Pinpoint Test Am: PSCM (Power Steering Control Module) DTC (Diagnostic Trouble Code) U0146:00 Lost Communication With Serial Data Gateway "A"
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.
NOTE:
The serial data gateway module is also known as the GWM
NOTE:
Refer to Steering GSB for additional connector and wiring inspection tips.
Refer to Wiring Diagrams POWER STEERING CONTROLS for schematic and connector information.
Normal Operation and Fault Conditions
REFER to: Power Steering - System Operation and Component Description .
Description
- The PSCM monitors the HS-CAN messages when the voltage to the PSCM is greater than 10 volts and there are no Diagnostic Trouble Codes (DTCs) present inhibiting PSCM operation.
- For additional information on the messages sent to the PSCM from the GWM module, REFER to: Power Steering - System Operation and Component Description .
Pinpoint Test Applicability
- This test applies to PSCMDTC U0146 Lost Communication with serial data GWM only. It does not apply to any other module except the PSCM.
DTC Diagnostic Strategy
- If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs)) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).
Pinpoint Test Purpose
- To verify the PSCM wiring harness and connectors are OK. This test checks the connectors and wiring from the PSCM 3 pin connector at the steering gear to the in-line connector in the engine compartment. If these circuits are working correctly, the test then directs to check the GWM and wiring harness.
Diagnostic Aids
- Do not install a new PSCM as part of the repair for a PSCMDTC U146:00.
- DTC U0146:00 indicates a possible failure of the HS-CAN, the PSCM wiring harness or a GWM concern.
- The presence of DTC U0146:00 prevents the Evasive Steering Assist (ESA) feature from activating. If the DTC sets during an assist event, the event is terminated and the assist system is deactivated.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Condition |
|---|---|---|
| PSCM U0146:00 | Lost Communication With Serial Data Gateway "A": No Sub Type Information | This DTC sets when the PSCM does not receive the GWM module messages within a certain time frame. This can occur if the GWM module wiring harness or electrical connectors are loose or damaged, or if the vehicle battery state of charge levels are low. |
Possible Sources
- Fuse(s)
- Wiring, terminals or connectors
- Network communication concern
- GWM
Pinpoint Tests AM: PSCM DTC U0146 Lost Communication With The Serial Data Gateway "A"