Test G: No Medium Speed Controller Area Network (CAN) Communication

PINPOINT TEST G: NO MEDIUM SPEED CONTROLLER AREA NETWORK (CAN) COMMUNICATION

G1:

G1-G3:

G3-G4:

G5-G7:

G8-G9:

Normal Operation
The medium speed CAN has an unshielded twisted pair cable, circuits 1847 (WH/OG) and 1848 (PK/OG). The smart junction box (SJB) and the instrument cluster are the only modules on the medium speed CAN. Total network resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open in one of the medium speed CAN circuits, damage to the data link connector (DLC) C251, damage to one of the network module connectors, or damage to an in-line connector. Since both the SJB and the instrument cluster share network termination responsibilities, a problem in either of these modules can result in a medium speed CAN failure.

Possible Causes
- medium speed CAN circuits 1847 (WH/OG) and 1848 (PK/OG) shorted to ground or open
- SJB power circuit 1052 (TN/BK) open
- SJB ground circuit 570 (BK/WH) open
- DLC C251
- SJB
- instrument cluster
- battery junction box (BJB) fuse 19 (40A)