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-D3:

Normal Operation
The PCM communicates with the diagnostic tool through the high speed controller area network (CAN), circuits 1847 (WH/OG) and 1848 (PK/OG). Check the high speed CAN, circuits 1847 (WH/OG) and 1848 (PK/OG), between the PCM C175 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 C175, or a problem in an in-line connector.

Possible Causes
- high speed CAN circuit 1847 (WH/OG) open
- high speed CAN circuit 1848 (PK/OG) open
- PCM
- PCM C175