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

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

P1-P3:

P3-P4:

P5-P6:

P6-P7:

P8-P9:

P9-P10:

P10-P11:

P12-P14:

P15-P19:

P20-P23:

P24-P27:

Normal Operation
The medium speed CAN has an unshielded twisted pair cable, circuits 2180 (WH/BK) and 2181 (BK/YE). The modules listed below 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 2180 (WH/BK) open, short to ground, or short to voltage
- medium speed CAN circuit 2181 (BK/YE) open, short to ground, or short to voltage
- DLC C251
- air suspension control module
- air suspension control module C2131b (Navigator) or C2324b (Expedition) (if equipped)
- climate controlled seat module
- climate controlled seat module C3265b
- driver seat module (DSM)
- DSM C341c
- electronic automatic temperature control (EATC) module
- EATC module C228b
- instrument cluster
- instrument cluster C220b
- parking aid module (if equipped)
- parking aid module C4226 (Expedition) or C4014b (Navigator)
- power liftgate module (if equipped)
- power liftgate module C4174d
- vehicle security module
- vehicle security module C2113c