Pinpoint Test D: 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

Description
The PSCM is self monitoring and performs self tests at specific intervals (initial power up, power down, during normal operation, etc.) 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 DTC.

Pinpoint Test Applicability

Pinpoint Test Applicability
This test applies to PSCMDTC U3000:xx DTC except for U3000:4B. This test 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 DTC, 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 DTC are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active DTC before diagnosing any historic DTC.

Pinpoint Test Purpose

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

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 Keeoing 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 U3000:42	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.

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 Diagnostic Trouble Code (DTC) Chart

COMPLETE THE FDRS GUIDED ROUTINE
1. NOTE: This procedure must be completed using FDRS. Do not clear DTCs until the FDRS procedure has completed. To complete the diagnosis, navigate to the FDRS Guided Routine tab and carry out the procedure
  Electronic Power Assist Steering (EPAS) Internal Failure
.