Tire Monitoring System: Application and ID

Tyre pressure monitoring system

Introduction

General instructions/safety instructions

WARNING: Despite the advantages of the tyre pressure monitoring system, it is the responsibility of the driver to make the appropriate adjustments and to ensure that wheels are in the proper condition.

NOTE:
- The serial numbers of the wheel electronics must be read in when replacing wheel electronics, the control module or entire wheels with active wheel electronics. This can be done using the Porsche System Tester II No. 9588 or by driving for approx. 20 minutes. The tyre type and the size of the new wheels must also be recorded. Otherwise the system is not active.
- New wheel electronics (spare parts) are only active (enabled) if they are subjected to pressure (>2 bar) for longer than 2 minutes.
- The standard spare wheel is not supplied with wheel electronics and is therefore not monitored.
- If one or more spare wheels with active wheel electronics are carried (including a spare wheel that is carried externally), this can lead to faults and error messages in the system.
- If a full-size spare wheel that is carried externally is coded, the customer will always receive a reminder (in the instrument cluster), after approx. 6 months, to check the pressure of the spare wheel.
- Additional tyre sizes can be entered for various tyre types using the Porsche System Tester II No. 9588.
- Faults can occur in the system if temperatures rise above 120 °C on the wheel electronics or if there is radio interference as a result of strong transmitters. The faults are indicated in the instrument cluster.

WARNING:
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.

WARNING:
Danger of injury and damage as a result of the vehicle's unusual handling behavior caused by disconnected plugs or components.
- Never disconnect plugs while driving or drive with them disconnected.
- Drive only with fully installed and connected parts.

Troubleshooting procedure
If the fault is currently 'not present', please check the following:
- Diagnostic conditions are met
- 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

Diagnostic conditions

NOTE:
Important: Always connect a suitable battery charging device to the vehicle electrical system battery 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 that are present.

Diagnosis/troubleshooting

NOTE: The fault memory Info key [F8] on the Porsche System Tester II No. 9588 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
1. Erase fault memory
2. Satisfy the requirements listed under 'Diagnostic conditions'
3. Read out fault memory again