What does the second number in a SAE fault code indicate?

The second number in a SAE fault code provides specific information regarding the type of circuit failure. This coding system is designed to help technicians quickly and easily identify issues in a vehicle's systems. For instance, in a standard SAE code format, the first number typically signifies the system or component area (like engine or transmission), while the second number classifies the nature of the failure, such as a short circuit, open circuit, or failure in a particular component. Understanding this aspect of fault codes is essential for efficient troubleshooting and repair in truck and coach maintenance.