Transmission Fluid Level, Checking: Notes

Special tools and workshop equipment required 

• Refer to TOOLS FOR TRANSMISSION FLUID CHANGE 

Procedure 

• Pay attention to Refer to REPAIR INFORMATION .
• Pay attention to Refer to GUIDELINES FOR CLEAN WORKING CONDITIONS .
• Read the "Oil, Environmental and Disposal Regulations" general information. Refer to GENERAL REPAIR INFORMATION .

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.
• "P" position is engaged.
• The parking brake button is pulled on to activate the electromechanical 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 oil temperature must be approximately 30 °C (86 °F) when starting the procedure.

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

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• Diagnostic-capable systems
• 0002 - Transmission electronics
• 0002 - Transmission electronics functions
• 0002 - Fluid level, checking

Transmission Fluid Level, Checking 

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

• The transmission has an inner fluid container, which must be ran dry before checking.

-- Wait approximately four minutes until the inner fluid container has run dry.

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

-- Place the Used Oil Collection and Extraction Unit: SMN372500  under the transmission.

• Engine is idling and the "P" position is engaged.

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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.

• If some transmission fluid still leaks out at a transmission fluid temperature between 35 and 45 °C (95 and 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 the transmission fluid level.
• Leaked gear oil must not be reused.

-- If necessary fill the transmission fluid. Refer to Transmission Fluid, Filling .

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