With Manufacturer's Scan Tool

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

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 control module plug connection are neither damaged nor corroded. The wires 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: A battery voltage of between 11.4 and 14.5 V is required for troubleshooting. This must be checked and provided if necessary. Voltages to components or fuses (input side) must be guaranteed on the vehicle electrical system.

Freeze frame (frozen fault boundary conditions)
Freeze frame data is standardised and records operating conditions in the event of a fault. Freeze frames have different priorities, which can be important when output to a Scan Tool. These can be viewed in the "extended fault memory" of the Porsche System Tester II No. 9588.

Furthermore, various operating conditions can be stored for each fault. These can provide reference points for determining the cause of a fault in the case of difficult diagnoses. These can be viewed in the "extended fault memory" of the Porsche System Tester II No. 9588.

Fault deletion counter
An individual deletion counter runs for every fault detected. It determines the storage duration of the related fault.

When a fault is first detected, the deletion counter is set to 80, for example (suspected fault).

If an unshedded fault is detected as having been remedied, the deletion counter is set to 10, for example (fault did not occur often enough to be confirmed).

Whenever a shedded fault is detected, the deletion counter is set to 40, for example. This value is retained until the fault is detected as having been remedied.

The deletion counter is decremented by 1 after every warm-up cycle if the fault in question is an unshedded fault or is detected as having been remedied (faults that are confirmed, but are not detected as having been remedied are not decremented in the deletion counter). If the deletion counter reaches the value 0, the fault is deleted from the memory.

Fault frequency counter
This counter shows how often a fault has recurred following its first occurrence. If the frequency value is 1, the fault has only occurred once. It can now be either "present" or "not present". The fault frequency counter is incremented whenever this fault recurs (the fault healing counter was decremented in the meantime, i.e. a check was performed and found to be OK). A higher value in the fault frequency counter can therefore indicate a loose contact.