Introduction - Level control

Level control

Introduction

NOTE: The basic equipment of the Cayenne includes the level control module. The PASM function (Porsche Active Suspension Management) can also be integrated into the level control module. This enhanced control module is known as the level control module with PASM. The assembly and service number are identical for both control modules. The following troubleshooting diagnosis can be applied to both control module types. To simplify matters, the control module is always referred to as the level control module in the following description. An independent check must therefore be made to ascertain which type of control module is installed. The difference between the two types of control module, from the point of view of diagnostics, is that the fault codes 0142, 0143, 0144 and 0145 cannot occur for the level control module. In addition, various menu and selection functions in the 9588 Porsche System Tester II are not used.

NOTE: The following troubleshooting diagnosis has been geared only towards left-hand drive vehicles and describes only these types of vehicles. In some cases, specified plugs and sockets may be assigned differently in right-hand drive vehicles, which can lead to incorrect interpretations during troubleshooting and to unforeseen accidents. Therefore, no work should be performed on right-hand drive vehicles without the correct wiring diagram and troubleshooting diagnosis description.

Level control
Level control diagnosis software number: from 0101
Cayenne as of model year 2003

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:
- 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.--> 9; Rep. Gr. 9; Work instruction after disconnecting the battery
- After troubleshooting or repairs, erase the fault memory with the 9588 Porsche System Tester II and carry out a test drive.
- After the test drive, read out the fault memory again with the 9588 Porsche System Tester II.

DANGER:
Danger of injury through triggering of driver's airbag
- 9588 Never hang the Porsche System Tester II over the steering wheel.

WARNING:
Danger 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.

WARNING:
Danger 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.

WARNING:
Danger 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 'P' and put the hand brake on firmly.

CAUTION:
Danger 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.

CAUTION: The vehicle rises when the air springs are filled.

CAUTION:
Danger 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.:
- battery disconnected
- plug connections disconnected
- faulty coding
- power failure
- etc.

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

Troubleshooting procedure
Troubleshooting can only be performed when the fault is present. In other words, specific troubleshooting can only be performed in accordance with instructions (given under Diagnosis/troubleshooting for each fault code) if the entry has the status 'present' in the fault memory.

If the fault is currently 'not present', please check the following:
- Diagnosis conditions are met; if necessary perform a short test or test drive
- All plug connections and ground points of the affected current path are OK.
- Set all wiring harnesses of the affected current path to a state that corresponds to driving by pulling and shaking them (loose contact).

Diagnostic conditions

NOTE:
Important: Always connect a suitable battery charging device to the vehicle electrical system battery or to the designated jump-start terminal before starting diagnosis. All unnecessary loads must also be switched off.

NOTE:
The fault can only be identified if the requirements listed under 'Diagnostic conditions' are met. For this reason, the specified procedure must be observed after a fault is repaired:
1. Erase fault memory.
2. Satisfy the requirements listed under 'Diagnostic conditions'.
3. Read out fault memory again.

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.

Diagnosis/troubleshooting

NOTE: The fault memory Info key [F8] on the 9588 Porsche System Tester II can be used to access the 'extended fault memory'. The following information can be displayed:

Fault type
The following fault types are possible:
- no display
- upper limit value exceeded
- lower limit value not reached
- mechanical fault
- no signal/communication
- no or incorrect basic setting/adaptation
- short circuit to B+
- short circuit to ground
- implausible signal
- open circuit/short circuit to ground
- open circuit/short circuit to B+
- open circuit
- electrical fault in electric circuit
- please read out fault memory
- faulty
- cannot be checked now

Fault status
The following status types are possible:
- present
- 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.