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Home >> Lincoln >> 2018 >> MKZ Select, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1150 (Information Center - Instrumentation, Message Center And Warning Chimes) >> Diagnosis And Testing >> Instrumentation, Message Center and Warning Chimes >> Pinpoint Tests >> Pinpoint Test BQ : U0256:00, U0557:80, U0557:81 Or U0557:82 >> Notes

Pinpoint Test BQ : U0256:00, U0557:80, U0557:81 Or U0557:82: Notes

WARNING: This page is about a different car, the 2018 Lincoln MKC. However, it is still accessible from the selected car via links, so may be relevant.

Normal Operation and Fault Conditions 

IPC DTC Fault Trigger Conditions 

DTC Description Fault Trigger Conditions
U0256:00 Lost Communication With Front Controls Interface Module "A": No Sub Type Information Sets in continuous memory in the IPC if data messages received from the FCIM through the GWM are missing for 5 seconds or longer.
U0557:80 Invalid Data Received From Front Controls Interface Module "A": ISO/SAE Reserved Sets in continuous memory in the IPC if invalid data messages received from the FCIM are missing for 5 seconds or longer.
U0557:81 Invalid Data Received From Front Controls Interface Module "A": Invalid Serial Data Received Sets in continuous memory in the IPC if invalid serial data messages received from the FCIM are missing for 5 seconds or longer.
U0557:82 Invalid Data Received From Front Controls Interface Module "A": Alive/Sequence Counter Incorrect/Not Updated Sets in continuous memory in the IPC if updated data messages received from the FCIM are missing for 5 seconds or longer.

Possible Sources 

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