Workshop

HYDRA-MATIC 6L80 (6 Speed)

P
R
N
+
-
DM/S
DRIVER SHIFT CONTROL (DSC)
SHIFT QUADRANT
MDNRP 2 1
Possible Variations
STANDARD SHIFT QUADRANT
Figure 2
Figure 3
- Manual 2nd just adds more performance for
congested traffic and hilly terrain. It has the same
starting ratio (1st gear) as the Drive range, but
prevents the transmission from shifting above 2nd
gear. Manual 2nd can be used to retain 2nd gear for
acceleration and engine braking as desired. Manual
2nd can be selected at any vehicle speed, but will
downshift into 2nd gear, only if vehicle speed is low
enough not to over-rev the engine. This speed is
calibrated in the TCM.
- Manual 1st has the same starting ratio as Drive
range but prevents the transmission from shifting
above 1st gear. Manual 1st can be used for heavy
towing and engine braking as desired. Manual 1st can
be selected at any vehicle speed but will downshift
into 1st gear, only if vehicle speed is low enough not
to over-rev the engine. This speed is calibrated in the
TCM.
2
1
Standard Shift Quadrant (Cont'd)
Driver Shift Control (DSC) Quadrant
Driver Shift Control (DSC) Quadrant (Cont'd)
Some vehicles are equipped with Driver Shift
Control (DSC) version of the selector system, as
shown in Figure 3. This configuration allows the
driver to manually shift between forward gears.
SHIFT QUADRANTS (CONT'D)
- Park position enables the engine to be started
while preventing the vehicle from moving. For safety
reasons, the vehicle's parking brake should always be
used in addition to the "Park" position. Park position
should not be selected until the vehicle has come to a
complete stop.
- Reverse enables the vehicle to be operated in a
rearward direction.
- Neutral position enables the engine to start and
operate without driving the vehicle. If necessary, this
position should be selected to restart the engine while
the vehicle is moving.
- Drive range should be used for all normal driving
conditions for maximum efficiency and fuel
economy. Drive range allows the transmission to
upshift and downshift in each of the six forward gear
ratios, according to the normal shift pattern that is
programed in the TCM.
- In the M/S (Manual or Sport) position, the
driver may manually select the range of gears by
tapping the selector lever towards "+" or "-" to cause
an upshift or downshift, as shown in Figure 3. The
transmission will shift up or down depending on the
request that is made by tapping the selector lever.
P
R
N
D
M/S
AUTOMATIC TRANSMISSION SERVICE GROUP
Technical Service Information
5
Copyright © 2007 ATSG
Copyright © 2007 ATSG

Leave a Reply

Your email address will not be published. Required fields are marked *