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Level Control - Diagnostics: Other Porsche Cayenne I

Electronic Suspension 9 illustrations ~4245 words

Level control with PASM (Porsche Active Suspension Management)

Level control with PASM diagnosis software number: from 0201

Cayenne as of model year 2003

General instructions/safety instructions

The following points must be observed during vehicle diagnosis

  1. After the battery is connected, volatile memories must be reprogrammed. In the case of radio coding and tuning, the customer must be informed of decoding and the deleted tuner memory. Carry out work instruction after disconnecting the battery. Refer to «90 IN Work instructions after disconnecting the battery - as of MY 2003 (All Models Except Cayenne S TIO Titan)»(ref-274623-S36378860462007121900000) must be observed.
  2. After troubleshooting or repairs, erase the fault memory with the 9588 Porsche System Tester II and carry out a test drive.
  3. After the test drive, read out the fault memory again with the 9588 Porsche System Tester II.
WARNINGDanger of injury through triggering of driver's airbag 9588 Never hang the Porsche System Tester II over the steering wheel.
WARNINGDanger of injury and damage due to unusual vehicle handling when plugs or components are disconnected! Never disconnect plugs when the vehicle is in motion or drive the vehicle with plugs disconnected. Drive only with all parts fully installed and connected.
WARNINGDanger of personal injury from lowering vehicle independently when working on and underneath the vehicle! The normal level must always be set and the level control switched off when the vehicle is raised with the jack or platform lift.
WARNINGDanger of personal injury from moving vehicle independently with gear engaged and engine running! Before starting the engine in a vehicle with manual transmission, take the vehicle out of gear and put the hand brake on firmly. Before starting the engine in a vehicle with automatic transmission, move the selector lever to position V and put the hand brake on firmly.
CAUTIONDanger of injury and material damage if the wheel carrier is raised incorrectly! Do not raise the wheel suspension higher than the normal vehicle position (vehicle resting on wheels)! When raising, use a suitable intermediate layer (hard rubber)! Do not damage the brake cover plate!
CAUTIONThe vehicle rises when the air springs are filled!
CAUTIONDanger of damage due to improper handling of batteries and control module plug connections! Never disconnect battery with engine running. Never start engine if battery terminal clamps are not connected securely. Never pull off or push on plug connections for the control modules or other electronic components when the ignition is switched on. Always disconnect the negative terminal of the battery and pull off all plug connections to the vehicle electrical system control module when carrying out welding work on the vehicle.

Note. If a relay fault or multiple valve faults are recorded, check the system's plug connections for correct contacts.

Fault code setting conditions

Fault codes can be set in several circumstances, e.g.

  1. battery disconnected
  2. plug connections disconnected
  3. faulty coding
  4. power failure
  5. etc.

In these circumstances, no fault is present in the system and the fault memory must be erased.

Possible causes of fault

Note. The 'possible causes of fault' that are responsible for the fault are listed here. Please note that in certain circumstances further faults can be stored in the fault memory after troubleshooting (e.g. if plugs are disconnected). After carrying out repairs, read out the fault memory of all control modules and erase any faults.

Fault type

The following fault types are possible

  1. no display
  2. upper limit value exceeded
  3. lower limit value not reached
  4. mechanical fault
  5. no signal/communication
  6. no or incorrect basic setting/adaptation
  7. short circuit to B+
  8. short circuit to ground
  9. implausible signal
  10. open circuit/short circuit to ground
  11. open circuit/short circuit to B+
  12. open circuit
  13. electrical fault in electric circuit
  14. please read out fault memory
  15. faulty
  16. cannot be checked now

Fault status

The following status types are possible

  1. present
  2. not present

This information should be saved using the Save key [F4] and printed out.

Note. Visual inspection: During troubleshooting, please check first that the affected pins on the level control module plug connection are neither damaged nor corroded. The wiring and plugs of the affected components must also be checked for external damage and correct contacts. Repair damaged or corroded pins if possible, otherwise replace affected pins. Repair or replace damaged wires.

Note. Battery voltage and signals: A battery voltage of between 11.4 and 14.5 V is required for troubleshooting. This must be checked and provided if necessary. Both signals and voltages as well as components or fuses (input side) must be guaranteed on the vehicle electrical system.

Note. Specified resistance values are based on an ambient temperature of 20°C.

Tools

WARNINGDanger of personal injury while working with special tools 9588 Never hang the Porsche System Tester II over the steering wheel

Note. Plug contacts are optimally designed to suit the plug system. Operations on pins can cause contact problems. Always use suitable measurement tools for adapter plugs and test cables.

Scheme 86

Scheme 86: Battery charging device
Scheme 86: Battery charging device

Scheme 87

Scheme 87: 9588 Porsche System Tester II
Scheme 87: 9588 Porsche System Tester II

Scheme 88

Scheme 88: Commercially available digital multimeter
Scheme 88: Commercially available digital multimeter

Scheme 89

Scheme 89: 9684 Measurement tool set
Scheme 89: 9684 Measurement tool set

Scheme 90

Scheme 90: Component arrangement
Scheme 90: Component arrangement
  1. CAN drive
  1. Suction line for compressor
  2. Air-spring strut, front axle, right
  3. Body acceleration sensor, front right 2x front and 1x rear
  4. Vehicle level sensor, front right At the top of the control arm
  5. Wheel acceleration sensor, front right 1x on each air-spring strut on the front axle
  6. Pressure pipes
  7. Air-spring strut, front axle, left
  8. Wheel acceleration sensor, front left 1x on each air-spring strut on the front axle
  9. Vehicle level sensor, front left At the top of the control arm
  10. Body acceleration sensor, front left 2x front and 1x rear
  11. Compressor
  12. Valve block
  13. Instrument cluster
  14. Compressed air connection Installed below seat frame, front right
  15. Selector switch (level control module)
  16. Accumulator, front
  17. Vehicle level sensor, rear right At the top of the control arm
  18. Air-spring strut, rear axle, right
  19. Body acceleration sensor, rear right 2x front and 1x rear
  20. Level control module Both control module types (with/without PASM) installed in the same location
  21. Vehicle level sensor, rear left At the top of the control arm
  22. Air-spring strut, rear axle, left
  23. Accumulator, rear

Scheme 91

Scheme 91: Level control module
Scheme 91: Level control module

Control unit faulty

Note. Only if the fault code 0003 'Control unit faulty' appears in the Porsche System Tester II No. 9588 in conjunction with the red warning in the instrument cluster 'Air spring warning', can a fault in the control unit be assumed. If no red warning is present in the instrument cluster or if the logo 'Air spring warning' is not displayed, then the fault can be erased without troubleshooting.

Possible cause of fault

  1. Incorrect interpretation in control unit software
  2. Control unit (level control) faulty
  1. Open circuit in the wiring of pin 86 of the level control module
  2. Short circuit to ground in the wiring in pin 86 of the level control module
  3. Level control module receives implausible signal from wheel acceleration sensor
  4. Wheel acceleration sensor faulty
  5. Level control module faulty

Affected pins

Level control module, plug B

  1. Pin 86

Wheel acceleration sensor, front left, plug B

  1. Pin 2
  1. Open circuit in wire from control unit (level control) pin 87
  2. Short circuit to ground in wire from control unit (level control) pin 87
  3. Level control module receives implausible signal from wheel acceleration sensor
  4. Wheel acceleration sensor faulty
  5. Level control module faulty

Level control module, plug B

  1. Pin 87

Wheel acceleration sensor, front right, plug B

  1. Pin 2
  1. Open circuit in the wiring in pin 94 of the level control module
  2. Short circuit to ground in the wiring in pin 94 of the level control module
  3. Level control module receives implausible signal from body acceleration sensor
  4. Body acceleration sensor faulty
  5. Level control module faulty

Level control module, plug B

  1. Pin 94

Body acceleration sensor, front left

  1. Pin 2
  1. Open circuit in the wiring of pin 95 of the level control module
  2. Short circuit to ground in the wiring of pin 95 of the level control module
  3. Level control module receives implausible signal from body acceleration sensor
  4. Body acceleration sensor faulty
  5. Level control module faulty

Level control module, plug B

  1. Pin 95

Body acceleration sensor, front right

  1. Pin 2
  1. Open circuit in the wiring of pin 96 of the level control module
  2. Short circuit to ground in the wiring of pin 96 of the level control module
  3. Level control module receives implausible signal from body acceleration sensor
  4. Body acceleration sensor faulty
  5. Level control module faulty

Level control module, plug B

  1. Pin 96

Rear body acceleration sensor

  1. Pin 2
  1. Short circuit to ground or open circuit in the wiring of pin 115 of the level control module (electrical fault in electric circuit)
  2. Short circuit in pins 115 and 117 of the level control module wiring with respect to each other (electrical fault in electric circuit)
  3. Short circuit to B+ in the wiring of pin 115 of the level control module (electrical fault in electric circuit)
  4. Short circuit to B+ or open circuit in the wiring of pin 117 of the level control module (electrical fault in electric circuit)
  5. Short circuit to B+ in the wiring of pin 117 of the level control module (electrical fault in electric circuit)
  6. Damping adjustment valve faulty
  7. Level control module faulty

Level control module, plug B

  1. Pin 115
  2. Pin 117

Front left damping adjustment valve, plug A

  1. Pin 1
  2. Pin 2
  1. Short circuit to ground or open circuit in the wiring of pin 116 of the level control module (electrical fault in electric circuit)
  2. Short circuit in pins 116 and 118 of the level control module wires with respect to each other (electrical fault in electric circuit)
  3. Short circuit to B+ in the wiring of pin 116 of the level control module (electrical fault in electric circuit)
  4. Short circuit to B+ or open circuit in the wiring of pin 118 of the level control module (electrical fault in electric circuit)
  5. Short circuit to ground in the wiring of pin 118 of the level control module (electrical fault in electric circuit)
  6. Damping adjustment valve faulty
  7. Level control module faulty

Level control module, plug B

  1. Pin 116
  2. Pin 118

Front right damping adjustment valve, plug A

  1. Pin 1
  2. Pin 2
  1. Short circuit to ground or open circuit in the wiring of pin 119 of the level control module (electrical fault in electric circuit)
  2. Short circuit in pins 114 and 119 of the level control module wiring with respect to each other (electrical fault in electric circuit)
  3. Short circuit to B+ in the wiring of pin 119 of the level control module (electrical fault in electric circuit)
  4. Short circuit to B+ or open circuit in the wiring of pin 114 of the level control module (electrical fault in electric circuit)
  5. Short circuit to ground in the wiring of pin 114 of the level control module (electrical fault in electric circuit)
  6. Damping adjustment valve faulty
  7. Level control module faulty

Level control module, plug B

  1. Pin 114
  2. Pin 119

Rear left damping adjustment valve, plug A

  1. Pin 1
  2. Pin 2
  1. Short circuit to ground or open circuit in the wiring of pin 121 of the level control module (electrical fault in electric circuit)
  2. Short circuit in pins 120 and 121 of the level control module wiring with respect to each other (electrical fault in electric circuit)
  3. Short circuit to B+ in the wiring of pin 121 of the level control module (electrical fault in electric circuit)
  4. Short circuit to B+ or open circuit in the wiring of pin 120 of the level control module (electrical fault in electric circuit)
  5. Short circuit to ground in the wiring of pin 120 of the level control module (electrical fault in electric circuit)
  6. Damping adjustment valve faulty
  7. Level control module faulty

Level control module, plug B

  1. Pin 120
  2. Pin 121

Rear right damping adjustment valve, plug A

  1. Pin 1
  2. Pin 2
  1. Short circuit to B+ in one or more wires in the level control module
  2. Short circuit to ground in one or more wires in the level control module
  3. Front right body acceleration sensor faulty
  4. Front right wheel acceleration sensor faulty
  5. Rear left body acceleration sensor faulty
  6. Level control module faulty

Level control module, plug B

  1. Pin 87 'signal for FR wheel acceleration sensor'
  2. Pin 95 'signal for FR body acceleration sensor'
  3. Pin 96 'signal for RL body acceleration sensor'
  4. Pin 99 'ground for FR wheel acceleration sensor'
  5. Pin 103 'ground for FR body acceleration sensor'
  6. Pin 104 'ground for RL body acceleration sensor'
  7. Pin 106 'supply for FR wheel acceleration sensor'
  8. Pin 107 'supply for FR body acceleration sensor'
  9. Pin 109 'supply for RL body acceleration sensor'
  1. Short circuit to B+ in one or more wires in the level control module
  2. Short circuit to ground in one or more wires in the level control module
  3. Front left body acceleration sensor faulty
  4. Front left wheel acceleration sensor faulty
  5. Level control module faulty

Level control module, plug B

  1. Pin 86 'signal for FL wheel acceleration sensor'
  2. Pin 94 'signal for FL body acceleration sensor'
  3. Pin 98 'ground for FL wheel acceleration sensor'
  4. Pin 102 'ground for FL body acceleration sensor'
  5. Pin 110 'supply for FL wheel acceleration sensor'
  6. Pin 111 'supply for FL body acceleration sensor'
  1. No end of production programming performed (or it was started but not finished)
  2. No or incorrect basic setting/adaptation
  3. Level control module faulty
  1. Short circuit to ground in pin 54 and/or pin 55 of the level control module wiring (implausible signal)
  2. Open circuit in pin 54 and/or pin 55 and/or pin 100 of the level control module wiring
  3. Level control module faulty

Level control module, plug A

  1. Pin 54
  2. Pin 55
  3. Level control module, plug B
  4. Pin 100
  1. Internal fault in the level adjustment control unit
  1. Short circuit to ground or open circuit in pin 4 and/or pin 5 of the level control module wiring
  2. Fuse F27 (15A) in fuse carrier at right of dashboard faulty
  3. Level control module faulty

Level control module, plug A

  1. Pin 4
  2. Pin 5

Fuse in fuse carrier at right of dashboard: 'F27' (15A)

  1. Short circuit to B+ in the wiring of pin 90 of the level control module (electrical fault in electric circuit)
  2. Short circuit to ground in the wiring of pin 90 of the level control module (electrical fault in electric circuit)
  3. Open circuit in one or more wires connected to pins 90, 75 and 64 of the level control module (electrical fault in electric circuit)
  4. Level control module receives implausible signal from vehicle level sensor
  5. If implausible signal is received from vehicle level sensor, perform calibration, refer to «43 K2 CALIBRATION - AS OF MY 2003 (ALL MODELS EXCEPT CAYENNE S TIO TITAN)»(ref-274645-S37689639902007121900000) .
  6. Vehicle level sensor faulty
  7. Level control module faulty

Level control module, plug A

  1. Pin 64
  2. Pin 75

Level control module, plug B

  1. Pin 90

Rear left vehicle level sensor, plug A

  1. Pin 1
  2. Pin 5
  3. Pin 6
WARNINGDanger of personal injury from lowering vehicle independently when working on and underneath the vehicle! The normal level must always be set and the level control switched off when the vehicle is raised with the jack or platform lift.
  1. Short circuit to B+ in the wiring of pin 91 of the level control module (electrical fault in electric circuit)
  2. Short circuit to ground in the wiring of pin 91 of the level control module (electrical fault in electric circuit)
  3. Open circuit in one or more wires connected to pins 91, 74 and 66 of the level control module (electrical fault in electric circuit)
  4. Level control module receives implausible signal from vehicle level sensor
  5. If implausible signal is received from vehicle level sensor, perform calibration, refer to «43 K2 CALIBRATION - AS OF MY 2003 (ALL MODELS EXCEPT CAYENNE S TIO TITAN)»(ref-274645-S37689639902007121900000) .
  6. Vehicle level sensor faulty
  7. Level control module faulty

Level control module, plug A

  1. Pin 66
  2. Pin 74

Level control module, plug B

  1. Pin 91

Rear right vehicle level sensor, plug A

  1. Pin 1
  2. Pin 5
  3. Pin 6
WARNINGDanger of personal injury from lowering vehicle independently when working on and underneath the vehicle! The normal level must always be set and the level control switched off when the vehicle is raised with the jack or platform lift.
  1. Short circuit to B+ in the wiring of pin 82 of the level control module (electrical fault in electric circuit)
  2. Short circuit to ground in the wiring of pin 82 of the level control module (electrical fault in electric circuit)
  3. Open circuit in one or more wires connected to pins 63, 77 and 82 of the level control module (electrical fault in electric circuit)
  4. Level control module receives implausible signal from vehicle level sensor
  5. If implausible signal is received from vehicle level sensor, perform calibration, refer to «43 K2 CALIBRATION - AS OF MY 2003 (ALL MODELS EXCEPT CAYENNE S TIO TITAN)»(ref-274645-S37689639902007121900000) .
  6. Vehicle level sensor faulty
  7. Level control module faulty

Level control module, plug A

  1. Pin 63
  2. Pin 77

Level control module, plug B

  1. Pin 82

Front left vehicle level sensor, plug A

  1. Pin 1
  2. Pin 5
  3. Pin 6
WARNINGDanger of personal injury from lowering vehicle independently when working on and underneath the vehicle! The normal level must always be set and the level control switched off when the vehicle is raised with the jack or platform lift.

Steering-angle sensor

CAUTIONThe steering-angle sensor must always be initialized 'control lamp on' whenever the battery terminal is disconnected.
  1. Initialization/calibration not performed (no display/no or incorrect basic setting/adaptation)
  2. Mechanical fault
  3. The signal received from the control module (level control) via the CAN drive does not correspond to the expected signal (implausible signal)
  4. CAN drive faulty (no signal/communication)
  5. Steering-angle sensor faulty

Level control module, plug A

  1. Pin 61 'CAN drive (high)'
  2. Pin 81 'CAN drive (low)'

Initializing

The steering-angle sensor in Cayenne must be initialized after the following work is carried out

  1. Whenever the power supply is interrupted (NRA control lamp on).
  2. The steering-angle sensor must be calibrated after all work on the running gear.

Note. Calibration of the steering-angle sensor must be performed on a measuring platform. First, the level control module must be coded successfully and the steering-angle sensor must be initialized. The steering-angle sensor must be calibrated after work has been carried out on the running gear in the area of the front axle.

Work instructionDisplay OKIf not OK
1Initialize steering-angle sensorSwitch on ignition. Position wheels straight ahead. From the straight-ahead position, turn the steering wheel approx. '15°' to the left and '15°' to the right (past the straight-ahead position). Drive the vehicle straight ahead at a speed of '> 4 km/h for at least 1 second'.After successful initialization, the stored fault code is erased from the fault memory and the NRA control lamp goes out. --> EndGo to Step 2
2Check steering-angle sensor calibration using 9588 Porsche System Tester IIRunning gear set according to Porsche specifications. Wheels in straight-ahead position and steering wheel horizontal. Steering wheel may be turned by max. '± 2.0°' from the horizontal position for driving straight ahead.After successful calibration, the stored fault code is erased from the fault memory. --> EndGo to Step 3
3Mechanical faultExamine moving parts for damage and check mobility.Go to Step 4The steering-angle sensor is integrated into the steering column switch and must be replaced along with this if its functionality is mechanically impaired. --> End
4Read out steering column switch control module, fault memory and check circuit for short or open circuitEliminate faults in accordance with 'Diagnosis/troubleshooting' for steering column switch control module.If electric circuit is OK: Go to Step 5Repair wiring harness circuit. --> End
5Check CAN driveLocalize faults in accordance with CHECKING INSTRUCTIONS/CAN DATA BUS .If CAN drive is OK: Go to Step 6Repair wiring harness. --> End
6Replace steering-angle sensorThe steering-angle sensor can only be replaced together with the steering column switch. --> EndGo to Step 7
7Replace level control module> End

DIAGNOSIS/TROUBLESHOOTING PROCEDURE

  1. Short circuit to B+ in the wiring of pin 18 of the level control module
  2. Short circuit to ground in the wiring of pin 18 of the level control module
  3. Open circuit in the wiring of pin 18 of the level control module
  4. Spring strut valve faulty
  5. Level control module faulty

Note. If multiple valve faults (fault code 0806, 0807, 0808) or another relay fault (fault code 1399) are recorded, check the system's plug connections for correct contacts.

Level control module, plug A

  1. Pin 18

Solenoid block, plug A

  1. Pin 4
  1. Short circuit to B+ in the wiring of pin 19 of the level control module
  2. Short circuit to ground in the wiring of pin 19 of the level control module
  3. Open circuit in the wiring of pin 19 of the level control module
  4. Spring strut valve faulty
  5. Level control module faulty

Note. If multiple valve faults (fault code 0805, 0807, 0808) or another relay fault (fault code 1399) are recorded, check the system's plug connections for correct contacts.

Level control module, plug A

  1. Pin 19
  2. Solenoid block, plug A
  3. Pin 2
  1. Short circuit to B+ in the wiring of pin 20 of the level control module
  2. Short circuit to ground in the wiring of pin 20 of the level control module
  3. Open circuit in the wiring of pin 20 of the level control module
  4. Spring strut valve faulty
  5. Level control module faulty

Note. If multiple valve faults (fault code 0805, 0806, 0808) or another relay fault (fault code 1399) are recorded, check the system's plug connections for correct contacts.

Level control module, plug A

  1. Pin 20

Solenoid block, plug A

  1. Pin 1
  1. Short circuit to B+ in the wiring of pin 17 of the level control module
  2. Short circuit to ground in the wiring of pin 17 of the level control module
  3. Open circuit in the wiring of pin 17 of the level control module
  4. Spring strut valve faulty
  5. Level control module faulty

Note. If multiple valve faults (fault code 0805, 0806, 0807) or another relay fault (fault code 1399) are recorded, check the system's plug connections for correct contacts.

Level control module, plug A

  1. Pin 17

Solenoid block, plug A

  1. Pin 3
  1. Level control module not coded (no display)
  1. CAN drive faulty
  2. Please read out fault memory

Level control module, plug A

  1. Pin 61 'CAN drive (high)'
  2. Pin 81 'CAN drive (low)'
  1. Level control module could not establish a connection with the DME control module (no signal/communication)
  2. Read out DME control module fault memory

Level control module, plug A

  1. Pin 61 'CAN drive (high)'
  2. Pin 81 'CAN drive (low)'
  1. Level control module could not establish a connection with the PSM control module (no signal/communication)
  2. Read out PSM control module fault memory

Level control module, plug A

  1. Pin 61 'CAN drive (high)'
  2. Pin 81 'CAN drive (low)'
  1. Short circuit to B+ in the wiring of pin 33 of the level control module (identified only when activated)
  2. Short circuit to ground or open circuit in the wiring of pin 33 of the level control module
  3. Vent solenoid valve faulty
  4. Level control module faulty

Note. If multiple valve faults (fault code 0805, 0806, 0807, 0808) or another relay fault (fault code 1399) are recorded, check the system's plug connections for correct contacts.

Level control module, plug A

  1. Pin 33 'vent solenoid valve (low)'
  2. Pin 43 'vent solenoid valve (high)'

Level control system compressor, plug A

  1. Pin 1 'vent solenoid valve (high)'
  2. Pin 2 'vent solenoid valve (low)'
  1. Level control module receives no signal from vehicle electrical system control module
  2. Short circuit to B+ in the wiring of pin 53 of the level control module
  3. Short circuit to ground in the wiring of pin 53 of the level control module
  4. Open circuit in the wiring of pin 53 of the level control module
  5. Level control module faulty

Level control module, plug A

  1. Pin 53

Vehicle electrical system control module, plug J

  1. Pin 12
  1. Short circuit to B+ in the wiring of pin 31 of the level control module
  2. Short circuit to ground or open circuit in the wiring of pin 31 of the level control module
  3. Compressor relay faulty
  4. Level control module faulty

Note. If multiple valve faults (fault code 0805, 0806, 0807, 0808) are recorded, check the system's plug connections for correct contacts.

Level control module, plug A

  1. Pin 31 'compressor relay'
  2. Pin 36 'compressor relay (high)'

Compressor relay, plug A

  1. Pin 3F (terminal 85)
  2. Pin 3D (terminal 86)
  1. Control position not adjustable, vehicle too low or too high (no display)
  1. Control position not learned (no or incorrect basic calibration)
  1. Level adjustment control unit faulty (implausible signal)
  2. Level adjustment control unit not calibrated or calibrated incorrectly (implausible signal)
  3. Level adjustment control unit faulty
  1. Level control selector switch actuated for longer than 5 seconds
  2. Vehicle is not travelling at more than 15 km/h (9 mph)
  3. Level control module faulty
  1. The compressor switches off as a result of overtemperature (upper limit is exceeded)
  2. Compressor temperature sensor faulty
  3. Level control module faulty

Level control module, plug B

  1. Pin 85 'temperature sensor'
  2. Pin 93 'temperature sensor ground'

Level control system compressor, plug A

  1. Pin 3 'temperature sensor'
  2. Pin 4 'temperature sensor ground'

Scheme 92

Scheme 92: Compressor temperature
Scheme 92: Compressor temperature
Work instructionDisplay OKIf not OK
1Check compressor temperature sensorSwitch off ignition. Pull plug B off level control module. Measure resistance on level control module plug B between 'pins 85 and 93'.12.2 - 13.72 ohms at 20°C or see ' COMPRESSOR TEMPERATURE ' diagram Go to Step 2Replace level control system compressor. --> End
2Check wiring between level control system compressor and level control module for short circuit to groundSwitch off ignition. Measure resistance between level control module plug B 'pins 85, 93' and ground.Infinity ohms Go to Step 3Repair or replace wiring harness. --> End
3Check wiring between level control system compressor and level control module for short circuit with respect to each otherMeasure resistance on level control module plug B between 'pin 85' and 'pin 93'.Infinity ohms Go to Step 4Repair or replace wiring harness. --> End
4Replace level control module> End

DIAGNOSIS/TROUBLESHOOTING PROCEDURE

  1. Vehicle battery is or has been subjected to overvoltage (upper limit value is exceeded)
  2. Vehicle battery is or has been subjected to undervoltage (lower limit value is not reached)
  3. Fuse 'F27' (15A) in fuse carrier at right of dashboard faulty

Level control module, plug A

  1. Pin 4
  2. Pin 5

Fuse in fuse carrier at right of dashboard: 'F27' (15A)

  1. Short circuit to B+ in the wiring of pin 63 and/or pin 64 of the level control module
  2. Short circuit to ground in the wiring of pin 63 and/or pin 64 of the level control module
  3. Vehicle level sensors need to be calibrated, refer to «43 K2 CALIBRATION - AS OF MY 2003 (ALL MODELS EXCEPT CAYENNE S TIO TITAN)»(ref-274645-S37689639902007121900000) .
  4. Level control module faulty

Level control module, plug A

  1. Pin 63 'FL vehicle level sensor'
  2. Pin 64 'RL vehicle level sensor'

Front left vehicle level sensor, plug A

  1. Pin 5

Rear left vehicle level sensor, plug A

  1. Pin 5
  1. Short circuit to B+ in the wiring of pin 65 and/or pin 66 of the level control module
  2. Short circuit to ground in the wiring of pin 65 and/or pin 66 of the level control module
  3. Vehicle level sensors need to be calibrated, refer to «43 K2 CALIBRATION - AS OF MY 2003 (ALL MODELS EXCEPT CAYENNE S TIO TITAN)»(ref-274645-S37689639902007121900000) .
  4. Level control module faulty

Level control module, plug A

  1. Pin 65 'FR vehicle level sensor'
  2. Pin 66 'RR vehicle level sensor'

Front right vehicle level sensor, plug A

  1. Pin 5

Rear right vehicle level sensor, plug A

  1. Pin 5
  1. Short circuit to B+ in the wiring of pin 83 of the level control module (electrical fault in electric circuit)
  2. Short circuit to ground in the wiring of pin 83 of the level control module (electrical fault in electric circuit)
  3. Open circuit in one or more wires connected to pins 65, 76 and 83 of the level control module (electrical fault in electric circuit)
  4. Level control module receives implausible signal from vehicle level sensor
  5. If implausible signal is received from vehicle level sensor, perform calibration, refer to «43 K2 CALIBRATION - AS OF MY 2003 (ALL MODELS EXCEPT CAYENNE S TIO TITAN)»(ref-274645-S37689639902007121900000) .
  6. Vehicle level sensor faulty
  7. Level control module faulty

Level control module, plug A

  1. Pin 65
  2. Pin 76

Level control module, plug B

  1. Pin 83

Front right vehicle level sensor, plug A

  1. Pin 1
  2. Pin 5
  3. Pin 6
WARNINGDanger of personal injury from lowering vehicle independently when working on and underneath the vehicle! The normal level must always be set and the level control switched off when the vehicle is raised with the jack or platform lift.
  1. Short circuit to B+ in the wiring of pin 85 of the level control module
  2. Short circuit to ground in the wiring of pin 85 of the level control module
  3. Open circuit in the wiring of pin 85 of the level control module
  4. Level control module receives implausible signal from compressor
  5. Compressor temperature sensor faulty
  6. Level control module faulty

Level control module, plug B

  1. Pin 85
  2. Pin 93

Level control system compressor, plug A

  1. Pin 3
  2. Pin 4

Scheme 93

Scheme 93: Compressor temperature
Scheme 93: Compressor temperature
Work instructionDisplay OKIf not OK
1Check compressor temperature sensorSwitch off ignition. Pull plug off level control system compressor. Measure resistance on level control system compressor plug between 'pins 3 and 4'.12.2 - 13.72 ohms at 20°C or see ' COMPRESSOR TEMPERATURE ' diagram. Go to Step 2Replace level control system compressor. --> End
2Check wiring between level control system compressor and level control module for short circuit to B+Pull plug B off level control module. Switch on ignition. Measure voltage between level control module plug B 'pin 85' and ground.< 0.3 V Go to Step 3Repair or replace wiring harness. --> End
3Check wiring between level control system compressor and level control module for short circuit to groundSwitch off ignition. Measure resistance between level control module plug B 'pins 85, 93' and ground.Infinity ohms Go to Step 4Repair or replace wiring harness. --> End
4Check wiring between level control system compressor and level control module for open circuitMeasure resistance between level control module plug B 'pins 85, 93' and level control system compressor plug A 'pins 3, 4'.< 5 ohms Go to Step 5Repair or replace wiring harness. --> End
5Replace level control module.> EndGo to Step 6
6Replace compressor.> End

DIAGNOSIS/TROUBLESHOOTING PROCEDURE

  1. Leak in the compressed air lines
  2. Short circuit to B+ in the wiring of pin 84 of the level adjustment control unit
  3. Short circuit to ground in the wiring of pin 84 of the level adjustment control unit
  4. Open circuit in the wiring of pin 84 of the level adjustment control unit
  5. Level adjustment control unit receives implausible signal from pressure transmitter
  6. Pressure transmitter faulty
  7. Level adjustment control unit faulty

Level adjustment control unit, connector A

  1. Pin 34

Level adjustment control unit, connector B

  1. Pin 84 'P signal'

Solenoid block, connector A

  1. Pin 8
  2. Pin 9 'P signal'
  1. Short circuit to B+ in the wiring of pin 34 of the level control module (cannot control level using the accumulator)
  2. Short circuit to ground in the wiring of pin 34 of the level control module
  3. Open circuit in the wiring of pin 34 of the level control module
  4. Level control module faulty

Note. If multiple valve faults (fault code 0805, 0806, 0807, 0808) or another relay fault (fault code 1399) are recorded, check the system's plug connections for correct contacts.

Level control module, plug A

  1. Pin 34

Solenoid block, plug A

  1. Pin 8
  1. Short circuit to ground in the wiring of pin 46 of the level control module (electrical fault in electric circuit)
  2. Short circuit to B+ in the wiring of pin 46 of the level control module (electrical fault in electric circuit)
  3. Open circuit in the wiring of pin 46 of the level control module (no signal/communication)
  4. Selector switch faulty
  5. Level control module faulty

Level control module, plug A

  1. Pin 46

Level control module

  1. Pin 7

Scheme 94

Scheme 94: Bushing on selector switch
Scheme 94: Bushing on selector switch
  1. Mechanical fault (connecting rod bent or tire failure/spare tire)
  2. Vehicle level sensors need to be calibrated, refer to «43 K2 CALIBRATION - AS OF MY 2003 (ALL MODELS EXCEPT CAYENNE S TIO TITAN)»(ref-274645-S37689639902007121900000) .
  1. Mechanical fault (detected by a plausibility check)
  2. Vehicle level sensors need to be calibrated, refer to «43 K2 CALIBRATION - AS OF MY 2003 (ALL MODELS EXCEPT CAYENNE S TIO TITAN)»(ref-274645-S37689639902007121900000) .
  1. Valve operating time exceeded (upper limit value exceeded) due to excessive lifting and lowering of the vehicle, resulting in deactivation of function.

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