Pinpoint Test H : Lost Communication With Suspect Module: Notes
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 IPCdata 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