WORKHORSE CUSTOM CHASSIS
Service Manual
Automatic Transmission – Allison
2007 W Series
© 2006 Workhorse Custom Chassis — All Rights Reserved
SECTION
7.2
PAGE
11
2007 W Series Chassis
WSM082106
TRANSMISSION INTERNAL MODE SWITCH LOGIC
Range
A
B
C
P
P
OFF
ON
ON
OFF
R
OFF
OFF
ON
ON
N
ON
OFF
ON
OFF
D
ON
OFF
OFF
ON
*M
OFF
OFF
OFF
OFF
1
OFF
ON
OFF
ON
*L1
OFF
OFF
OFF
OFF
*L2
OFF
OFF
OFF
OFF
*L3
OFF
OFF
OFF
OFF
*L4
OFF
OFF
OFF
OFF
*L5
OFF
OFF
OFF
OFF
*L6
OFF
OFF
OFF
OFF
ON = Open Circuit
OFF = Grounded Circuit
*M mode allows TAP Up/TAP Down feature functionally between 1st through 6th ranges.
SOLENOID AND CLUTCH CHART (NORMAL MODE)
Solenoid and Clutch Chart (Normal Mode)
Range
Status
Logic
State
Clutch to
Line
Pressure Control Solenoids
Shift Solenoids
TCC
Sol.
PCS1
PCS2
SS1
SS2
SS3
Steady State
R
--
De-energized; Low and Reverse
Clutch Applied
Energized; 3rd, 5th, and Reverse
Clutch Applied
ON
ON
ON
OFF
Garage Shift
R-N
--
De-energizing; Low and Reverse
Clutch Applied
Energizing; 3rd, 5th, and
Reverse Clutch Trimming Off
ON
ON
ON
OFF
Garage Shift
N-R
--
De-energizing; Low and Reverse
Clutch Trimming On
Energizing; 3rd, 5th, and
Reverse Clutch Trimming On
ON
ON
ON
OFF
Steady State
N or P
--
De-energized; Low and Reverse
Clutch Applied
De-energized; Exhausted
ON
ON
ON
OFF
Upshift
N-1
--
De-energized; Low and Reverse
Clutch Applied
Energized; 1-2-3-4 Clutch
Trimming On
ON
ON
ON
OFF
