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Copyright © 2004 General Motors Corp.
1000 AND 2000 PRODUCT FAMILIES SERVICE MANUAL
2. At the same time these events occur, a required
OEM-supplied
RANGE INHIBITED
light,
mounted on the dash or near the shift selector,
is illuminated. This noti
fi
es the driver that
shifting is inhibited and the shift selector may
not respond to shifts requested.
d. Allison DOC™ Personal Computer (PC)-
Based Diagnostic System.
Allison Diagnostic Opti-
mized Connection™ (Allison DOC™) provides tabu-
lar, graphical, and chart displays of real-time and re-
corded TCM data. A Help system is incorporated into
the Allison DOC™ software. Allison Diagnostic Opti-
mized Connection™ (Allison DOC™) software and
interface devices are available through Allison Trans-
mission tool sources.
1. A PC serves as the receiver/transmitter/display
medium that allows the service technician to
communicate with the TCM. Typical trouble-
shooting activities performed are installation
checkout and diagnostic trouble code (DTC)
retrieval.
2. The Allison DOC™ Help system contains in-
formation for performing the following:
•
Display (retrieve) DTCs. Transmission
diagnostic codes begin with P0, P1, U1, or
U2 followed immediately by three
additional numbers. For a complete list of
codes and more detailed information, refer
to 1000 and 2000 Product Families
Electronic Troubleshooting Manual
TS3192EN.
•
Clear diagnostic codes
•
Obtain transmission data such as input
speed or sump
fl
uid temperature
•
A solenoid test
•
Clutch diagnostics (including torque
converter clutch)
e. Troubleshooting When No Diagnostic Codes
Are Present
•
Always start with the basics:
— Make sure the shifter is in the appropriate
range.
— Check the
fl
uid level.
— Make sure batteries are properly connected
and charged.
— Make sure throttle is closed and engine
speed is below 900 rpm.
— Make sure electrical connections are
properly made.
— Check support equipment for proper
installation and operation.
•
If the shifting process is rough, give the shifts
time to adapt to “converged” state before
assuming there is a problem.
•
Refer to Section 7 “General Troubleshooting
of Performance Complaints” in the 1000 and
2000 Product Families Troubleshooting
Manual TS3192EN.
— These troubleshooting charts list a variety
of conditions that may or may not relate to
the TCM.
— Some conditions and suggested checks
include mechanical and hydraulic items.
•
If the troubleshooting charts refer you to a
TCM check, use the diagnostic code
troubleshooting information that best applies
to the situation.
f. Troubleshooting Intermittent Diagnostic
Codes.
Intermittent codes are a result of conditions
which are not always present.
1. When conditions causing the code exist, the
code is logged in memory. The code stays in
memory until it is manually cleared or cycled
out by forty code-free warm-up cycles.
2. When intermittently occurring codes exist,
check for the following items:
•
Dirty, damaged or corroded harness
connectors and terminals
•
Terminals not fully seated in connectors
•
Damaged harnesses (due to poor routing,
cha
fi
ng, excessive heat, tight bends, etc.)
•
Improperly mounted electronic control
components
•
Poor connector seals (where applicable)
•
Exposed harness wires
•
EMI generating components and
accessories
•
Loose ground connections
Summary of Contents for 1000 EVS
Page 26: ......
