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Home >> Porsche >> 2016 >> Panamera GTS >> Repair and Diagnosis >> Suspension >> Electronic Suspension >> 43 - Level Control, Air Suspension -- PANAMERA (970) >> WM 430149 Troubleshooting The Levelling System (Except PANAMERA Executive, PANAMERA GTS, PANAMERA Turbo S, PANAMERA 4 Executive, PANAMERA Platinum Ed., PANAMERA 4 Platinum Ed.) >> Troubleshooting

WM 430149 Troubleshooting The Levelling System (Except PANAMERA Executive, PANAMERA GTS, PANAMERA Turbo S, PANAMERA 4 Executive, PANAMERA Platinum Ed., PANAMERA 4 Platinum Ed.): Troubleshooting

Component arrangement - air suspension → WM 4301IN POSITION OF AIR SUSPENSION COMPONENTS 

  1. Troubleshooting air-spring dampers and the levelling system 
    Symptom Fault detection Possible causes Solution
    Gradual loss of pressure
    • Vehicle lying to one side after a long time
    • Longer than average regulating times
    • No reaction to driver's request
    		 Observe vehicle height over a long period of time and try to find leak using a commercially available leak detection spray Leak in air-spring strut/air spring Replace air-spring strut/air spring → 433019 REMOVING AND INSTALLING FRONT AIR-SPRING STRUT  or carry out repairs → 433037 DISASSEMBLING AND ASSEMBLING FRONT AIR-SPRING STRUT , replace rear air spring → 434319 REMOVING AND INSTALLING REAR AIR SPRING , → 4301IN BLEEDING AND FILLING THE LEVELLING SYSTEM 
    Leak in air lines or valve unit Check tightening torques for air line connections, check insertion depth of air lines (color marking), replace air line
    Symptom Fault detection Possible causes Solution
    Vehicle lying to one side
    • No leaks in the system
    		 Carry out Guided Fault Finding using the Porsche System Tester Vehicle level sensor faulty Replace vehicle level sensor
    → 431855 REPLACING FRONT LEVEL SENSOR   →  431955 REPLACING REAR LEVEL SENSOR  
    Linkage or holder for vehicle level sensor is bent
    Symptom Fault detection Possible causes Solution
    Vehicle is too high
    • Vehicle cannot be lowered
    		 1.) Check that the vehicle has sufficient ground clearance Vehicle position is raised Look for signs of damage and check clearance around the air-spring struts/air springs and anti-roll bars
    2.) Check air line and line routing Air line blocked, kinked or frozen Replace kinked air lines; carefully blow out frozen and blocked air lines using compressed air
    3.) Valve unit blocked Dirt in valve unit Replace valve unit → 432355 REPLACING VALVE UNIT (LEVELLING SYSTEM) 
    4.) Compressor/valve block blocked Dirt in compressor/valve block Replace compressor → 431519 REMOVING AND INSTALLING COMPRESSOR FOR LEVELLING SYSTEM 
    5.) Carry out Guided Fault Finding using the Porsche System Tester Check relays, plug contacts, wire harness and fuses in the vehicle electrical system
    Drain valve in the compressor faulty/leaking/open    		 Replace compressor → 431519 REMOVING AND INSTALLING COMPRESSOR FOR LEVELLING SYSTEM 
    Drain valve in compressor or control valves in valve block do not work
    Valve unit does not work    		 Replace compressor → 431519 REMOVING AND INSTALLING COMPRESSOR FOR LEVELLING SYSTEM 
    6.) Check fuse in compressor Compressor fuse faulty Replace compressor → 431519 REMOVING AND INSTALLING COMPRESSOR FOR LEVELLING SYSTEM 
    7.) If no faults were found after carrying out Step 6.), the compressor is faulty Compressor faulty Replace compressor → 431519 REMOVING AND INSTALLING COMPRESSOR FOR LEVELLING SYSTEM 
    Symptom Fault detection Possible causes Solution
    Vehicle is too low
    • Vehicle cannot be raised or can only be raised very slowly
    		 1.) Check that the vehicle has sufficient ground clearance Vehicle position is raised Look for signs of damage and check clearance around the air-spring dampers and anti-roll bars
    2.) Check air line and line routing Air line blocked, kinked or frozen Replace kinked air lines; carefully blow out frozen and blocked air lines using compressed air
    3.) Valve unit blocked Dirt in valve unit Replace valve unit → 432355 REPLACING VALVE UNIT (LEVELLING SYSTEM) 
    4.) Compressor/valve block blocked Dirt in compressor/valve block Replace compressor → 431519 REMOVING AND INSTALLING COMPRESSOR FOR LEVELLING SYSTEM 
    5.) Carry out Guided Fault Finding using the Porsche System Tester Check relays, plug contacts, wire harness and fuses in the vehicle electrical system
    Drain valve in the compressor faulty/leaking/open    		 Replace compressor → 431519 REMOVING AND INSTALLING COMPRESSOR FOR LEVELLING SYSTEM 
    Drain valve in compressor or control valves in valve block do not work Replace compressor → 431519 REMOVING AND INSTALLING COMPRESSOR FOR LEVELLING SYSTEM 
    6.) Fault in compressor Compressor fuse faulty Replace compressor → 431519 REMOVING AND INSTALLING COMPRESSOR FOR LEVELLING SYSTEM 
    7.) If no faults were found after carrying out Step 6.), the compressor is faulty Compressor faulty Replace compressor → 431519 REMOVING AND INSTALLING COMPRESSOR FOR LEVELLING SYSTEM 
    Symptom Fault detection Possible causes Solution
    Rapid loss of pressure Vehicle lying to the left or right; when you try to switch to a different level, you can hear air coming from the defective air spring Air-spring strut/air spring is faulty Replace air-spring strut/air spring → 433019 REMOVING AND INSTALLING FRONT AIR-SPRING STRUT  or carry out repairs → 433037 DISASSEMBLING AND ASSEMBLING FRONT AIR-SPRING STRUT , replace rear air spring → 434319 REMOVING AND INSTALLING REAR AIR SPRING   →  4301IN BLEEDING AND FILLING THE LEVELLING SYSTEM  
    Air line torn off Replace air line → 4301IN BLEEDING AND FILLING THE LEVELLING SYSTEM 
    Symptom Fault detection Possible causes Solution
    Insufficient damping Test drive: Adjust the damping level while the vehicle is in motion. You should feel a significant change in the damping effect when driving on uneven road surfaces. Also check for hard "knocks" (rumbling noises). Damping adjustment valve faulty Replace shock absorber → 433037 DISASSEMBLING AND ASSEMBLING AIR-SPRING STRUT , → 429319 REMOVING AND INSTALLING REAR SHOCK ABSORBER (SPRING DAMPER)
    Vibration damper worn Replace shock absorber → 433037 DISASSEMBLING AND ASSEMBLING AIR-SPRING STRUT , → 429319 REMOVING AND INSTALLING REAR SHOCK ABSORBER (SPRING DAMPER)
    If shock absorbers are worn, clean air line system
    Insufficient cushioning Test drive: Adjust the spring rate while driving using the PASM button. You should notice an obvious change in the spring rate when switching between Comfort and Sport+. Additional volume valve does not switch/faulty Read out the fault memory. Perform drive link test using the Porsche System Tester. A switching noise should be heard coming from near the air spring during the switching process. Replace air-spring strut/air spring → 433019 REMOVING AND INSTALLING FRONT AIR-SPRING STRUT  or carry out repairs → 433037 DISASSEMBLING AND ASSEMBLING FRONT AIR SPRING STRUT , replace rear air spring → 434319 REMOVING AND INSTALLING REAR AIR SPRING 

    Information 

    It may be necessary to adjust the vehicle to the Normal Level in the workshop.

    • Suspension alignment 
    • Ride height measurement 
    • Level check 
    NOTE: Voltage drop
    • Risk of irreparable damage to control unit
    • Risk of damage to control unit
    • Fault entries in the control unit
    • Coding in the control unit is aborted
    • Malfunctions in control unit, even during programming

    → Prior to disconnecting the control unit, switch off ignition and remove ignition key.

    → Ensure that the power supply is not interrupted during programming.

    → Connect a battery charger with a current rating of at least → Nominal value: 40 A  to the vehicle battery.

  2. PIWIS Tester II 9818  must be connected to the vehicle before starting the Tester. Switch on ignition using original remote control (hand-held transmitter).
  3. Check system air flow using PIWIS Tester II 9818  .
    1. 3.1. Select >>PASM << in the control unit overview.
    2. 3.2. Select >>Drive links/checks <<.
    3. 3.3. Execute >>New determination of system air flow <<.
    4. 3.4. If system air flow is OK, continue with → 4. 

      Otherwise, fill the system beforehand → 4301IN BLEEDING AND FILLING THE LEVELLING SYSTEM .

  4. Close vehicle doors/rear lid.
  5. Adjust vehicle to normal level using PIWIS Tester II 9818  .
    1. 5.1. Select >>PASM << in the control unit overview.
    2. 5.2. Select >>Maintenance/repairs <<.
    3. 5.3. Execute >>Height sensor system component test <<.
  6. To avoid level adjustment of the air suspension during alignment, switch off the levelling system and switch it back on again when the work is complete. → 4X00IN LIFTING THE VEHICLE .

    Do not get back into or out of the vehicle again after setting it to normal level for suspension alignment. This can give false alignment results.

  7. Vehicle height measurement 

    Perform the following check under these conditions:

    • The vehicle must be standing on a level surface.
    • The vehicle must be cold and must not be moved during the check.
    • The room temperature should be between 10°C and 30°C and must not fluctuate to any great extent.
    • Measure the vehicle height -dimension 1-  at all four wheels on the vehicle.
      Fig 1: Checking Dimension Between Centre Of Wheel To Lower Edge Of Wing
      G09807739Courtesy of PORSCHE CARS NORTH AMERICA, INC.
    • Measure the vehicle height -dimension 1-  again after two hours and compare it with the first measurement.
    Fig 2: Checking Dimension Between Centre Of Wheel To Lower Edge Of Wing
    G09807740Courtesy of PORSCHE CARS NORTH AMERICA, INC.

    If the vehicle is lying at an angle, there is a leak at the wheel suspension with the greatest difference between the first and second measurement.

    Use commercially available leak detection spray to check the affected air-spring strut/air spring and the relevant air line one after the other.

    If there is no difference after two hours, the vehicle height must be measured again after 24 hours. The difference must not be more than 5 mm after 24 hours.

    The following components must also be checked:

    • Air line connections
    • Air-spring strut/air spring
    • Valve unit

    If the vibration dampers on the front axle are faulty, oil from the vibration damper may have entered the air supply system. To ensure that the air spring system works perfectly, it is absolutely essential that you clean the system after a fault is found and replace other components.

  8. Procedure for repairing the air spring system after a fault is found on the vibration dampers:
    • Screw off the affected line on the air-spring strut/air spring and solenoid valve block.
    • Blow out the line several times until it is clean using compressed air by introducing the compressed air at the end of the line at the solenoid valve block.
    • Check for traces of vibration damper oil in the solenoid valve block.
    • If vibration damper oil has contaminated the valve unit, it must be replaced.
    • Check the internal line from the compressor to the solenoid valve block. If there is oil in the internal line, the compressor must be replaced.
    • If there is oil in the line between the compressor and the pressure accumulator, the line and the pressure accumulator must be replaced.
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