Sae J1939-73 Pdf Link

Used by a scan tool to request specific DTC lists from a specific ECU address.

SPN 520000+ used to be “reserved” but now refer to aftertreatment and telematics modules. Your PDF must include the 520000–524287 range. Sae J1939-73 Pdf

Captures engine conditions (RPM, coolant temp, throttle position) at the moment a DTC was triggered. Used by a scan tool to request specific