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COMMUNICATION PROTOCOLS
DM1 – Active Diagnostic Trouble Codes
Transmission /
Reception Rate:
Whenever a DTC becomes an active fault and at a normal update rate
of one second or longer, and then becomes inactive, a DM1 message
will be transmitted to re
fl
ect this state change. If a different DTC
changes state within one second update period, a new DM1 message is
transmitted to re
fl
ect this new DTC.
Data Length:
Variable
Data Page:
0
PDU Format:
254
PDU Speci
fi
c:
202
Default Priority:
6
PGN:
65226 (0x00FECA)
Byte: 1
Bits: 8–7
Malfunction Indicator Lamp Status (SPN 1213)
00: Lamp Off
01: Lamp On
10: Error
11: Not Available
Bits: 6–5
Red Stop Lamp Status (SPN 623)
00: Lamp Off
01: Lamp On
10: Error
11: Not Available
Bits: 4–3
Amber Warning Lamp Status (SPN 624)
00: Lamp Off
01: Lamp On
10: Error
11: Not Available
Bits: 2–1
Protect Lamp Status (SPN 987) – N/A
Byte: 2
Bits: 8–1
Reserved for SAE assignment Lamp Status
Byte: 3
Bits: 8–1
SPN, 8 least signi
fi
cant bits of SPN (SPN 1214)
(most signi
fi
cant at bit 8)
Byte: 4
Bits: 8–1
SPN, second byte of SPN
(most signi
fi
cant at bit 8)
Byte: 5
Bits: 8–6
SPN, 3 most signi
fi
cant bits
(most signi
fi
cant at bit 8)
Bits: 5–1
FMI (SPN 1215)
(most signi
fi
cant at bit 5)
Byte: 6
Bit: 8
Bits: 7–1
SPN Conversion Method (SPN 1706)
Occurrence Count (SPN 1216)
6-38
All information subject to change without notice.
(Rev. 01/07)
7SA827 0701
Copyright © 2007 DETROIT DIESEL CORPORATION