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Home >> Porsche >> 2012 >> Cayenne S >> Repair and Diagnosis >> Suspension >> Electronic Suspension >> 43 - Leveling System, Air Suspension, Damper Control (4.8L Non Turbo) -- 92A - Cayenne (92A) >> WM, 430149 Troubleshooting The Levelling System >> Information >> Troubleshooting

WM, 430149 Troubleshooting The Levelling System: Information: Troubleshooting

Component arrangement - air suspension

> WM, 4300IN 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
    > WM, 433019 REMOVING AND INSTALLING FRONT SPRING STRUT (AIR SPRINGS) 
    > Refer to the appropriate service information
    or carry out repairs
    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 
    Linkage or holder for vehicle level sensor is bent >431955 REPLACING REAR LEVEL SENSOR 
    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
    > Refer to the appropriate service information
    4.) Compressor/valve block blocked Dirt in compressor/valve block Replace compressor
    > Refer to the appropriate service information
    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
    > Refer to the appropriate service information
    Drain valve in compressor or control valves in valve block do not work
    Valve unit does not work    		 Replace compressor
    > Refer to the appropriate service information
    6.) Levelling system: Upper/lower limit value exceeded Compressor fuse faulty Replace compressor
    > 431519 REMOVING AND INSTALLING COMPRESSOR FOR THE LEVELLING SYSTEM 
    7.) If no faults were found after carrying out Step 6.), the compressor is faulty Compressor faulty Replace compressor
    > Refer to the appropriate service information
    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
    > Refer to the appropriate service information
    4.) Compressor/valve block blocked Dirt in compressor/valve block Replace compressor
    > Refer to the appropriate service information
    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
    > Refer to the appropriate service information
    Drain valve in compressor or control valves in valve block do not work Replace compressor
    > Refer to the appropriate service information
    6.) If no faults were found after carrying out Step 5.), the compressor is faulty Compressor faulty Replace compressor
    > Refer to the appropriate service information
    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 faulty air spring Air-spring strut/air spring is faulty Replace air-spring strut/air spring
    > WM, 433019 REMOVING AND INSTALLING FRONT SPRING STRUT (AIR SPRINGS) 
    > Refer to the appropriate service information
    or carry out repairs
    >4301IN BLEEDING AND FILLING THE LEVELLING SYSTEM 
    Air line torn off Replace air line
    >4301IN BLEEDING AND FILLING THE LEVELLING SYSTEM 
    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 listen for "rumbling noises" Damping adjustment valve faulty Replace air-spring strut/air spring
    > WM, 433019 REMOVING AND INSTALLING FRONT SPRING STRUT (AIR SPRINGS) 
    > Refer to the appropriate service information
    or repair air-spring strut
    Vibration damper worn Replace air-spring strut/air spring
    > WM, 433019 REMOVING AND INSTALLING FRONT SPRING STRUT (AIR SPRINGS) 
    > Refer to the appropriate service information
    or carry out repairs; clean air line system
    See  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 the area of the air spring during the gear change. Replace air-spring strut/air spring
    > WM, 433019 REMOVING AND INSTALLING FRONT SPRING STRUT (AIR SPRINGS) 
    > Refer to the appropriate service information
  2. 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.
    • Connect Porsche System Tester.
    • Stop the vehicle and apply the brake.
    • Close vehicle doors.
    • Adjust the vehicle to terrain level. To do this, tap the rocker switch on the center console in the appropriate direction until the vehicle is set to terrain level.
    • Open the door.
    • Select normal level.
    • Get out and close the door. The vehicle switches to normal level.
    • Do not get back into or out of the vehicle again after setting it to normal level. This can give false alignment results.
    • Deactivate the levelling system using the Porsche System Tester.
    • Measure the vehicle height -dimension X-  at all four wheels on the vehicle. > Dimension X = center of wheel to lower edge of wing (rear axle shown) 
      G16329563Courtesy of PORSCHE CARS NORTH AMERICA, INC.

      Dimension X = center of wheel to lower edge of wing (rear axle shown)

    • Measure the vehicle height -dimension X-  again > Dimension X = center of wheel to lower edge of wing (rear axle shown)  after two hours and compare it with the first measurement.
    • Dimensions and tolerances can taken from the prescribed vehicle height for vehicles with air suspension.

      > 4495TW ADJUSTMENT VALUES FOR SUSPENSION ALIGNMENT

    G16329564Courtesy of PORSCHE CARS NORTH AMERICA, INC.

    Dimension X = center of wheel to lower edge of wing (rear axle shown)

    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 following components must also be checked:

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

    If the vibration dampers 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.

  3. 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 line between the compressor and the pressure accumulator, the line and the pressure accumulator must be replaced.

    If there is oil in the internal line, the compressor must be replaced.

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