This vehicle is available with 3 different types of power steering.
They are standard, firm-feel, or
speed-sensitive variable-effort (speed-proportional) power steering.
The firm-feel steering gear is physically the same
as the standard gear used on some models. The difference
is internal to the gear. The internal calibration
gives the driver a more firm feel at the steering
wheel. It is serviced the same as the standard steering
The speed-sensitive variable-effort power steering
system, better known as speed-proportional steering,
is an electronically controlled, variable-effort type
power steering system. The steering gear has an
externally mounted control valve which in conjunction
with mechanical components varies steering
effort at different vehicle speeds. At low speeds lower
steering effort is provided to allow ease in steering
and parking. At higher speeds, higher effort is provided
to give a more firm, responsive steering feel.
OPERATION - SPEED PROPORTIONAL
The speed-proportional power steering system
reduces the steering effort required by the driver for
low speed driving and parking maneuvers. Also, at
higher speeds, more steering effort is required providing
a more firm, responsive feel to the steering
system and driver.
With the engine running and the vehicle speed
between 0 km/h (0 mph) and approximately 32 km/h
(20 mph), minimum steering effort is required.
Between approximately 32 km/h (20 mph) and 100
km/h (60 mph), power steering effort will gradually
increase based upon vehicle speed. Above approximately
100 km/h (60 mph), maximum steering effort
is provided by the speed proportional steering system.
Variable-effort power steering is provided by controlling
power steering fluid pressure at the power
steering gear. A solenoid control valve located on the
steering gear (Fig. 2) is used to control power steering
gear return fluid pressure. The pressure is controlled
by varying the size of an orifice.
The variable-assist speed-proportional solenoid control
valve is controlled by the Body Control Module
(BCM). The BCM receives the vehicle speed signal
sent from the Powertrain Control Module (PCM).
Upon receiving the vehicle speed signal from the
PCM, the BCM converts that speed signal into an
electrical current usable by the solenoid control valve
for controlling the variable effort of the power steering
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