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Home >> Porsche >> 2023 >> Macan T >> Repair and Diagnosis >> External Pages >> Different car >> Section 29 (43 Leveling System, Air Suspension, Damper Control 3.0L -- 95B - MACAN (95B)) >> WM, 430195 Troubleshooting The Levelling System >> Information >> Guided Fault Finding

Guided Fault Finding

WARNING: This page is about a different car, the 2021 Porsche Macan, 2020 Porsche Macan, and 2019 Porsche Macan. However, it is still accessible from the selected car via links, so may be relevant.

Information 

Always read the fault memory out first. Any fault codes must be corrected using Guided Fault Finding in PIWIS Tester  .

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

Fault memory entries 
  • Lift time exceeded
  • Leak in pressure accumulator
 Check vehicle height over a long period of time and find the leak using commercially available leak detection spray Leak in airspring strut/air spring bellows Replace front air-spring strut 
> 433019 - REMOVING AND INSTALLING FRONT AIR-SPRING STRUT 
or repair it
REFERENCE is missing 
Replace rear air suspension bellows 
> 434319 - REMOVING AND INSTALLING AIR SUSPENSION BELLOWS 
> 430117 - 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 (colour 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 Level sensor faulty Replace level sensor 
> 431855 - REPLACING FRONT LEVEL SENSOR 
> 431955 - REPLACING REAR LEVEL SENSOR 
    Linkage or level sensor holder bent  
    Sensor for body not installed/screwed correctly Visual inspection of all sensors for body 
> 433419 - REMOVING AND INSTALLING SENSOR FOR BODY 
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 Visual inspection for 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 clean frozen and blocked air lines using compressed air
  3.) Valve unit blocked Dirt in valve unit Replace valve unit 
> 432355 - REPLACING VALVE UNIT 
  4.) Compressor/valve block blocked Dirt in compressor/valve block Replace compressor 
> 431519 - REMOVING AND INSTALLING COMPRESSOR 
  5.) Carry out Guided Fault Finding using the Porsche System Tester
  • Check relays, plug contacts, wiring harness and fuses in the vehicle electrical system
  • Drain valve in compressor faulty/leaking/open
  
   
  • Drain valve in compressor or control valves in valve block do not work
  • Valve unit does not work
  
  6.) If no faults were found after carrying out Step 5.), the compressor is faulty Compressor faulty  
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 Visual inspection for damage and check clearance around the airspring 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 
  4.) Compressor/valve block blocked Dirt in compressor/valve block Replace compressor 
> 431519 - REMOVING AND INSTALLING COMPRESSOR 
  5.) Carry out Guided Fault Finding using the Porsche System Tester
  • Check relays, plug contacts, wiring harness and fuses in the vehicle electrical system
  • Drain valve in compressor faulty/leaking/open
  
   
  • Drain valve in compressor or control valves in valve block do not work
  
  6.) If no faults were found after carrying out Step 5.), the compressor is faulty Compressor faulty  
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 faulty air spring Air-spring strut/air suspension bellows faulty Replace front air-spring strut 
> 433019 - REMOVING AND INSTALLING FRONT AIRSPRING STRUT 
or repair it
REFERENCE is missing Replace rear air suspension bellows 
> 434319 - REMOVING AND INSTALLING AIR SUSPENSION BELLOWS 
> 430117 - BLEEDING AND FILLING THE LEVELLING SYSTEM 
    Air line torn off Repair air line
> 430117 - BLEEDING AND FILLING THE LEVELLING SYSTEM 
Symptom Fault detection Possible causes Solution
Insufficient damping  Test drive: Adjust the damping level while driving. You should feel a significant change in the damping effect when driving on uneven road surfaces. Also check for hard "knocks" (rumbling noises). Electric connector for PASM faulty Check electric connector for PASM and replace it if necessary
    Damping adjustment valve faulty Replace front airspring strut REFERENCE is missing Replace shock absorbers 
> 429319 - REMOVING AND INSTALLING REAR SHOCK ABSORBER
If shock absorbers are worn, clean the air line system 
    Shock absorbers worn  
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