Pinpoint Test Aw: SASM (Steering Angle Sensor Module) Communication Concern With The Pcm (Powertrain Control Module)
Refer to Vehicle Dynamic Systems for schematic and connector information.
Normal Operation and Fault Conditions
REFER to: Anti-Lock Brake System (ABS) and Stability Control - System Operation and Component Description .
With the ignition ON, the PCM sends messages to the GWM over the FD-CAN, the GWM relays the messages to the SASM over the HS-CAN2. If the SASM does not receive these messages within a certain time frame, the module sets Diagnostic Trouble Codes (DTCs). This can be due to a PCM failure, a circuit failure on the CAN network or an excessive load on the network.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Condition |
|---|---|---|
| SASM U0100:00 | Lost Communication With ECM/PCM 'A': No Sub Type Information | Sets if the SASM detects any of the PCM messages are missing. |
| SASM U0401:00 | Invalid Data Received from ECM/PCM A: No Sub Type Information | Sets if the SASM receives invalid data in the gear lever position message or the power pack status message. |
| SASM U0401:81 | Invalid Data Received from ECM/PCM A: Invalid Serial Data Received | Sets if the SASM receives invalid data in the vehicle speed quality factor check message. |
| SASM U0401:82 | Invalid Data Received from ECM/PCM A: Alive/Sequence Counter Incorrect/Not Updated | Sets if the SASM receives invalid data in the vehicle speed counter check message. |
| SASM U0401:83 | Invalid Data Received from ECM/PCM A: Value Of Signal Protection Calculation Incorrect | Sets if the SASM receives invalid data in the vehicle speed checksum check message. |
Possible Sources
- Wiring, terminals or connectors
- Network communication concern
- PCM
- SASM