In a vehicle using CAN communication, which pins should be checked for proper signal operation if an OBD communication error is present?

In a vehicle utilizing Controller Area Network (CAN) communication, the correct pins to check for proper signal operation in the event of an OBD communication error are pins 6 and 14. These specific pins are designated for the CAN High and CAN Low signals, respectively.

The CAN bus system relies on differential signaling between these two pins to communicate error messages and operational data between the vehicle's various electronic control units (ECUs). If there's an issue with the signals on these pins, it could lead to communication errors, which are often at the root of OBD-related issues. Monitoring these pins can help identify whether there is a fault in the communication process, such as wiring issues, a bad connection, or malfunctioning ECUs that could be disrupting the data flow essential for diagnosing vehicle performance and emissions controls.

It is important to understand the role of the other pins cited in the incorrect choices. For instance, pins 1 and 9 are associated with different diagnostic functions and do not directly pertain to the CAN bus. Similarly, the other pin combinations mentioned focus on different communication protocols or power supply functions that won't directly address the CAN communication errors experienced in OBD systems. Thus, focusing on pins 6 and 14 is essential when troubleshooting CAN