PREVOST LE MIRAGE XLII BUS SHELLS User Manual

Section 06: ELECTRICAL
PA1553
28
4.7 ROADSIDE TROUBLESHOOTING
Problem/Symptom Probable Causes Actions
Rear Start selector switch is
not in the NORMAL position.
1. Check that the rear start selector
switch is flipped up to NORMAL start
position and retry cranking.
2. Flip the rear start selector switch to
“Rear Start” and start the vehicle from
the rear.
Vehicle does not Start
CAN network problem
(Multiplex)
Module A53 not powered or
is defective
Engine ECM does not
receive the ignition signal
Engine ECM is not powered
If the vehicle does not start from the rear:
1. Verify that module A53 is powered:
a) Check the SYSTEM DIAGNOSTIC
menu of the message center
display (MCD). Select FAULT
DIAGNOSTIC and ELECTRICAL
SYSTEM. The message “No
Response ModA53, Active”,
indicates a power problem on the
module or a CAN network problem.
b) Check / reset circuit breakers CB1
and CB9.
c) Check / replace fuse F74 and F80.
d) Probe gray connector on module to
see if it is powered.
2. Verify that the engine ECM is
powered and get the ignition signal.
Check / replace fuse F78 and F79.
None of the Multiplexed
functions are operating,
including the basic limp-
home functions (door
opening, flashers, wipers
in speed 1)
Three dashes “---“ appear
in the telltale panel
instead of the outside
temperature
Note: The sunshades are
still functioning since
these are not multiplexed
The program version in the
CECM is different than the
program in the I/O modules
and the CECM is forcing all
I/O modules to stay inactive
1. Engage the auto-programming of the
I/O modules: Turn the ignition key to
the OFF position then turn the ignition
key ON. The letters CAN will appear
in the telltale LCD panel for about 3
minutes. Everything shall get back to
normal once the letters CAN are
replaced with outside temperature
display.
2. Try disconnecting the green
connector on the CECM and
reconnect.
3. If step 1 and 2 are ineffective, try
disconnecting the Master ID module
completely and repeat step 1.
4. Try disconnecting the CECM
completely, leave it disconnected and
see if the limp-home functions (start
of the vehicle from the engine
compartment, wipers speed 1,
flashers, etc ) are functioning.

PREVOST LE MIRAGE XLII BUS SHELLS Specifications

General

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