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Normal Operation and Fault Conditions

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With the ignition ON, the GWM sends messages to the SASM over the HS-CAN 2. If the SASM does not receive these messages within a certain time frame (usually less than 1 second), the SASM sets DTCs. 

PPT BA SASM DTC FAULT TRIGGER CONDITIONS

DTC Description Fault Trigger Conditions
U0146:00 Lost Communication With Gateway "A": No Sub Type Information Sets in continuous memory and on-demand when the SASM detects any of the GWM messages are missing. This can be due to a GWM failure, a circuit failure on the HS-CAN or an excessive load on the network.
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