Pinpoint Test Ai: Abs Module Communication Concern With Pcm
WARNING: This page is about a different car, the 2023 Lincoln Navigator. 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 ABS module over the FD-CAN. If the ABS module does not receive these messages within the allotted time frame or if the messages contain invalid data, the module sets a DTC. This can be due to a PCM failure, a circuit failure on the network or an excessive load on the network. For information on the messages sent to the ABS module by the PCM, REFER to: Anti-Lock Brake System (ABS) and Stability Control - System Operation and Component Description .
The TCM is an internal component of the PCM.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Condition |
|---|---|---|
| ABS U0100:00 | Lost Communication With ECM/PCM 'A': No Sub Type Information | This DTC sets when the ABS module does not receive any messages from the PCM within the allowed time. |
| ABS U0401:00 | Invalid Data Received from ECM/PCM A: No Sub Type Information | This DTC sets when the ABS module receives invalid data in any of the following messages: powertrain message counter, powertrain message checksum, gear lever position or REVERSE gear status. |
| ABS U0401:64 | Invalid Data Received from ECM/PCM A: Signal Plausibility Failure | This DTC sets when the ABS module receives invalid data in the driven wheel torque messages. |
| ABS U0401:86 | Invalid Data Received from ECM/PCM A: Signal Invalid | This DTC sets when the ABS module receives invalid data in the accelerator pedal message, driven wheel torque message, transmission requested gear message or PARK status message. |
| ABS U0402:86 | Invalid Data Received from TCM: Signal Invalid | This DTC sets when the ABS module receives invalid data in the neutral tow command or the selectable drive mode switch type message. |
Possible Sources
- Network communication concern
- PCM