Test D: The Powertrain Control Module (PCM) Does Not Respond to the Diagnostic Tool

PINPOINT TEST D: THE POWERTRAIN CONTROL MODULE (PCM) DOES NOT RESPOND TO THE DIAGNOSTIC TOOL

D1-D2:

D2-D3:

Normal Operation
The PCM communicates with the diagnostic tool through the high speed controller area network (CAN), circuits 1814 (WH/LB) and 1815 (PK/LB). Check the high speed CAN circuits 1814 (WH/LB) and 1815 (PK/LB) between the PCM C175b and the data link connector (DLC) C251. The total 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 CAN circuits, damage to the DLC C251, damage to the PCM C175b, or a problem in an in-line connector.

Possible Causes
- high speed CAN circuit 1814 (WH/LB) open
- high speed CAN circuit 1815 (PK/LB) open
- PCM
- PCM C175b