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Understanding SAE J1939.73: A Comprehensive Guide

What is SAE J1939.73?

• DM1: Active Diagnostic Trouble Codes.
• DM2: Previously Active Diagnostic Trouble Codes.
• DM3: Diagnostic Data Clear/Reset.
• DM11: Diagnostic Data Clear (for active codes).

Status Reporting

: Standardizes "lamp" signals (e.g., Check Engine, Stop Engine) to communicate vehicle health to the driver.

Feature Name

Licensing:

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3. OBD Compliance for Off-Highway Engines

Memory Access:

Provides protocols for reading and writing to the ECU (Electronic Control Unit). DM1: Active Diagnostic Trouble Codes