Alternator Test; Limp-Home Modes; Driver Information Display Limp-Home Mode; Lower Priority I/O-Ea & I/O-Eb Modules For Breakdown Service - PREVOST H3-41 Maintenance Manual

SECTION 06: ELECTRICAL
4.3

ALTERNATOR TEST

Anytime an alternator is suspected of being
defective, this test will help you when performing
your own alternator power output test, without
the need to disconnect the alternator power
cable. A clamp-on current meter is required.
To initiate the test, use the Driver Information
Display (DID) DIAGNOSTICS menu. Select
VEHICLE TESTS submenu and then FORCE
ALTERNATORS TEST. Press ENTER button to
start the test. This feature will activate one
alternator at a time during 5 seconds, cycling
between alternator 1, 2 & 3.
Alt-1 (5 sec.)
Alt-2 (5 sec.)
Alt-3 (5 sec.)
To exit test, press ESCAPE button, select
TERMINATE TESTS & FORCED STATES
submenu and then press ENTER button twice.
5.

LIMP-HOME MODES

5.1 DRIVER INFORMATION DISPLAY LIMP-
HOME MODE
In case of malfunction of unavailability of the
steering wheel UP, DOWN, ENTER & ESCAPE
buttons, it is still possible to scroll through the
DID menus using the multi-function lever.
To activate the DID limp-home mode, press and
hold the courtesy blinkers button for 3 seconds.
32 PA1621 Maintenance Manual All Series | Revised Sept 2019
The limp-home mode will cancel if no switch is
pressed before a 1 minute delay after activation.
Limp-home mode action
Activate RH flasher
Activate LH flasher
Activate headlamps call switch
Press courtesy blinkers button
FIGURE 12: MULTIFUNCTION LEVER
5.2 LOWER PRIORITY
MODULES
SERVICE
Modules AE42 (I/O-EA) and AE43 (I/O-EB)
affect lower priority functions. These modules
can therefore be used as spare parts for
breakdown service while on the road.
Functions lost if AE42 is removed and used as
spare part:
Kneeling system,
•
Functions lost if AE43 is removed and used as
spare part:
Cruise control & ACB,
•
Baggage compartment door luck,
•
Door ajar,
•
• Tire Pressure Monitoring System,
5.3 FORCED ACTIVATION
COOLING FANS
To prevent the engine from overheating in case
of malfunction of the cooling fans activation
system, it is possible to force activation of the
CAC & radiator fans.
UP
DOWN
ENTER
ESCAPE
I/O-EA & I/O-EB
FOR BREAKDOWN
OF THE