PREVOST LE MIRAGE XLII BUS SHELLS, Руководство по обслуживанию

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Section 06: ELECTRICAL
PA1564
31
Problem/Symptom Probable Causes Actions
Fire alarm telltale light
and audible alarm always
ON and there is no fire or
high temperature in the
engine compartment Short-circuited fire sensor or
defective sensor Prior to start the vehicle, cycle the ignition
key to the ON position, OFF position and
then ON position again and then start the
vehicle. This will deactivate the fire alarm
function. This has to be repeated each
time the vehicle is re-started.
The vehicle is parked and
the electrical horn is acti-
vated to indicate a fire in
the engine compartment
but there is no fire Short-circuited fire sensor or
defective sensor Cycle the ignition key between the ON
and OFF position twice within 3 seconds.
This will deactivate the fire alarm function.
This has to be repeated each time the
vehicle is parked.
A single light, a group of
LED lights or another
function of the vehicle is
not functioning The multiplex outputs are
protected in current by an
internal “soft-fuse”. When an
output is shorted, it turns
OFF and stays OFF until the
"soft-fuse" is reset Turn the ignition key to the OFF position
and turn to the ON position again. This
resets all "soft –fuses".
No backlighting in the
instrument cluster Circuit breaker CB9 is tripped
or fuse F21 blown. Check / reset circuit breaker CB9
Check / replace fuse F21.
The radiator fan clutch
does not function and the
engine is overheating 1. Set the ignition key to the ON
position.
2. Activate the dashboard Telltale Light
Test switch 3 times within 4 seconds.
3. In the engine compartment, set the
starter selector switch to REAR
START and then start the engine
from the rear.
While in this mode, the rear start push-
button can be used to manually engage
the fan clutch. The Multiplex system
knows when the engine is already
running, and it will not activate the starter.
4. Press the push-button one time to
engage the clutch in 1
st
speed, press
a second time to engage in 2
nd
speed, press a third time to stop the
fan, press once again to return to 1
st
speed.
If the fan clutch does not engage using
this procedure then the clutch is faulty or
the wiring between the multiplex module
and the clutch is faulty. Mechanically lock
the fan clutch as described in section 05:
COOLING
SYSTEM of the maintenance
manual.