232
2009
K
night
Chassis Information - 1
0
Each time the engine is started the CHECK
TRANS icon will light, then turn off after a
few seconds. This momentary lighting is to
indicate that the status light circuit is working
properly. If the CHECK TRANS light does
not illuminate during start up, or if the light
remains on after start up, the transmission
system should be checked immediately.
Continued illumination of the CHECK
TRANS light during vehicle operation (other
than start up) indicates that the ECU has
signaled a diagnostic code. Illumination of
the CHECK TRANS light is accompanied by
a flashing display from the shift selector. The
shift selector display will show actual range
attained and the transmission will not respond
to shift selector requests.
Indications from the shift selector are
provided to inform the operator that the
transmission is not performing as designed
and is operating at reduced capabilities. Before
turning the ignition off, the transmission may
be operated for a short time in the selected
range in order to “limp home” for service
assistance. Service should be performed
immediately in order to minimize potential
damage to the transmission.
When the Check Trans icon illuminates the
keypad will not respond to command and the
transmission generally will downshift to 4th
gear. The torque converter will not “lock-up”
and engine speed is automatically reduced.
Direction changes (i.e. forward to reverse) will
not be allowed. Locate a safe secure place to
park the motorhome. If the engine is shut off,
then engaged after a Check Trans indication,
the transmission remains in Neutral until the
fault causing the Check Trans light has been
corrected.
NOTE
Contact an authorized Allison
Transmission service center whenever
a transmission related concern
arises. For some problems, fault
codes may register without the ECU
activating the Check Trans indicator.
An authorized Allison Transmission
Service center will have the equipment
to check diagnostic codes and correct
problems that may arise.
Diagnostic Codes:
The shift selector can be used to display
transmission malfunctions as numerical codes.
Each code is a two-digit main code and a
two-digit sub code. These codes will fall in
two classes: active and inactive. Active codes
are codes currently affecting the ECU process
and transmission operation. Inactive codes
are retained in memory but may not affect
the ECU process or transmission operation.
A service technician will activate Diagnostic
mode or hook an electronic display (Pro-Link)
to the data plug to retrieve diagnostic codes.
A maximum of five codes, D1 to D5, may
be listed at one time. The highest priority
code will be listed in D1. The Mode button
will enable selection of sequential codes.
Allison 4th Generation controls list each code
consisting of five characters. The first being a
letter followed by a four digit number string.
The most severe or recent code is listed in the
ECU memory first with a maximum of five
codes being d1 to d5 possibly listed at the
same time. When new codes are added, the
oldest inactive codes will be dropped.
To Display Diagnostic Codes:
Stop the motorhome at a safe location.
Apply the parking brake.
Simultaneously press the up and down
arrows once to enter oil level display
mode. Then press the up and down
arrows again to enter diagnostic mode.
The codes will display one digit at a
time or two characters at a time on 4th
Generation controls.
Press the mode button to scroll through
the codes.
Record all diagnostic codes that are
displayed. The codes then can be
used by an Allison Service Center for
evaluation and repair.
Inactive codes can be cleared
by holding the Mode button for
approximately three seconds. 4th
Generation controls require holding the
Mode button for ten seconds to clear
both inactive and active codes.
Some codes are self-clearing while others
will require service or ignition on/off cycles to
clear.
Summary of Contents for 2009 Knight
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Page 46: ...42 2009 knight Driving Safety 2 Weighing Procedure Worksheet Example Worksheet 020255b conv...
Page 47: ...43 2009 knight Driving Safety 2 Weight Record Sheet Actual Worksheet 020255b 020263...
Page 52: ...48 2009 knight Driving Safety 2 Notes...
Page 152: ...148 2009 knight Water Systems 6 Notes...
Page 182: ...178 2009 knight Electrical Systems House 8 Notes...
Page 201: ...197 2009 knight Electrical Systems Chassis 9 engine no start flow chart...
Page 202: ...198 2009 knight Electrical Systems Chassis 9 Notes...
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Page 260: ...256 2009 knight Index Notes...