Pinpoint Test At: PSCM (Power Steering Control Module) DTC (Diagnostic Trouble Code) U0415:00

Refer to POWER STEERING CONTROLS for schematic and connector information.

Normal Operation and Fault Conditions

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

Pinpoint Test Applicability
This test applies to PSCMDTC U0415 Invalid Data Received from ABS Control Module "A" only. It does not apply to any other module except the PSCM.

DTC Diagnostic Strategy

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

Pinpoint Test Purpose
To direct the diagnosis to the module and associated circuit sending the faulty or unknown information in the messages.

Diagnostic Aids

Diagnostic Aids
Steering assist may be reduced if the vehicle speed signal is missing. The module may transmit an invalid steering angle message over HS-CAN if the angle offset from ABS module is missing.
For additional information on the messages sent to the PSCM from the ABS module, refer to Network Message Chart of the service information.
DTC U0415:00 indicates a concern with the ABS. The module reporting this DTC is not the problem module. Do not install a new PSCM as part of the repair for PSCMDTC U0415:00.
The presence of DTC U0415:00 may prevent the optional steering features; active park assist, Lane Keeping Assist (LKA) and Lane Centering Assist (LCA) from activating. If the DTC sets during an assist event, the event is terminated and the assist feature is deactivated.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
PSCM U0415:00	Invalid Data Received from Anti-Lock Brake System (ABS) Control Module 'A': No Sub Type Information	This DTC is set if the PSCM receives an "fault" or "unknown" message from the ABS module instead of valid sensor information.
PSCM U0415:22	Invalid Data Received from Anti-Lock Brake System (ABS) Control Module 'A': Signal Amplitude Greater Than Maximum	This DTC is set if the PSCM receives an "fault" or "unknown" message from the ABS module instead of valid sensor information.

Possible Sources

Visual Inspection and Pre-checks

This DTC sets when the PSCM does not receive the ABS module messages within a certain time frame. This can occur if the ABS 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.