Pinpoint Test H: Lost Communication With Suspect Module
- Refer to Four Wheel Drive Systems
for schematic and connector information.
Normal Operation and Fault Conditions
The TCCM communicates directly on the HS-CAN2 network with the ATCM, ABS module, and GWM. The TCCM communicates with the PCM, TCM, and BCM on the HS-CAN1 network via the GWM. The TCCM communicates with the IPC on the HS-CAN3 network via the GWM.
The TCCM sets a DTC for lost communication when it has not received messages from the suspect module for more than 5 seconds with ignition in RUN and battery voltage in range. Other modules that require data from the suspect module may also set a lost communication DTC if the fault is common to both receiving modules.
DTC Fault Trigger Conditions
DTC Description Fault Trigger Condition TCCM U0100:00 Lost Communication With ECM/PCM "A": No Sub Type Information Sets in continuous memory in the TCCM if powertrain data messages received from the PCM over the HS-CAN are missing for longer than 5 seconds with ignition in RUN and battery voltage in range. TCCM U0101:00 Lost Communication with TCM: No Sub Type Information Sets in continuous memory in the TCCM if powertrain data messages received from the TCM over the HS-CAN are missing for longer than 5 seconds with ignition in RUN and battery voltage in range. TCCM U0121:00 Lost Communication With Anti-Lock Brake System (ABS) Control Module "A": No Sub Type Information Sets in continuous memory in the TCCM if ABS module data messages received from the ABS module over the HS-CAN are missing for longer than 5 seconds. TCCM U0138:00 Lost Communication with All Terrain Control Module: No Sub Type Information Sets in continuous memory in the TCCM if data messages received from the Terrain Management module through the GWM are missing for 5 seconds or longer. TCCM U0140:00 Lost Communication With Body Control Module: No Sub Type Information Sets in continuous memory in the TCCM if data messages received from the BCM through the GWM are missing for 5 seconds or longer. TCCM U0155:00 Lost Communication With Instrument Panel Cluster (IPC) Control Module: No Sub Type Information Sets in continuous memory in the TCCM if IPC data messages received from the IPC through the GWM are missing for longer than 5 seconds. Possible Sources
- Communication concern
- Battery voltage concern
- Network fault
- Intermittent network traffic jam
- PCM, TCM, ABS, ATCM, BCM, IPC
- H1 L1 ATTEMPT TO DUPLICATE THE DTC (DIAGNOSTIC TROUBLE CODE)
- Using a diagnostic scan tool, perform the TCCM continuous memory self-test.
- Clear the DTC
- Ignition OFF.
- Open driver's door
- Close driver's door
- Wait 30 seconds
- Ignition ON.
- Wait 30 seconds
- Repeat the TCCM self-test.
Did the DTC reset in the TCCM
Yes GO to H2 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. - H2 CHECK FOR SUSPECT MODULE COMMUNICATION
- Using a diagnostic scan tool, perform the network test.
Did the suspect module PASS the network test?
Yes GO to H3 No The suspect module does not respond to the diagnostic scan tool. REFER to: Communications Network . - H3 CHECK THE SUSPECT MODULE FOR DTC (DIAGNOSTIC TROUBLE CODE)
- Using a diagnostic scan tool, perform the on demand self-test on the suspect module.
Are any DTCs recorded?
Yes DIAGNOSE and REPAIR all suspect module DTC. REFER to: Electronic Engine Controls 3.5L EcoBoost . REFER to: DTC Chart and Pinpoint Tests - 3.5L EcoBoost (272kW/370PS) . REFER to: Body Control Module (BCM) . REFER to: Four-Wheel Drive Systems - Vehicles With: 2-Speed Torque On Demand Transfer Case . REFER to: Anti-Lock Brake System (ABS) and Stability Control . REFER to: Instrumentation, Message Center and Warning Chimes . No GO to H4 - H4 CHECK FOR TCCM (TRANSFER CASE CONTROL MODULE) ON DEMAND DTC (DIAGNOSTIC TROUBLE CODE)
- Using a diagnostic scan tool, perform the TCCM on demand self-test.
Are any on demand DTCs recorded?
Yes DIAGNOSE and REPAIR all TCCM on demand DTC. REFER to: Four-Wheel Drive Systems - System Operation and Component Description . No The system is operating correctly at this time.