Section 10 --- Chassis Information
The Executive 2005
492
Transmission Check Indicator
The electronic control system of the transmission is programmed to inform the operator of a prob-
lem with the transmission system and reacts automatically to protect the operator, motorhome and
transmission. When the Electronic Control Unit (ECU) detects a DO NOT SHIFT (DNS) condition
the ECU restricts shifting, displays the CHECK TRANS warning on the LCD and registers a fault
code.
NOTE:
For some problems, fault codes may be registered without the ECU activating the
CHECK TRANS warning. An Allison Transmission authorized service outlet
should be consulted whenever there is a transmission related concern. They have
the equipment to check diagnostic codes and correct problems which may arise.
If the CHECK TRANS warning remains on after start up, the transmission system should be
immediately checked.
Continued display of the CHECK TRANS warning during vehicle operation indicates that the
ECU has signaled a diagnostic code. The CHECK TRANS warning is accompanied by a flashing dis-
play from the shift selector. The shift selector display will show actual range attained and the transmis-
sion 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 trans-
mission.
When CHECK TRANS displays on the LCD, 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 has been corrected.
Diagnostic Codes:
The diagnostic codes are numerical representations of malfunctions in the transmission operations.
Each code is a two digit main code and a two digit sub code. The codes, when detected, are logged in
the ECU memory. These codes will fall in two classes: active and inactive. Active codes are codes currently
effecting the ECU process. Inactive codes are retained but may not effect the ECU process. The diag-
nostic mode must be entered. 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.
To Next Page
Loading...
