Manufacturer

Warm-up cycle
The warm-up cycle is the time the engine requires to reach operating temperature. To fulfil the 'warm-up cycle' condition, the engine temperature on start-up must not be higher than a specified value (currently 44 degree C). The engine operating phase has to be long enough to produce a certain temperature increase (currently 21 degree K, but the temperature reached must be at least 54 degree C). The warm-up cycle condition is needed to decrement (count down) the fault erasing counter in the event of faults that have been recognized as "healed".

Driving cycle
A driving cycle consists of starting the engine, possibly a test drive (with a share of idling, partial load, constant driving, and overrunning phase) and the time between stopping the engine and starting again. For the purpose of shedding/healing faults, the driving cycle must sometimes include performing the relevant diagnosis.

Ready status
The "Ready Status" menu item indicates whether the OBD system has performed the required fault checks since the last time the fault memory was erased or reset. If a check proves to be OK, the one-off check is sufficient for a Ready status; if the system is faulty, the Ready status is achieved after a second check.

This is important, for example, for Inspection and Maintenance; this is where it is possible to detect whether the fault memory of a faulty vehicle was erased before the examination, without the cause(s) of the fault having been remedied.

The ready status is displayed for the following sub-systems:
- TWC conversion
- Fuel tank ventilation system
- Secondary air system
- Oxygen sensor
- Oxygen sensor heating

Once the Ready status has been reached for a sub-system, this is stored until the next time the fault memory is erased.

NOTE:
- In some countries (currently: USA, Canada), it is necessary to restore the Ready status following manipulation of the DME before the vehicle is supplied to the customer.
- To do this, you must perform the short test available in the Porsche System Tester II No.9588 or a test drive to achieve the relevant diagnostic conditions (these are listed for each system at the beginning of the test instructions for P codes in this manual).
- If you have any questions, please contact your nearest importer.