Test F: No Medium Speed Controller Area Network (CAN) Communication
PINPOINT TEST F: NO MEDIUM SPEED CONTROLLER AREA NETWORK (CAN) COMMUNICATIONF1-F2:
F3-F4:
F5-F8:
F9-F11:
Normal Operation
The medium speed CAN has an unshielded twisted pair cable, circuits 1827 (WH/LG) and 1828 (PK/LG). The smart junction box (SJB), instrument cluster and electronic automatic temperature control (EATC) module all communicate with the diagnostic tool using the medium speed CAN. The total resistance values from the data link connector (DLC) C251 to an individual module 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 DLC C251, damage to one of the communications network module connectors, or damage to an in-line connector.
Possible Causes
- medium speed CAN circuit 1827 (WH/LG) open, short to ground, or short to voltage
- medium speed CAN circuit 1828 (PK/LG) open, short to ground, or short to voltage
- DLC C251
- SJB
- SJB C2280e
- EATC module
- EATC module C228
- instrument cluster
- instrument cluster C220