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

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

B1-B2:

B2-B3:

Normal Operation
The PCM communicates with the diagnostic tool through the controller area network (CAN), circuits 1827 (WH/LG) and 1828 (PK/LG). Check the CAN circuits 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 either an open in the CAN circuits, damage to the DLC C251, damage to the PCM C175b, or a problem in the in-line connector.

Possible Causes
- CAN data plus circuit 1827 (WH/LG) open
- CAN data minus circuit 1828 (PK/LG) open
- PCM C175b
- PCM