Pinpoint Test BD: PSCM (Power Steering Control Module) DTC (Diagnostic Trouble Code) U3001:68 Or U3001:89 Control Module Improper Shutdown Performance

NOTE: Refer to Steering GSB for additional connector and wiring inspection tips.

Refer to POWER STEERING CONTROLS for schematic and connector information.

Normal Operation and Fault Conditions

Description

Description
When the ignition is set to OFF, the PSCM remains powered up for a short period of time to store data in memory. When the ignition is set to ON, the PSCM retrieves this information and if the information is missing or corrupted a DTC is set.
REFER to: Power Steering - System Operation and Component Description

Pinpoint Test Applicability

Pinpoint Test Applicability
This test applies to PSCM DTC U3001 Control Module Improper Shutdown Performance only. It 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 verify PSCM DTC U3001 is present and investigate if the PSCM wiring is the reason for the momentary loss of power. This test verifies the PSCM fuses, PSCM wiring harness power and ground connections are working correctly, as well as the battery and charging system.

DTC Trigger

DTC Trigger
This DTC sets after the PSCM experiences a momentary loss of vehicle voltage. Prior to shutting down, the PSCM stores data in memory, when the ignition is set to ON, the PSCM reads this data and if it is missing or corrupted, this DTC sets. Therefore, the presence of DTC U3001 means the loss of vehicle voltage occurred prior to the DTC being set. Consult the DTC Index for additional information if needed.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
PSCM U3001:68	Control Module Improper Shutdown Performance: Event Information	This DTC indicates the PSCM lost power at a point in time causing an improper shutdown. Prior to shutting down, the PSCM stores data in memory, when the ignition is set to ON, the PSCM reads this information. If the information is missing or corrupted, DTC U3001:68 is set.

Possible Sources

Visual Inspection and Pre-checks

Make sure the vehicle battery terminals and cables are free of any corrosion and other contaminants.
Make sure the vehicle battery terminals are tightened to their correct torque specifications.
Make sure all PSCM fuses in the BJB and High-Current BJB are OK.

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.