Pinpoint Test At: PSCM (Power Steering Control Module) DTC (Diagnostic Trouble Code) U0415 Invalid Data Received From Anti-Lock Brake System (Abs) Control Module "A"

Normal Operation and Fault Conditions

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 ABS module, REFER to: Power Steering - System Operation and Component Description .

Pinpoint Test Applicability
This test applies to PSCM DTC U0415 Invalid Data Received from ABS Control Module "A" 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 direct the diagnosis to the module and associated circuit sending the faulty or unknown information in the messages.

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.
DTC U0415:00 or U0415:22 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 PSCM DTC U0415:00 or U0415:22.
The presence of DTC U0415:00 or U0415:22 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