WORKHORSE CUSTOM CHASSIS
Service Manual
Automatic Transmission – Allison
2007 W Series
© 2006 Workhorse Custom Chassis — All Rights Reserved
SECTION
7.2
PAGE
103
2007 W Series Chassis
WSM082106
automatic transmission fl uid pressure manual valve
position switch assembly. ON represents a 0 voltage
signal. OFF represents a B+ voltage signal.
Trans. Fluid Temp.:
Displays -40°C to +151°C (-40°F
to +304°F). This parameter is the input signal of the
transmission fl uid temperature sensor. The transmission
fl uid temperature is high when the signal voltage is low,
0 volts, and transmission fl uid temperature is low when
the signal voltage is high, 5 volts.
Transmission Hot Mode:
Displays On or Off. This
parameter monitors the transmission fl uid temperature
(TFT). Yes indicates the transmission fl uid temperature
has exceeded 135°C (275°F).
Transmission ISS:
Displays 0-8,192 RPM. This
parameter measures the rotational speed of the input
shaft expressed as revolutions per minute (RPM).
Transmission OSS:
Displays 0-8,192 RPM. This
parameter measures the rotational speed of the
transmission output shaft expressed as RPM. On four-
wheel drive applications, the transfer case output shaft
speed is measured.
Turbine Speed:
Displays 0-8,192 RPM. This parameter
indicates the rotational speed of the torque convertor
turbine shaft expressed as RPM. In commanded gears
1, 2, 3, and 4, the turbine speed equals the input speed.
4WD Low:
Displays Enabled or Disabled. This
parameter is the signal state of the four-wheel drive low
circuit. Enabled indicates a 0 voltage signal requested
4WD low. Disabled indicates a B+ voltage signal, which
does not request 4WD low.
DIAGNOSTIC TROUBLE CODE (DTC) TYPE
DEFINITIONS
The DTC Type Defi nitions contain the characteristics
for all types of DTCs. Each DTC type may or may not
be found in this section. The DTC type is based on the
action that the control module takes when storing DTC
information, and whether or not the control module
illuminates a service lamp or displays a message on a
driver information center (DIC). The DTC descriptions
in the Diagnostic Trouble Code List/Type are listed
in numeric order and indicate the DTC types for
domestic and export vehicle applications. Each DTC is
categorized into one of the following types:
Type A
This DTC is emissions related. The control module
stores the DTC in History, Freeze Frame and Failure
Records during the fi rst trip in which the conditions
for setting the DTC are met. The control module also
illuminates the malfunction indicator lamp (MIL) during
the fi rst trip in which the conditions for setting the DTC
are met.
Type B
This DTC is emissions related. The control module
stores the DTC in Failure Records during the fi rst trip in
which the conditions for setting the DTC are met. The
control module stores the DTC in History and Freeze
