Pinpoint Test BG: PSCM (Power Steering Control Module) DTC (Diagnostic Trouble Code) C200B Steering Shaft Torque Sensor 1

Refer to POWER STEERING CONTROLS for schematic and connector information.

Normal Operation and Fault Conditions

Description

Description
The PSCM continually monitors the steering shaft torque sensor when the ignition is ON and the voltage supply to the sensor is between 5.26 and 4.71 volts.

Pinpoint Test Applicability

Pinpoint Test Applicability
This test applies to PSCMDTC C200B Steering Shaft Torque Sensor 1 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 verify PSCM C200B:XX is present and provide diagnostics if DTC C200B:XX is currently present and active in the PSCM.

Diagnostic Aids

Diagnostic Aids
During the ignition cycle the DTC initially sets, the PSCM either enters reduced assist mode or steering assist is gradually reduced until the PSCM enters manual mode.
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.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
PSCM C200B:49	Steering Shaft Torque Sensor 1: Internal Electronic Failure	If the PSCM does not receive information from the steering shaft torque sensor within a predetermined time frame, or if the information is faulty or outside of expected ranges. DTC C2B00:49 is set.
PSCM C200B:62	Steering Shaft Torque Sensor 1: Signal Compare Failure	If the steering shaft torque sensor signal does not match other sensor input, DTC C200B:62 is set.

Possible Sources

Visual Inspection and Pre-checks

This DTC sets when the steering torque sensor input to the PSCM is out of range or does not agree with other PSCM inputs. This is most likely due to internal faults in the PSCM. For additional fault setting information, refer to the PSCMDTC Chart.
Refer to Steering GSB for additional connector and wiring inspection tips