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Section F
69 - 8
Powershift Gearbox - 6 speed
ShiftMaster Diagnostics - User Guide
11. Dashboard
This offers a simple uncluttered display showing;
Requested Gear
This is the demand from the driver.
Selected Gear
This is the actual gear being selected by the ECU.
Note: The driver Request Gear is not always the same as
the Selected Gear, e.g. when the ECU blocks shifts when
offering protection.
Transmission Speed
This is the current transmission output speed which is
directly related to the road speed (through axle ratio and tyre
size). The transmission speed sensor is located next to the
output gear and detects the passing of the gear teeth. The
sensor has a fixed installation, no adjustment is necessary.
The Transmission Speed value is a frequency reading and is
displayed in Hertz (Hz), or teeth per second.
This signal is used by the ECU to determine gear-shifting
and protection strategies.
12. ECU Status Page
This page gives a detailed picture of how the ECU is
operating.
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Transmission
Service Procedures
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Information in this display is constantly updated in real-time.
(Some older PCs may experience a slight delay in updating
this page, but usually only less than one second.)
The left hand side shows the inputs to the ECU, their status
indicated by green LEDs.
The right hand side shows the outputs from the ECU, their
status shown by red LEDs.
The exact colour of the LED indicates the status of that
feature.
A key in the bottom left corner of the main window explains
the colours.
The following is a brief explanation of each feature. For
further information and examples of typical scenarios please
refer to the accompanying Fault Finding Guide accessible
via the Help menu.
Transmission Speed
This is exactly the same signal as explained in the previous
section.
Gears
Inputs: The items on the left show the signal lines
connected to the gear selection lever. This lever if the left
hand half of the control lever assembly mounted on the
steering column.
Outputs: The items on the right are the power signals going
down to the transmission solenoid valves. The LEDs will
indicate which solenoids are being energised. Error
detection on the output electrics is continually running. If any
output were to develop a fault (e.g. open circuit or short
circuit) then the LED will turn yellow. Fix the fault and the
LED will revert back to red.
During certain gear-shifts the ShiftMaster ECU will perform
electrical Modulation to improve gear-shift quality. The ECU
does this by adding delays to off-going and/or on-coming
clutches and so overlapping energised outputs. These
delays are in the order of a few hundred milli-seconds but it
is sometimes long enough to be observed on the status
LEDs. Thus, during certain shifts it is quite normal to observe
more than 2 outputs ON at any one time.
Section F
69 - 8
S404480
Issue 1
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