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

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

O1-O3:

O3-O4:

O4-O5:

O6-O7:

O8-O11:

O12-O14:

O15:

Normal Operation
The high speed CAN has an unshielded twisted pair cable, circuits 1814 (WH/LB) and 1815 (PK/LB). The powertrain control module (PCM), instrument cluster, the anti-lock brake system (ABS) module, and the transmission control module (TCM) are all on the high speed CAN. The total resistance values from the data link connector (DLC) C251 must not be more than 5 ohms. If the resistance is more than 5 ohms there is an open in one of the 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
- high speed CAN circuit 1814 (WH/LB) open, short to ground, or short to voltage
- high speed CAN circuit 1815 (PK/LB) open, short to ground, or short to voltage
- DLC C251
- PCM
- PCM C175b
- instrument cluster
- instrument cluster C220b
- ABS module
- ABS module C135
- TCM
- TCM C1473 (if equipped)