PREVOST LE MIRAGE XLII BUS SHELLS User Manual

Section 07: TRANSMISSION
PA1225
14
17. Install transmission dipstick and filler tube.
18. Install cross member under transmission.
19. Install engine splash guards.
20. Adjust the retarder pressure to 80 ± 3 psi with
the air pressure regulator. For more
information refer to Section 12, "BRAKE AND
AIR SYSTEM", under heading "AIR
PRESSURE REGULATOR". The air pressure
regulator is located in the engine
compartment, above the rear junction box
(Fig. 12).
FIGURE 12: AIR PRESSURE REGULATOR (TYPICAL) 07037
23. Make sure that the drain plug is in place, and
then remove the transmission dipstick and
pour approximately 24 US quarts (23 L) of
automatic transmission fluid through the filler
tube. Check and adjust oil level.
CAUTION
Do not overfill the transmission. Overfilling can
cause oil aeration (milky appearance) and
overheating. If overfilling occurs, drain oil as
required to bring it to the proper level.
9. TROUBLESHOOTING
9.1 ALLISON AUTOMATIC TRANSMISSION
For complete information about Allison
transmission troubleshooting, refer to ‘’Allison 4
th
Generation Controls – Troubleshooting Manual:
3000 and 4000 Product families (TS3989)”.
9.1.1 4
th
Generation Transmission Control
Module
The Allison automatic transmission has a new
Transmission Control Module (TCM) which
involves specific diagnostic incident codes. The
TCM is located in the coach rear junction box.
FIGURE 13: TRANSMISSION CONTROL MODULE 07140
TCM Replacement
The TCM is a non-serviceable electronic device.
When it fails, it must be replaced using the
following procedure:
o Open the coach engine compartment R.H.
side door;
o Open the rear junction box in order to get
access to the TCM;
o Remove the electrical cable connectors;
o Unscrew the TCM unit;
o Replace by reversing the procedure.
CAUTION
Place the ignition key switch to the ‘’OFF’’
position.
9.1.2 Diagnostic Troubleshooting Codes
(DTC) — Allison 4th Generation Controls
Diagnostic codes (DTC) are numerical
indications relating to a malfunction in
transmission operation. These codes are logged
in a list in the TCM memory with the most
severe or most recent code listed first. A
maximum of five codes (numbered d1 to d5)
may be listed in memory at one time. As codes
are added, the oldest inactive code is dropped
from the list. If all codes are active, the code with
the lowest priority that is not included on the
severity list is dropped from the list.
Diagnostic codes (DTC) and code information
may be accessed through the pushbutton shift
selector or using an Allison DOC™ diagnostic
tool.

PREVOST LE MIRAGE XLII BUS SHELLS Specifications

General

Brand	PREVOST
Model	LE MIRAGE XLII BUS SHELLS
Category	Buses
Language	English