MID 128, SID 250 SAE J1708/J1587
FMI 12 – Faulty device or component
Fault code explanation: Communication fault J1587/J1708
Fault indication: DCU: Engine warning in DCU display.
CIU: Flash code
Electrical fault: 9.2
Value fault: None.
Conditions for fault code: Faulty data link.
Suitable action: 1 Check all data links between DCU/CIU and EMS2.
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.
A CAN H – Data Link to Engine
B CAN L – Data Link to Engine
C Power supply, 0 V
D Power supply, input
G J1708A – Data Link to Engine
H J1708B – Data Link to Engine
a Engine connector
30-2 Fault Tracing
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