Power Steering System: Specifications Saturn VUE I

Fastener Tightening Specifications

Fastener Tightening Specifications

Power Steering Control Module (PSCM) C1 (Part of the Steering Column) Terminal Identification Connector Part Information 7123-4123-30 2-Way F (BK) Pin Wire Color Circuit No. Function 1(+) RD 8040 Battery Positive Voltage 2(-) BK 350 Ground

Power Steering Control Module (PSCM) C2 (Part of the Steering Column) Terminal Identification Connector Part Information 776195-6 6-Way F (GY) Pin Wire Color Circuit No. Function 1-3 - - Not Used 4 PU 1807 Class 2 Serial Data 5 PU 1807 Class 2 Serial Data 6 PK 739 Ignition 1 Voltage

Power Steering Control Module (PSCM) C3 (Part of the Steering Column) Terminal Identification Connector Part Information 7123-4123-30 2-Way F (BK) Pin Wire Color Circuit No. Function 1(+) RD 5 Left Assist Motor Control 2(-) BK 5 Right Assist Motor Control

Scheme 1

1. Perform the «Diagnostic System Check - Power Steering System»(ref-188802-S10156688922005090200000) before using the Symptom Tables in order to verify that all of the following are true: There are no DTCs set. The control module can communicate via the serial data link. The EPS assembly has not been damaged from a collision, or air bag deployment.
2. Review the system operation in order to familiarize yourself with the system functions. Refer to «Power Steering System Description and Operation»(ref-188802-S01674623202005090200000).

Torque Sensor

The PSCM uses a torque sensor as it's main input for determining the amount of steering assists. The steering column has an input shaft, from the steering wheel to the torque sensor, and an output shaft, from the torque sensor to the steering shaft coupler. The input and output shafts are separated by a torsion bar, where the torque sensor is located. The sensor consists of a compensation coil, detecting coil, and 3 detecting rings. These detecting rings have toothed edges that face each other. Detecting ring 1 is fixed to the output shaft, detecting rings 2 and 3 are fixed to the input shaft. The detecting coil is positioned around the toothed edges of detecting rings 1 and 2. As torque is applied to the steering column shaft the alignment of the teeth between detecting rings 1 and 2 changes, which causes the detecting coil signal voltage to change. The PSCM recognizes this change in signal voltage as steering column shaft torque. The compensation coil is used to compensate for changes in electrical circuit impedance due to circuit temperature changes from electrical current and voltage levels as well as ambient temperatures for accurate torque detection.

See also:
• Service Programming System (SPS)