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Published 01-14-2021 Control # 707-01
CARRIER
TMS9000-2 SERVICE MANUAL
In addition, by operating the blink code switch as described
below, one of several diagnostic modes can be entered.
Refer to Diagnostic Mode Selection.
Blink Code Switch Activation
When activating the blink code switch:
1.
Wait at least two seconds after “ignition on.” (When
entering Reconfiguration Mode, refer to Reconfigure
ECU Mode.)
2.
For the ECU to recognize that the switch is activated
“on,” the technician must press for at least 0.1 second,
but less than five seconds. (If the switch is held for more
than five seconds, the ECU will register a malfunctioning
switch.)
3.
Pauses between pressing the switch when a sequence
is required, (e.g. when changing mode) must not be
longer than two seconds.
4.
After a pause of 3.5 seconds, the ECU will begin
responding with output information blinks.
Blink Code Timing
The ECU responds with a sequence of blink codes. The
overall blink code response from the ECU is called a
“message.” Each message includes, depending on the mode
selected by the technician, a sequence of one or more
groups of blinks. Simply record the number of blinks for each
sequence and then use the Active or Inactive Diagnostic
Trouble Codes Index for active or inactive trouble codes and
you will be directed to the page that provides troubleshooting
information.
Be aware of the following:
1.
Sequences of blinks illuminate the ABS indicator lamp
for half a second, with half-second pauses between
them.
2.
Pauses between blink code digits are 1.5 seconds.
3.
Pauses between blink code messages are 2.5 seconds.
4.
The lamp remains on for five seconds at the end of
messages.
Once the ABS indicator lamp begins displaying a sequence
of codes, it continues until all blink code messages have
been displayed and then returns to the normal operating
mode. During this time, the ECU will ignore any additional
blink code switch activation.
All trouble codes, with the exception of voltage and J1939
trouble codes, will remain in an active state for the remainder
of the power cycle.
Voltage trouble codes will clear automatically when the
voltage returns within the required limits. All ABS functions
will be re-engaged.
J1939 trouble codes will clear automatically when
communications are re-established.
Diagnostic Modes
In order to communicate with the ECU, the controller has
several modes that the technician can select, allowing
information to be retrieved, or other ECU functions to be
accessed.
Diagnostic Mode Selection
To enter the various diagnostic modes:
Active Diagnostic Trouble Code Mode
For troubleshooting, typically the Active and Inactive
Diagnostic Trouble Retrieval Modes are used. The
technician presses the blink code switch once and the ABS
indicator lamp flashes a first group of two codes, and if there
are more trouble codes recorded, this is followed by a
second set of codes, etc. (See Reconfigure ECU Mode for a
directory of these codes.) All active trouble codes may also
be retrieved using a handheld or PC-based diagnostic tool.
To clear active diagnostic trouble codes (as problems are
fixed), simply clear (or “self-heal”) by removing and re-
applying ignition power. The only exception is for wheel
speed sensor trouble codes, which clear when power is
removed, re-applied, and the ECU detects valid wheel speed
from all wheel speed sensors. Alternately, codes may be
cleared by pressing the diagnostic blink code switch three
times (to enter the Clear Active Diagnostic Trouble Code
Mode) or by using a hand-held or PC-based diagnostic tool.
Hand-held or PC-based diagnostic tools are able to clear
wheel speed sensor trouble codes without the vehicle being
driven.
Inactive Diagnostic Trouble Code Mode
The ECU stores past trouble codes and comments (such as
configuration changes) in its memory. This record is
No. of Times
to Press the
Blink Code
Switch
System Mode Entered
1
Active diagnostic trouble code retrieval
2
Inactive diagnostic trouble code retrieval
3
Clear active diagnostic trouble codes
4
System configuration check
5
Dynamometer Test Mode
7
1
1
To enter the Reconfiguration Mode, the switch must
be held in before the application of ignition power.
Once the power is supplied, the switch is released
and then pressed seven times.
Reconfigure ECU
Fo
r
Reference
Only
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