Pinpoint Test G : U0100:87: Notes
WARNING: This page is about a different car, the 2015 Ford F-150. 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
With the ignition ON, the PCM sends messages to the GWM over the HS-CAN1, the GWM relays these message to the EPB module over the HS-CAN2. If the EPB module does not receive these messages within the specified time frame, the EPB module sets Diagnostic Trouble Codes (DTCs). This can be due to a PCM failure, a GWM failure, a circuit failure on the network or an excessive load on the network. For information on the messages sent to the EPB module by the PCM, REFER to: Parking Brake - System Operation and Component Description .
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| U0100:87 | Lost Communication With ECM/PCM "A": Missing Message | This DTC sets in continuous memory if the EPB module does not receive any messages from the PCM. |
Possible Causes
- Wiring, terminals or connectors
- Network communication concern
- GWM
- PCM
- EPB module