SAE J1939-73 does not use standard OBD-II codes (like P0300). Instead, it structures faults using four primary components that pinpoint the exact electronic failure.
Complete Guide to SAE J1939-73: The Backbone of Heavy-Duty Vehicle Diagnostics Sae J1939-73 Pdf
: Supports regulatory On-Board Diagnostics (OBD) requirements set by authorities like the EPA and EU. Core Diagnostic Messages (DMs) SAE J1939-73 does not use standard OBD-II codes (like P0300)
The J1939-73 standard specifies:
Within these Diagnostic Messages, the standard uses two primary identifiers to describe a problem: Suspect Parameter Number (SPN): Can’t copy the link right now
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The SAE J1939-73 standard offers several key features that make it an essential component of vehicle networks: