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Pinpoint Test A : U0100:00, U0100:87: Notes

Normal Operation and Fault Conditions 

REFER to: Communications Network - System Operation and Component Description

DTC Fault Trigger Conditions 

DTC Description Fault Trigger Conditions
U0100:00 Lost Communication With ECM/PCM "A": No Sub Type Information Sets in the BCM if powertrain data messages received from the PCM over the HS-CAN are missing.
U0100:87 Lost Communication With ECM/PCM "A": Missing Message A continuous memory DTC that sets in the BCM if powertrain data messages received from the PCM over the HS-CAN are missing.

Possible Sources 

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