J1939中诊断协议通讯方法
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2022-11-04
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J1939 Fault Codes
• J1939 has several different messages which contain diagnostic (fault) code
information.
– Diagnostic Message 1 - DM1 - Active Fault Codes
– Diagnostic Message 2 - DM2 - Inactive Fault Codes
– Diagnostic Message 3 - DM3 - Clear Inactive Fault Codes
• Typically customers will use the DM1 message to detect when a fault code has gone
active.
• The DM1 message is PGN 65226 or FECAh. Information about this message is in
J1939-73.
Breakdown of PGN 65226
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