COMMUNICATION PROTOCOLS
PID 194
- Transmitter System Diagnostic Code / Occurrence Count Table
update rate:
On Request only
format:
PID
Data
194
n a b c a b c a b c a b c a b c...
n -
Byte count of data that follows this character. This excludes
characters MID, PID 194 and n but includes a, b, c type
characters.
a -
SID or PID of a standard diagnostic code.
b -
Diagnostic code character
Bits: 1-4
FMI of a standard diagnostic code
Bit: 5
Byte (a) Identi
fi
er
1 - Byte (a) is a SID
0 - Byte (a) is a PID
Bit: 6
Type of Diagnostic Code
1 - standard diagnostic code
0 - expansion diagnostic codes (PID/SID
from page 2)
Bit: 7
Current Status of Fault
1 - fault is inactive
0 - fault is active
Bit: 8
Occurrence count
1 - count is included
0 - count is not included
c -
Occurrence count for the diagnostic code de
fi
ned by the
preceding 2 characters. The maximum occurrence count is 255.
Bit 8 of byte (b) of the diagnostic code is used to determine if
it is included.
comment:
Diagnostic codes are transmitted periodically while active. When the
active code becomes inactive, the code is transmitted once to indicate
that the fault became inactive. Inactive diagnostic codes are available
by request of PID 194. If more than 6 codes are active at any point,
PID 194 is sectioned as described in PID 192.
6-18
All information subject to change without notice.
(Rev. 01/07)
7SA827 0701
Copyright © 2007 DETROIT DIESEL CORPORATION
