Section 06: ELECTRICAL
PA1553
34
4.11.1 Replacing IO-A Or IO-B Modules
o Set the ignition key to the ON position and
leave it in that position at all time while
performing this procedure.
o Open engine compartment R.H. side door,
trip circuit breaker CB2.
o Replace the module (for IO-B modules,
disconnect the green connector first, then
the grey one and finish with the black
connector. To disconnect the black
connector, slide downwards the red latch.
Remove the lower screw that holds the
cable attachment rod onto the floor portion
of the panel and flip the rod up, this will
relieve the IO-B module, see figure 19).
o Reset circuit breaker CB2. This engages the
automatic reprogramming.
o The telltale panel LCD display indicates
"CAN" until the reprogramming is complete.
Once completed, "CAN" disappears and the
temperature reappears.
o Check the SYSTEM DIAGNOSTIC menu of
the message center display (MCD). Select
FAULT DIAGNOSTIC and ELECTRICAL
SYSTEM. Verify the fault message to be
certain the module is reprogrammed. If the
module is not reprogrammed, the message
“Axx Not Responding” appears where Axx is
the module number (Ex: A41, A42…etc).
4.11.2 Replacing CECM Module
o Set the ignition key to the ON position and
leave it in that position at all time while
performing this procedure.
o Open engine compartment R.H. side door,
trip circuit breaker CB2.
o Replace the module.
o Reset circuit breaker CB2. This engages the
program transfer from the Master ID to the
CECM module (the back-up program is
inside the Master ID. The Master ID will
identify the CECM as being new and will
send the correct program to it). The telltale
panel LCD display indicates "CAN" during 3
minutes approximately. "CAN" disappears
and "---" is displayed alternately with "CAN"
(during that sequence, "---" will be displayed
up to 6 times and the audible alarm will
ring). Wait until "CAN" is replaced by "---"
that remains for more than 10 seconds. At
this point the MasterID module has finished
loading the program in the CECM.
o Go to the engine compartment R.H. side
area and trip circuit breaker CB2 once
again. Wait 1 second and reset it. This
engages I/O's modules automatic
reprogramming.
o The telltale panel LCD display indicates
"CAN" until the reprogramming is
completed. Once completed, "CAN"
disappears and the temperature reappears.
Check the SYSTEM DIAGNOSTIC menu of
the message center display (MCD). Select
FAULT DIAGNOSTIC and ELECTRICAL
SYSTEM. Check the error messages. All
modules appear in error but are not active. If
an active error appears for a module, this
one was not reprogrammed. In this case,
trip CB2 once again. Wait 1 second and
reset CB2. Re-verify the error messages
when "CAN" disappears from the telltale
panel LCD display.
o Do an error reset to remove all errors
(requires Password) from non-active
modules, leave the SYSTEM DIAGNOSTIC
menu and reopen to verify there are no
more errors.
5. BOSCH ALTERNATOR
Two 24 volt 140 amp., self regulated, belt driven,
air-cooled BOSCH alternators may be used in
the 24 volt electrical system (instead of the
DELCO 24 volt 270 amp. alternator).
Change the brushes and voltage regulator as
per “Repair and Testing Instructions for T1
Alternator 0120 69 552” every 100,000 miles
(160 000 fm) or once every two years,
whichever comes first.
Replace bearings as per “Repair and Testing
Instructions for T1 Alternator 0120 69 552” every
200,000 miles (320 000 fm) or once every four
years, whichever comes first.
NOTE
Use Polyrex EM grease (684922) when
repacking the bearings. Grease comes in 14.1
oz (400gr) cartridges.
Refer to Bosh T1 Alternator Maintenance
Manual Annexed at the end of this section.
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