MID 128, SID 250 SAE J1708/J1587
data link
FMI 12 – Faulty device or component
Fault code explanation: Communication fault J1587/J1708
Fault indication: DCU: Engine warning in DCU display.
CIU: Flash code
Flash code
Electrical fault: 9.2
Value fault: None.
Symptom: None.
Conditions for fault code: Faulty data link.
Suitable action: 1 Check all data links between DCU/CIU and EMS2.
2 Check
the
contact pressure in socket 33 and 34 in engine connector A.
3 Check that the socket 22 and 37 in the CIU connector is undamaged.
Circuit description
A CAN H – Data Link to Engine
B CAN L – Data Link to Engine
C Power supply, 0 V
D Power supply, input
E Ignition
F Stop
G J1708A – Data Link to Engine
H J1708B – Data Link to Engine
Y/W 1
GR/Y 2
SB 3
R 4
R/BL 5
GR/SB 6
W 7
W/SB 8
EMS2
DCU/CIU
A
E
B
C
D
A
F
G
H
a
P0013534
a Engine connector
30-2 Fault Tracing
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