Pinpoint Test C: Lost Communication With Pcm Concern
WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
Normal Operation and Fault Conditions
With the ignition ON, the PCM sends messages to the SECM through the GWM and the SASM over the HS-CAN2. The SASM and the SECM communicate over a private CAN. If the SECM does not receive these messages within a certain time frame, the SECM sets a DTC. For information on the messages sent to the by SECM the PCM, refer to the Network Message Chart .
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Condition |
|---|---|---|
| SECM U0100:00 | Lost Communication With ECM/PCM "A": No Sub Type Information | Sets when the SECM detects any of the PCM messages are missing. This can be due to a PCM failure, a circuit failure on the HS-CAN or an excessive load on the network. |
Possible Sources
- Network communication concern
- Charging system concern
- GWM
- SASM
- PCM
- SECM