4301IN Bleeding and filling the levelling system

WM 4301IN Bleeding and filling the levelling system

Tools





Technical values





Instructions for working on vehicles with an empty air suspension system in the workshop

Information

Vehicles that have been raised with the air suspension system empty must not be set back down on their wheels and driven.

- Raising a vehicle with empty air-spring struts creates a vacuum in the air springs. The air-spring strut bellows may develop creases after the vehicle has been set back down on the floor. This can result in the premature failure of the air-spring struts when the vehicle is raised again.

- If the vehicle has been driven with one or more empty air springs, these air springs must be replaced.

- The vehicle can be manoeuvred in the workshop even if it has one or more empty air springs.

- Absolute cleanliness is essential when working on air suspension systems.

Procedure for vehicles with an empty air suspension system

Vehicles that come into the workshop with a faulty or empty/partially empty air suspension system must be refilled as required after the vehicle has been raised, depending on the type of fault (use compressed gas bottle of nitrogen, connecting line 9825/1, adapter 9825 ).
- In other words: The air suspension system must be filled when the work is complete and before the vehicle is set back down on the floor. This prevents damage to any of the air-spring struts in the vehicle that are not defective.

Procedure for vehicles that have not yet been handed over to customers (prior to sales check)

Conditions
- Vehicle, which has not yet been handed over to the customer, is raised on the lifting platform.
- Vehicle, which has not yet been handed over to the customer, is in transport mode.
- Air suspension system is empty.
- Fill the air suspension system as described below under "Bleeding and filling one axle" and "Bleeding and filling the entire air suspension system and pressure accumulator".

Following vehicle handover, transport mode can be disabled using the Porsche System Tester.
- Vehicle handover: Porsche System Tester >>Control unit overview >>F7 - Additional menu]]Vehicle handover[[.
- Transport mode: Porsche System Tester >>Control unit overview>>Levelling system/PASM>>Actual values/Input signals]]Transport mode[[.

Bleeding and filling one axle

Bleeding an air spring without any loss of system air

This function is used for bleeding when working on an air spring or the lines for an air spring. The air from two air-spring struts is the most that can be accommodated in the pressure accumulator.

Switch off levelling system:
- Switch on ignition.
- Press the High Level button for at least => Time: +10 sec..
1. Raise the vehicle. -> 4X00IN Lifting the vehicle Service and Repair

Bleeding
2. Select ]]Levelling system/PASM [Maintenance/repairs] Bleeding axle by axle[[ in the control unit overview. Select the relevant axle and follow the instructions on the Porsche System Tester.

Filling
1. After completing the work, select ]]Levelling system/PASM [Maintenance/repairs] Filling air suspension system/individual components[[ in the control unit overview and follow the instructions on the Porsche System Tester.
2. Set the vehicle down on its wheels and calibrate the air suspension system. -> 430115 Calibration Programming and Relearning

Bleeding and filling the entire air suspension system and pressure accumulator

Information

Only nitrogen 5.0 may be used for filling the air suspension system. Available under the part number: 999.917.303.01.

- Use a compressed gas bottle with a corresponding pressure reducer unit and pressure gauge.

- Fill the air suspension system to at least => Pressure: +10 bar+1 bar.

- Fill the air suspension system to max. => Pressure: +17 bar

- Wheels must be suspended freely.

- Switch on ignition.

- Adapter 9825 and connecting line 9825/1 must be used.

- The air suspension system is filled using the pressure accumulator.

- Observe correct tightening torques. Specifications
Bleeding the entire air suspension system and pressure accumulator with partial loss of system air

This function is used for bleeding when working on the system and/or the pressure accumulator. Some of the system air is lost in the process.

Bleeding
1. Select ]]Levelling system/PASM [Maintenance/repairs] Vent total air suspension system[[ in the control unit overview and follow the instructions on the Porsche System Tester.

Filling
2. When the work is complete, have the compressed gas bottle with the relevant pressure reducer unit, pressure gauge and adapter ready.
3. Connect the compressed gas bottle to the pressure accumulator and set the pressure => Pressure: 17 bar to the max. setting (shown as an example!)





Pressure of 17 bar at most (shown by way of example)

4. Select ]]Levelling system/PASM [Maintenance/repairs] Filling air suspension system/individual components[[ in the control unit overview and follow the instructions on the Porsche System Tester.
5. Once you have filled the system successfully, remove the compressed air bottle and adapter.
6. Set the vehicle down on its wheels and calibrate the air suspension system. -> 430115 Calibration Programming and Relearning