Pinpoint Test Am: PSCM (Power Steering Control Module) DTC (Diagnostic Trouble Code) U0146:00
WARNING: This page is about a different car, the 2021 Ford Escape. 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
Refer to 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.
Pinpoint Test Applicability
- This test applies to PSCM DTC 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 column to the in-line connector in the passenger compartment. If these circuits are working correctly, the test then directs to check the GWM and wiring harness.
Diagnostic Aids
- For additional information on the messages sent to the PSCM from the GWM module, refer to the Network Message List in Network Message Chart .
- Do not install a new PSCM as part of the repair for a PSCM DTC U146:00.
- 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 communications between the PSCM and the GWM fails. DTC U0146:00 can also set due to a circuit failure on the HS-CAN, the PSCM wiring harness or a GWM concern. |
Possible Sources
- Fuse(s)
- Wiring, terminals or connectors
- Network communication concern
- GWM
Visual Inspection and Pre-checks
- 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. Consult the DTC Index for additional information if needed.
- Refer to Steering GSB for additional connector and wiring inspection tips.
Pinpoint Tests AM: PSCM DTC U0146 Lost Communication With The Serial Data Gateway "A"