Copyright © 2004 General Motors Corp.
1–7
GENERAL INFORMATION
b. General Description.
Several transmission
con
fi
gurations are available within the 1000 and 2000
Product Families.
1–5.
DIAGNOSIS
NOTE:
Refer to the TS3192EN, 1000 and 2000 Product Fam-
ilies Troubleshooting Manual, for in-depth trouble-
shooting procedures.
a. Before Starting.
Before attempting to repair the
transmission, identify the faulty condition and its
probable cause.
b. CHECK TRANS Light
1. The
CHECK TRANS
light is original equip-
ment manufacturer (OEM)-supplied and usu-
ally located on the vehicle’s instrument panel.
2. The
CHECK TRANS
light is illuminated
brie
fl
y during vehicle start-up as a bulb check.
NOTE:
The CHECK ENGINE light may serve the CHECK
TRANS function for vehicles which are compliant
to industry On Board Diagnostics II (OBD-II) re-
quirements.
3. When the
CHECK TRANS
light is “ON”,
shifts may be restricted by the Transmission
Control Module (TCM) as follows:
•
When the TCM senses abnormal
conditions.
•
The transmission may be locked in the
range it was in when the problem was
detected.
•
The transmission may continue to operate
with inhibited shifting.
•
The TCM may not respond to shift selector
requests.
•
Direction changes and shifts from neutral-
to-range may not occur.
•
Whenever the
CHECK TRANS
light is
displayed, the TCM logs a diagnostic code
in memory. These diagnostic codes can be
accessed through the PC-based Allison
DOC™ diagnostic systems.
NOTE:
Diagnostic codes can be logged without illuminating
the CHECK TRANS light. This occurs when the
TCM senses a problem, but determines the problem
won’t cause immediate transmission damage or
dangerous performance.
c. Range Inhibit Indicator
1. Some conditions detected by the TCM cause
the transmission to be locked in one range.
When this occurs, the torque converter clutch
is automatically disengaged. Shifts out of
N
(Neutral) may be inhibited.
1000*
Heavy-duty automatic transmission with
parking pawl
Maximum GVW 19,850 lb
Maximum GCW 26,000 lb
2000
2100
2500*
Heavy-duty automatic transmission
without parking pawl
Maximum GVW 30,000 lb
Maximum GCW 30,000 lb
2100 MH
2500 MH*
Heavy-duty automatic transmission with-
out parking pawl
Limited release in motorhome
applications only
Maximum GVW 28,000 lb
Maximum GCW 28,000 lb
1000 MH
2200 MH*
Heavy-duty automatic transmission with
parking pawl
Limited release in motorhome
applications only
Maximum GVW 28,000 lb
Maximum GCW 28,000 lb
2200
2400*
Heavy-duty automatic transmission with
parking pawl
Maximum GVW 26,000 lb
Maximum GCW 26,000 lb
*
GVW rating, GCW rating, or OEM axle rating, whichever is less.
WARNING!
If ignition is turned “OFF” and then “ON” while
the CHECK TRANS light is displayed, the trans-
mission may remain in neutral until the code is
cleared. Leave ignition “ON” until you are in a
safe place to stop.
Содержание 1000 EVS
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