The CAN data link is used to communicate information between the Electronic Control Module (ECM) and other modules. Use this procedure to troubleshoot any suspect problems with the CAN data link.
This procedure covers the 247-09 J1939 Data Link communications.
This procedure identifies the following problems:
- Faulty connectors
- Missing termination resistors
- Short circuits
- Open circuits
- Faulty J1939 display
Illustration 1 g01119843
Schematic for the CAN data link
Illustration 2 g01167488
Engine view (typical example)
(1) J1/P1 ECM connectors
Illustration 3 g01149983
Engine view (typical example)
(2) J61 customer connector
(3) J63 service tool connector
Illustration 4 g01215698
P1 terminals that are associated with the CAN data link
(P1-34) CAN data link −
(P1-42) CAN shield
(P1-50) CAN data link +
Illustration 5 g01123351
J61/P61 terminals that are associated with the CAN data link
(16) CAN shield
(17) CAN data link +
(18) CAN data link −