Test H: No High Speed Controller Area Network (CAN) Communication

PINPOINT TEST H: NO HIGH SPEED CONTROLLER AREA NETWORK (CAN) COMMUNICATION

H1-H2:

H2-H5:

H6-H8:

H8-H10:

H11-H14:

Normal Operation
The high speed CAN has an unshielded twisted pair cable, circuits 1908 (WH) and 1909 (BK). The powertrain control module (PCM), anti-lock brake system (ABS) module, four-wheel drive (4WD) control module, and the instrument cluster are all on the high 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 high 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 PCM and the instrument cluster share network termination responsibilities, a problem in either of these modules can result in a high speed CAN failure.

Possible Causes
- high speed CAN circuits 1908 (WH) and 1909 (BK) shorted to ground or open
- PCM
- instrument cluster
- ABS module
- 4WD control module