Electrical System Diagnostic Through The Did - PREVOST H3-41 Maintenance Manual

7.4 ELECTRICAL SYSTEM
THROUGH THE DID
Using the Driver's Info Display (DID), check if
there are active errors in the vehicle electrical
system. With the
highlight VIEW ACTIVE FAULTS and then
highlight ELECTRICAL to request a diagnostic
of the electrical system from the MCM. Press the
enter key. If applicable, the DID shows the
multiplex device ID, the fault messages or fault
codes recorded. When more than one fault is
recorded, an arrow pointing down appears on
the right of the display. Use the down arrow to
see all the fault messages.
Once the problem corrected, the DID still shows
the fault as being active. You have to leave the
VIEW ACTIVE FAULTS
approximately 20 to 30 seconds and then return
to VIEW ACTIVE FAULTS to request a new
diagnostic of the electrical system from the
MCM. The DID should display the fault as being
inactive. The MCM can store up to 20 faults, i.e.
the first 10 and the last 10. Middle faults will be
erased. If the breakers are tripped, the fault
history will be erased from the MCM memory.
NOTE
When performing
diagnostic with the DID, the message « No
Response ModA41» indicates either module
A41 is not responding due to a DL0 (BBUS
MUX) link problem or module A41 is not
powered. Similar messages exist for all
modules (A42, A43, A44, etc.).
NOTE
Because it is easier to do, check first if the
module is powered
connector. If it is, then you can conclude that
there is a DL0 (BBUS MUX) link problem.
Refer to DL0 (BBUS MUX) NETWORK
LAYOUT AND TROUBLESHOOTING in this
section.
DIAGNOSTIC
DIAGNOSTICS menu,
menu, wait
an electrical system
by probing on J3
PA1621 Maintenance Manual All Series | Revised Sept 2019
SECTION 06: ELECTRICAL
47