Test Criteria

GENERAL NOTES
When starting and running the diagnosis, the ignition must be on. If the ignition was off during the diagnosis, diagnosis may be resumed after switching on the ignition and pressing the > key, i.e. the tester returns to the position that the diagnosis was interrupted at.

In the same manner, pressing the > key causes the diagnosis to be resumed from the position at which the diagnosis was interrupted, provided that specified criteria from the below table caused the diagnosis to be interrupted.
The diagnosis cannot be resumed, however, if the criteria are still present, e.g.: Heater: Oil temperature> 105 > 0° C.

Criteria causing the diagnosis to be interrupted
DME:
Speed > 2000 rpm

ABS/ABD:
Speed > 15 min/n

Tiptronic:
Speed > 1500 rpm

Airbag:
None

Alarm:
None

Heating:
1. Right-hand mixing chamber temp. > 80° C
2. Left-hand mixing chamber temp. > 80° C
3. Rear fan temperature> 95° C
4. Oil temperature> 105° C

Criteria for starting the diagnosis
DME:
Speed < 1200 rpm

ABS/ABD:
Road speed = 0 km/h

Tiptronic:
Speed < 1500 rpm
Road speed < 10 km/h (6 mph)

Airbag:
None

Alarm system:
None

Heating:
1. Right-hand mixing chamber temp. < 80° C
2. Left-hand mixing chamber temp. < 80° C
3. Rear fan temperature < 95° C
4. Oil temperature < 105° C

One troubleshooting requirement is that the testing person

- is familiar with the location of components, operation and technical relationships among the systems to be tested
- is able to read and analyze Porsche wiring diagrams
- is familiar with functions of circuits and relays
- is able to operate and analyze testers such as oscilloscope, voltmeter, ohmmeter and ammeter

The fault text in the display indicates a fault path, i.e. the fault may be present anywhere along the path, starting from the control unit across all connectors up to the component itself.

Before reading out the fault memory, do not try to locate the fault e.g. by pulling off connectors etc. as this would cause a fault to be stored in the fault memory.

Notes for System Tester 9288
If the Tester displays "...not present"", this may mean:
- Fault was not present when the test condition existed
- In case of an intermittent fault, the + symbol is also displayed.
Example: "...not present +"
- Remedy: Check path visually
- Test conditions under which the fault was tested do not correspond to the ambient conditions when the fault occurred. Remedy: Meet the ambient conditions displayed on the tester

If the tester displays "Signal unplausible", this may mean that
- the signal of the monitored component is not within the tolerance range

Explanation of the counter displayed on the Tester display
When the fault occurs for the first time, the counter is always set to 50. If a lower figure is displayed, calculate the difference between the 50 and the number indicated. This value is equal to the combination of - Starting procedure, meeting the test requirements and non-presence of the fault -. When the number 0 is reached, the fault path in the control unit is erased.
If the fault status changes from not present to present at a figure below 50, the counter is reset to 50. If a figure above 50 is displayed, the difference corresponds to the number of intermittent contacts that have occurred. Even when the values are above 50, the counter counts back to 0 when the above combination is met.