Volvo Link System Service Bulletin page 19

Volvo Trucks North America, Inc.
Service Bulletin
Composite Fault Codes
If you receive a fault containing SID 250 or 254, you
must first check for other faults using VCADS Pro.
The reason is that a composite fault code, SID 250 or
254, is generated when one or more of a group of re-
lated fault codes exists. If a composite fault code is seen,
it is an indication that a related, more specific fault exists.
For example, data link fault codes are grouped under
SID 250. But SID 250 only indicates in a general way
that there is a data link fault. To view the more specific
faults, you must request faults using VCADS Pro or the
instrument cluster.
When faults have been requested, the composite fault
will display, along with the other fault(s). For example,
using VCADS Pro, the following faults may be shown:
MID 142–SID 250–FMI 9
MID 142–SID 245–FMI 9
In this example the problem lies in SID 245, the output
from the odometer, and not in SID 250. SID 250 is only
shown because SID 245 is a related fault – under the
"umbrella" of SID 250.
To summarize,
•
SID 250 = composite fault for other missing
J1587/1708 data link items, e.g. VIN, odometer, en-
gine hours, etc.
•
SID 254 = composite fault for physical hardware
problems, e.g. Inputs and outputs, GPS/Orbcomm
antennas, memory, etc.
Date
3.2002
Display for SID 250:
MID142
SAE J1708 Data Link
Communication Error
Active
Display for SID 254:
MID142
Controller #1
Component Failure
Active
Note: Actual text may vary slightly.
Group No.
397 001
19(32)
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