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

Guided Fault Finding

Component arrangement - air suspension

> Refer to the appropriate service information

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 the leak using 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) 
> 432519 REMOVING AND INSTALLING REAR SPRING STRUT (AIR SPRINGS) 
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
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> WM, 431855 REPLACING FRONT LEVEL SENSOR 
> 431955 REPLACING REAR LEVEL SENSOR 
Linkage or holder for vehicle level sensor is bent
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
Air line on front axle not inserted far enough (fault code 284)		 Replace kinked air lines; carefully blow out frozen and blocked air lines using compressed air
Insert air line on front axle as far as it will go; only one marking should be visible.
3.) Levelling system: Upper/lower limit value exceeded Compressor fuse faulty
Air line on front axle not inserted far enough (fault code 284)		 Replace compressor> WM, 431519 REMOVING AND INSTALLING COMPRESSOR FOR LEVELLING SYSTEM 
Insert air line on front axle as far as it will go; only one marking should be visible.
4.) 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> WM, 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> WM, 431519 REMOVING AND INSTALLING COMPRESSOR FOR LEVELLING SYSTEM 
5.) Valve unit blocked Dirt in valve unit Replace valve unit> WM, 430419 REMOVING AND INSTALLING VALVE BLOCK 
6.) Compressor/valve block blocked Dirt in compressor/valve block Replace compressor> WM, 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> WM, 431519 REMOVING AND INSTALLING COMPRESSOR FOR LEVELLING SYSTEM 
Vehicle is too low
  • Vehicle cannot be raised or can only be raised very slowly
 1.) 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
2.) Valve unit blocked Dirt in valve unit Replace valve unit> WM, 430419 REMOVING AND INSTALLING VALVE BLOCK 
3.) Compressor/valve block blocked Dirt in compressor/valve block Replace compressor> WM, 431519 REMOVING AND INSTALLING COMPRESSOR FOR LEVELLING SYSTEM 
4.) 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> WM, 431519 REMOVING AND INSTALLING COMPRESSOR FOR LEVELLING SYSTEM 
Drain valve in compressor or control valves in valve block do not work Replace compressor> WM, 431519 REMOVING AND INSTALLING COMPRESSOR FOR LEVELLING SYSTEM 
5.) If no faults were found after carrying out Step 4.), the compressor is faulty Compressor faulty Replace compressor> WM, 431519 REMOVING AND INSTALLING COMPRESSOR FOR LEVELLING SYSTEM 
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) 
> 432519 REMOVING AND INSTALLING REAR SPRING STRUT (AIR SPRINGS) 
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> WM, 433019 REMOVING AND INSTALLING FRONT SPRING STRUT (AIR SPRINGS) 
or replace rear shock absorber> WM, 432537 DISASSEMBLING AND ASSEMBLING REAR SPRING STRUT (AIR SPRINGS) 
Vibration damper worn Replace air-spring strut> WM, 433019 REMOVING AND INSTALLING FRONT SPRING STRUT (AIR SPRINGS) 
; clean air line system or replace rear shock absorber> WM, 432537 DISASSEMBLING AND ASSEMBLING REAR SPRING STRUT (AIR SPRINGS) 
Error message "PASM failure" with significant inward/outward spring motion. The error message is gone after switching the ignition off and on again. Fault code 322, 323, 324 or 325 stored in the fault memory. Front level sensor holder bent. Replace front level sensor> WM, 431855 REPLACING FRONT LEVEL SENSOR 
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