Porsche PIWIS Tester III, Service Training, Page: 77 / 103

CHAPTER1
PIWIS Tester III (PT3)
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11.2.1 Actual values/input signals
The ‚Actual values/input signals‛ menu item can be used to display current control
unit data on the PT3. This can be helpful if a complaint from a customer cannot be
confirmed using a fault memory entry or if a fault memory entry is stored in engine
speed, load or temperature ranges that seem implausible.
So-called actual values are values that are present in the control unit as sensor signals
and are converted into the corresponding value (that is displayed) by the control unit’s
computer and are available to the respective maps.
Input signals, on the other hand, are signals from actuators (switches, potentiometers,
switching valves, etc.) that are activated by the control unit’s driver and can change their
status. This change in status results in a signal change that is output to the tester by the
control unit and can be interpreted accordingly. Control units give the option of displaying
a large number of actual values. PT3 carries out pre-filtering in these cases. For the DME
control units, for example, groups are created for different subjects such as general
or load detection. The PT3 also includes an option for generating user-specific filters.
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Pressing the F4 button again will overwrite
a working log that has not been saved!
Current actual values/input signals
Switch displays by pressing [F8]. Switch to actual values/input signals selection by pressing [F11]
Overview
Extended
identifications Fault memory Actual values
input signals Drive links
checks Maintenance
repairs Coding/
program