Test A: The Powertrain Control Module (PCM) Does Not Respond To The Diagnostic Tool
PINPOINT TEST A: THE POWERTRAIN CONTROL MODULE (PCM) DOES NOT RESPOND TO THE DIAGNOSTIC TOOLA1:
A1 Continued:
A2:
Normal Operation
The PCM communicates with the diagnostic tool through the controller area network (CAN), circuits 1827 (WH/LG) and 1828 (PK/LG). Check circuits 1827 (WH/LG) and 1828 (PK/LG) between the PCM C175a (gasoline) or C176a (diesel) 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 C175a (gasoline) or C176a (diesel), or a problem in an in-line connector.
Possible Causes
- CAN circuit 1827 (WH/LG) open
- CAN circuit 1828 (PK/LG) open
- PCM