Pinpoint Test BO: PSCM (Power Steering Control Module) DTC (Diagnostic Trouble Code) U2016 Control Module Main Software

Normal Operation and Fault Conditions 

• Description 
• When the battery voltage to the PSCM is greater than 10 volts with the ignition ON and there are no Diagnostic Trouble Codes (DTCs) present, the PSCM runs a self test of the system software. If an error is detected, a DTC is set and the EPAS enters into a limited operation mode.

• Pinpoint Test Applicability 
• This test applies to PSCMDTC U2016 Control Module Main Software 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 verifyPSCMDTC U2016:xx is present and provide diagnostics if DTC U2016:xx is currently active in the PSCM.

• Diagnostic Aids 
• During the ignition cycle the DTC U2016 initially sets, the PSCM either 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

  STEERING ASSIST FAULT SERVICE REQUIRED  in the message center.

• During the next ignition cycle after DTC U2016:47 sets, if the concern is still present, 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.

• When DTC U2016:47 is set, the PSCM remains in normal operation mode, but all steering features; Active Nibble Control, Pull-Drift Compensation, Evasive Steering Assist (ESA), Lane Departure Warning (LDW), Lane Keep Assist (LKA) and Lane Centering Assist (LCA) may be disabled.
• When DTC U2016:48 is set, the PSCM remains in normal operation mode, but all steering features: Active Nibble Control, Pull-Drift Compensation, Evasive Steering Assist (ESA), Lane Departure Warning (LDW), Lane Keep Assist (LKA) and Lane Centering Assist (LCA) may be disabled.

DTC Fault Trigger Conditions 

Possible Sources 

• PSCM internal failure

Visual Inspection and Pre-checks 

• This DTC sets when the PSCM internal self tests detect a software internal error. Consult the DTC Index for additional information if needed.

Pinpoint Tests BO: PSCM DTC U2016 Control Module Main Software