DME 7.8 DME 7.8 0 · Driving cycle

DME 7.8 DME 7.8 0 Driving cycle A driving cycle consists of the engine start, an arbitrary journey (with idling, part load, constant-speed driving and trailing throttle phase components) and the time after switching off the engine until a new start. For faults to be frozen/remedied, the driving cycle must also partly include the procedure of the respective diagnosis. Ready status The menu item "Ready status" displays whether the required fault checks of the OBD system have been performed since the last 'Clear fault memory' or 'Reset'. If a check is OK, testing for a Ready status once is sufficient; if the system is faulty, the Ready status is reached after testing twice. The Ready status is important for example when testing the exhaust; it detects if the fault memory has been cleared before test- ing a faulty vehicle without remedying the cause(s) for the fault entry. The Ready status is displayed for the following subsystems: ♦Catalytic conversion ♦Tank ventilation system ♦Secondary air system ♦Oxygen sensor ♦Oxygen sensor heating Once a subsystem has attained the Ready status, this is maintained until the next 'Clear fault memory'. Note! ♦In some countries (currently USA, Canada), after intervention on the DME, it is necessary to reset the Ready status before deliv- ering the vehicle to the customer. ♦To do this, perform the short tests recommended in the 9588 Porsche System Tester ll or a test drive to obtain the rele- vant diagnostic conditions (these can be found for each system at the beginning of the instructions for finding P codes in this manual). ♦Please refer any questions on this to your importer. Freeze frames ('frozen fault boundary conditions' specified by the authorities) Freeze frame data is standardised and records operating conditions in the event of a (first) fault. Freeze frames have different priorities. 2470 INTRODUCTION 0-PEIN page 5 Printed in Germany – 14, 2003 PEIN2DME78