Saturn Saturn ASTRA Specifications download pdf (Page 10)

Chassis Specialist : Electric Power Steering

Page 7

STEERING POSITION SENSOR SIGNAL 1

STEERING WHEEL POSITION SENSOR SIGNAL 2

Steering Wheel Position Sensor Signals

Power Steering Control Module (PSCM)

The power steering control module (PSCM) is the brain of the system. By using inputs from the torque

sensor and/or position sensor, battery voltage, engine speed as well as a vehicle speed signal from the

engine control module (ECM) or body control module (BCM), the PSCM is able to provide the correct

level of assist by commanding the EPS motor. The PSCM will be able to tailor the assist based on

steering input and vehicle speed. The assist is greater at lower speeds and is reduced as the vehicle

speed increases. The PSCM also provides thermal protection for the EPS motor. The PSCM will reduce

the current to the EPS motor to prevent damage from excessive current such as when the steering wheel

is held on the steering stops during a parking manoeuvre. The PSCM will also illuminate a service

steering system light or message whenever a system fault has been detected. The PSCM is wired to the

vehicle’s Controller area network (CAN).

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Saturn Saturn ASTRA Specifications Page 10