J1939 CAN diagnostics connector supports twisted shielded pair as well as twisted unshielded wiring. 9-pin CAN diagnostics connector pin designations are shown below. All these topics are out of the scope of this article, please refer to the standard document for these details. This standard talks about more details of the connector mounting, serviceability, performance, environmental, physical requirements, and connector mechanical requirements. ![]() The off-board diagnostics connector specifications are defined in SAE J1939-13. Diagnostic Message 12 (DM12) Emission Related Active DTCs.Diagnostic Message 11 (DM11) Diagnostics Data Clear of Active DTCs.Diagnostic Message 4 (DM4) Freeze Frame Parameters.Diagnostic Message 3 (DM3) Diagnostics Data Clear of Previously Active DTCs.Diagnostic Message 2 (DM2) Previously Active Diagnostics Trouble Codes. ![]() Diagnostic Message 1 (DM1) Active Diagnostics Trouble Codes.
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