Pinpoint Test Q: U0256:87
WARNING: This page is about a different car, the 2023 Lincoln Nautilus. However, it is still accessible from the selected car via links, so may be relevant.
- Refer to MODULE COMMUNICATIONS NETWORK
for schematic and connector information.
Normal Operation and Fault Conditions
DTC Fault Trigger Conditions
DTC Description Fault Trigger Condition BCM U0256:87 Lost Communication With Front Controls Interface Module "A": Missing Message A continuous memory DTC that sets in the BCM if messages from the FCIM through the GWM are missing. Possible Sources
- Communication network concern
- Battery voltage concern
- GWM concern
- FCIM
- BCM
- Q1 CHECK THE COMMUNICATION NETWORK
- Using a diagnostic scan tool, perform a network test.
Does the FCIM pass the network test?
Yes GO to Q2 No - Q2 CHECK THE BCM (BODY CONTROL MODULE) CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODES (CMDTCS)
- Using a diagnostic scan tool, clear the Diagnostic Trouble Codes (DTCs).
- Wait 10 seconds.
- Using a diagnostic scan tool, check the BCM Continuous Memory Diagnostic Trouble Codes (CM DTCs).
Is DTC U3006:16, U3006:17, U3007:16, U3007:17, U3013:16, U3013:17, U3014:16 or U3014:17 recorded?
Yes For DTC U3006:16, U3007:16, U3013:16 or U3014:16, GO to Pinpoint Test U
For DTC U3006:17, U3007:17, U3013:17 or U3014:17, GO to Pinpoint Test WNo GO to Q3 - Q3 RETRIEVE THE FCIM (FRONT CONTROLS INTERFACE MODULE) DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE SELF-TEST
- Using a diagnostic scan tool, perform the FCIM self-test.
Are any Diagnostic Trouble Codes (DTCs) recorded?
Yes REFER to: INFORMATION AND ENTERTAINMENT SYSTEM . No GO to Q4 - Q4 RECHECK THE BCM (BODY CONTROL MODULE) CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODES (CMDTCS)
- Using a diagnostic scan tool, clear the Diagnostic Trouble Codes (DTCs).
- Wait 10 seconds.
- Using a diagnostic scan tool, check the BCM Continuous Memory Diagnostic Trouble Codes (CM DTCs).
Is DTC U0256:87 still present?
Yes GO to Q5 No The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition. - Q5 CHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) U0256:87 SET IN OTHER MODULES
- Using a diagnostic scan tool, clear the Diagnostic Trouble Codes (DTCs).
- Ignition OFF.
- Ignition ON.
- Wait 10 seconds.
- Using a diagnostic scan tool, retrieve all
Continuous Memory Diagnostic Trouble Codes (CM DTCs).
Is DTC U0256:87 set in other modules?
Yes GO to Q6 No GO to Q7 - Q6 CHECK FOR CORRECT FCIM (FRONT CONTROLS INTERFACE MODULE) OPERATION
- Disconnect and inspect the FCIM connector.
- Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
- Reconnect the FCIM connector. Make sure it seats and latches correctly.
- Operate the system and determine if the concern is still present.
Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new FCIM. REFER to: Front Controls Interface Module (FCIM) . No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues. - Q7 CHECK FOR CORRECT BCM (BODY CONTROL MODULE) OPERATION
- Disconnect and inspect all BCM connectors.
- Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
- Reconnect the BCM connectors. Make sure they seat and latch correctly.
- Operate the system and determine if the concern is still present.
Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BCM. REFER to: Body Control Module (BCM) . No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.