for Transmission Fluid Change. Refer to TOOLS FOR TRANSMISSION FLUID CHANGE .

Procedure 

Test Conditions

• Transmission not in emergency operation mode.
• Move the vehicle onto a four-column workshop hoist or over a work pit so it is completely level.
• Selector lever in "P".
• The parking brake button is pulled to activate the electro-mechanical parking brake.
• Suction hoses from an exhaust extracting system are connected.
• Engine running at idle.
• The A/C system and the heater are off.

Transmission Fluid Temperature, Reading

• The transmission fluid level changes with the transmission fluid temperature: too low of a transmission fluid temperature leads to overfilling, and too high of a transmission fluid temperature leads to underfilling.
• An incorrect transmission fluid filling impairs the transmission function.
• The transmission fluid temperature must not be higher than 30 °C (86 °F) when starting the procedure. Let the transmission cool down if necessary.
• Test temperature: 35 to 45 °C (95° to 113 °F).

-- Connect the Vehicle Diagnostic Tester and select Individual test  .

• Dual clutch transmission 0GC
• 01 - OBD-capable systems
• 02 - Transmission electronics
• 02 - Transmission electronic functions
• 02 - Oil level, checking

Transmission Fluid Level, Checking

-- Bring the transmission fluid temperature to approximately 30 °C (86°F).

-- Remove the noise insulation. Refer to OVERVIEW - NOISE INSULATION .

-- Place the : SMN372500  under the transmission.

• The engine is idling and the selector lever is in "P".

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-- Remove the check plug -arrow-.

• The collected transmission fluid runs out of the overflow pipe -arrow 2-.
  Fig 1: Identifying Overflow Pipe And Plug

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• Some gear oil always leaks out when opening the inspection plug -arrow 1-, regardless of the gear oil level.

-- Loosen the overflow pipe two turns.

• If some transmission fluid still leaks out at a transmission fluid temperature between 35 and 45 °C (95 to 113 °F) (due to additional warming), the transmission fluid level is OK.
• Regardless of the gear oil level, a small wave of fluid comes out of the overflow tube every 30 seconds due to the multi-plate clutch cooling oil pulse. This procedure is irrelevant for checking gear oil level.
• Do not reuse transmission fluid that was drained.

-- If necessary, add transmission fluid. Refer to TRANSMISSION FLUID, DRAINING AND FILLING .

-- If the transmission fluid level is OK, tighten the overflow pipe and then perform a measurement. Refer to Final Procedures  below.

Final Procedures 

• Replace the check plug seal -arrow-.

-- Remove the : VAS6262A  from the transmission.

-- Tighten the overflow pipe.

-- Tightening the check plug -arrow-.

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Tightening Specifications 

• Refer to OVERVIEW - DRAIN AND CHECK PLUGS 
• Refer to OVERVIEW - NOISE INSULATION .