Reading and Clearing Diagnostic Trouble Codes

General Information On The Fault Memory

Fault code setting conditions
Fault codes can be set in several circumstances, e.g.:
- battery disconnected.
- plug connections disconnected.
- power failure.

In these circumstances, no fault is present in the system and the fault memory must be erased.

Display * in the menu Control modules and menu PCM2 MOST component check.
Different required and actual installed components lists

When the automatic control module search is complete, the following display * appears in front of the control module description PCM2 in the Control modules menu, as well as in the PCM2 MMI function selection in front of the entry MOST required installed components list if the Porsche System Tester II 9588 establishes a difference between the required and actual installed components list and there is no fault code in one of the fault memories of the MOST control modules.

If there is a fault code present in one of the MOST control modules, the display * is only shown in the PCM2 MMI function selection in front of the line MOST required installed components list.

If there is a display in the menu Control module, an existing fault code has priority and a # is set.

Fault memory Info key F8
In order to be able to assess the fault exactly, the fault memory Info key F8 must be pressed. This information should be saved using the Save key F4 and printed out. If a fault code is stored with "not present" status and no other problems are present, then the fault memory must be erased.

Open circuit - short to ground / voltage short / version; vehicle parameters / counter

Fault counter When a fault first occurs, a fault entry is made in the fault memory and the counter is simultaneously set to 50.

If a fault is present, the counter is incremented by 1 for each "ignition on". The maximum count is 255.

The counter is decremented if the fault is no longer present. The fault memory is automatically erased when the counter reaches 0.

If the error occurs again when the counter is between 1 and 49, the counter is reset to 50.

Lock status of MOST ring The value indicates the status of the MOST ring when the fault occurred.
- lock
- unlock

Supply voltage The value indicates the voltage at the time the fault occurred.

Supply voltage fault type The display shows which fault type has occurred:
- no fault type
- not present