Pinpoint Test B: PSCM (Power Steering Control Module) DTC (Diagnostic Trouble Code) U3000 Control Module

Refer to Power Steering Controls for schematic and connector information.

Normal Operation and Fault Conditions

Description

The PSCM is self monitoring and performs self tests at specific intervals (initial power up, power down, during normal operation, ect.) Each self test requires the voltage supply to the PSCM to be at or above a specific level (above 6 volts, above 9 volts, between 10 and 17 volts, ect.) for the test to take place. If one or more of the self tests should fail, the module sets one or more Diagnostic Trouble Codes (DTCs).

Pinpoint Test Applicability

This test applies to PSCM DTC U3000:xx Diagnostic Trouble Codes (DTCs) except for U3000:4B. This test 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 PSCM U3000:XX is present and provide diagnostics if DTC U3000:XX is currently present and active in the PSCM.

Diagnostic Aids

For DTC U3000:42, steering assist is not affected and there is no warning in the message center. The PSCM may transmit an invalid steering angle message over the HS-CAN.
For DTC U3000:49, during the ignition cycle the DTC initially sets, the PSCM enters limp home mode and steering assist is gradually reduced until the PSCM enters manual mode. The PSCM sends a message to the IPC to display the
STEERING ASSIST FAULT SERVICE REQUIRED in the message center.
During the next ignition cycle after the DTC sets, If the PSCM is not already in manual mode the PSCM removes steering assist and enters manual mode. The module also transmits an invalid steering angle message over the HS-CAN and sends a message to the IPC to display the
STEERING ASSIST FAULT SERVICE REQUIRED in the message center.
The presence of DTC U3000:49 prevents 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 system is deactivated.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
PSCM U3000:05	Control Module: System Programming Failures	If an internal error is detected in the PSCM hardware, DTC U3000:05 is set.
PSCM U3000:42	Control Module: General Memory Failure	This DTC sets if the PSCM detects an internal memory data error during the data plausibility check.
PSCM U3000:49	Control Module: Internal Electronic Failure	If any time during normal operation with more than 10 volts supplied to the PSCM, the module detects a software or internal hardware error, DTC U3000:49 is set.
PSCM U3000:61	Control Module: Signal Calculation Failure	This DTC sets if the PSCM detects a steering sensor error during the data plausibility check.
PSCM U3000:66	Control Module: Signal Has Too Many Transitions/Events	If the PSCM detects the fault mitigation counter has exceeded a pre-set limit, DTC U3000:66 is set.

Possible Sources

Visual Inspection and Pre-checks

This DTC sets when the PSCM internal self tests detect a software or hardware internal error. This can be to internal faults in the PSCM or from water getting inside the PSCM. For additional fault setting information, refer to the PSCM DTC Chart. Refer to Diagnostic Trouble Code (DTC) Chart .