Clearing Diagnostic Trouble Codes

Diagnosis/troubleshooting

NOTE: The fault memory Info key [F8] on 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 KESSY 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.
- 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.
- Conventional diagnosis/troubleshooting cannot be performed for some fault codes in the case of fault type 'short circuit to B+', which is displayed using the [F8] key in the 9588 Porsche System Tester II. The reason for this is that the ignition cannot be switched on when there is no control module connected. As a result, it is not possible to differentiate uniquely between a short circuit to terminal 30 and a short circuit to terminal 15. A thorough visual inspection of components and wiring must therefore be carried out before replacing a control module.
- The antennas in the rear bumper are wired in parallel. In addition, the antennas in the outer door handles are wired in parallel on the vehicle side. Given this, it is important to ensure during troubleshooting that various cut-off connections (door connectors, etc.) leading to other antennas are disconnected when taking measurements. Otherwise, the measurement results will not be meaningful. This is described in detail in the 'Diagnosis/troubleshooting' section of each fault code.
- Specified resistance values are based on an ambient temperature of 20°C.