Pinpoint Test Aw: PSCM (Power Steering Control Module) DTC (Diagnostic Trouble Code) U045A:00

Refer to POWER STEERING CONTROLS for schematic and connector information.

Normal Operation and Fault Conditions

Description

Description
The PSCM monitors the HS-CAN 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 U045A Invalid Data Received from the PAM 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
For additional information on the messages sent to the PSCM from the PAM module, refer to Network Message Chart in the service information.
DTC U045A:00 indicates a concern with the lane information sent from the PAM. The module reporting this DTC is not the problem module. Do not install a new PSCM as part of the repair for PSCMDTC U045A:00.
The presence of DTC U045A:00 may prevent the active park assist from activating. If the DTC sets during an assist event, the event may be terminated and the assist feature may be deactivated.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
PSCM U045A:00	Invalid Data Received From Parking Assist Control Module 'A': No Sub Type Information	This DTC is set if the PSCM receives an "fault" or "unknown" message from the PAM instead of valid information.

Possible Sources