Pinpoint Test G : Lost Communication With Another Module
WARNING: This page is about a different car, the 2020 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
- Refer to TWO WHEEL DRIVE/FOUR WHEEL DRIVE SYSTEMS
for schematic and connector information. Refer to MODULE COMMUNICATIONS NETWORK
for schematic and connector information.
Normal Operation and Fault Conditions
The TCCM expects to receive network data from other modules on HS-CAN2. The TCCM will set a DTC when it has not received messages from a module for more than 5 seconds. Other modules that require data from the suspect module may also set lost communication DTC.
The ATCM expects to receive network data from other modules on HS-CAN2. The ATCM will set a DTC when it has not received messages from a module for more than 5 seconds. Other modules that require data from the suspect module may also set lost communication DTC.
DTC Fault Trigger Conditions
DTC Description Fault Trigger Condition ATCM U0102:00 Lost Communication with Transfer Case Control Module: No Sub Type Information The ATCM has not received messages from the suspect module for more than 5 seconds. ATCM U0140:00 Lost Communication With Body Control Module: No Sub Type Information The ATCM has not received messages from the suspect module for more than 5 seconds. TCCM U0100:00 Lost Communication With ECM/PCM "A": No Sub Type Information The TCCM has not received messages from the suspect module for more than 5 seconds. TCCM U0101:00 Lost Communication with TCM: No Sub Type Information The TCCM has not received messages from the suspect module for more than 5 seconds. TCCM U0121:00 Lost Communication With Anti-Lock Brake System (ABS) Control Module "A": No Sub Type Information The TCCM has not received messages from the suspect module for more than 5 seconds. TCCM U0138:00 Lost Communication with All Terrain Control Module: No Sub Type Information The TCCM has not received messages from the suspect module for more than 5 seconds. TCCM U0140:00 Lost Communication With Body Control Module: No Sub Type Information The TCCM has not received messages from the suspect module for more than 5 seconds. TCCM U0155:00 Lost Communication With Instrument Panel Cluster (IPC) Control Module: No Sub Type Information The TCCM has not received messages from the suspect module for more than 5 seconds. Possible Sources
- Suspect module
- Vehicle level voltage concern
- HS-CAN2
- G1 CHECK FOR LOST COMMUNICATION DTC (DIAGNOSTIC TROUBLE CODE) IN OTHER MODULES
- Enter the following diagnostic mode: Retrieve all CM DTC.
Do any other modules on the vehicle also have a Lost Communication DTC with the suspect module?
Yes REFER to: Communications Network . No GO to G2 - G2 REVIEW CM DTC (CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODE) FOR LOW VOLTAGE DTC (DIAGNOSTIC TROUBLE CODE)
- Review all module CM DTC for low voltage DTC
Do any modules have a low voltage DTC set?
Yes Resolve all vehicle voltage concerns. REFER to: Charging System - 2.7L EcoBoost (238kW/324PS)/3.5L EcoBoost (272kW/370PS) . No GO to G3 - G3 INSPECT HS-CAN2 (HIGH-SPEED CONTROLLER AREA NETWORK 2) CONNECTORS
- Refer to MODULE COMMUNICATIONS NETWORK for schematic and connector information. DISCONNECT and INSPECT the HS-CAN2 connectors between the TCCM or ATCM and the suspect module
- 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
- Connect all connectors. Make sure each connector seats and latches correctly.
- Operate the system and verify the concern is still present.
Is the concern still present?
Yes CHECK OASIS for any applicable TSB. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSB address this concern, INSTALL a new suspect module. For U0100, Refer to PCM Guided Routine Testing . For U0101, REFER to: Transmission Control Module (TCM) . For U0121, Refer to ABS GUIDED ROUTINE . For U0138, REFER to: Mode Select Switch (MSS) - Raptor . For U0140, Refer to BCM Guided Routine . For U0155, Refer to IPC Guided Routine Testing . 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.