Neon R/T Power Steering Pressure Switch Specifications
Power Steering Pressure Switch: Description and Operation
POWER STEERING PRESSURE SWITCH DESCRIPTION
A power steering pressure switch is used to improve the vehicle's idle quality. The pressure switch improves vehicle idle quality by causing a
readjustment of the engine idle speed as necessary when increased fluid pressure is sensed in the power steering system.
The pressure switch functions by signaling the powertrain control module that an increase in pressure of the power steering system is putting
additional load on the engine. This type of condition exists when the front tires of the vehicle are turned while the vehicle is stationary and the engine
is at idle speed. When the powertrain control module receives the signal from the power steering pressure switch, it directs the engine to increase its
idle speed. This increase in engine idle speed compensates for the additional load, thus maintaining the required engine idle speed and idle quality.
The power steering pressure switch is mounted directly to the power steering gear.
OPERATION
The switch provides an input to the PCM during periods of high pump load and low engine RPM; such as during parking maneuvers.
When power steering pump pressure exceeds 2758 kPa (400 psi), the switch is open. The PCM increases idle air flow through the IAC motor to
prevent engine stalling. The PCM sends 12 volts through a resister to the sensor circuit to ground. When pump pressure is low, the switch is closed.
