Power steering FORD KUGA 2011 1.G Service Manual

Description
Item
Electro-hydraulic power steering pump
with integrated power steering moduleRefer to Component Description:
Electro-hydraulic power steering pump
(page5)
1
Ignition switch
2
Generic electronic module (GEM)
3
Data link connector (DLC)
4
Powertrain Control Module (PCM)
5
ABS module or ESP module
6Description
Item
Steering gear
7
Integrated steering angle sensor - vehicles
built up to 09/2009RefertoComponentDescription:(page
10)
8
High pressure pipe
9
Fluid Return Line
10
Battery junction box (BJB)
11
Battery
12
System Operation
Electronic principle of operation
The power steering module requires the following
information in order to ensure precise steering
behavior in all driving situations:
• Steering wheel position
• Rate of turn of the steering wheel
• Vehicle speed
• Information about the vehicle configuration
• Information about the ignition switch position
• Instantaneous engine operating status
The required information is made available to the
power steering module via direct connections and
via the CAN bus (refer to the flow chart).
The steering wheel position and the rate of turn of
the steering wheel are transmitted to the power
steering module as PWM signals from the steering
angle sensor. The steering angle sensor receives
its voltage and ground supply from the power
steering module and operates inductively with an
input voltage of 5 V.
The vehicle speed is made available to the power
steering module as a CAN bus signal from the ABS
module or ESP module. The engine operating status is made available to
the power steering module as a CAN bus signal
from the PCM.
The power steering module obtains the vehicle
configuration information via the CAN bus from the
GEM. This information is required by the power
steering module in order to define the internal
characteristics of the power steering.
The power steering module obtains information
about the current ignition switch position via the
voltage input (terminal 15) of the ignition switch.
Whilst constantly monitoring the relevant input
signals the power steering module accesses stored
maps. With the aid of this information the pump
speed is matched to the current driving situation.
An electronic diagnosis of the electro-hydraulic
power steering can be performed with the aid of a
diagnostic tester via the DLC of the vehicle. For
additional information please refer to "Diagnosis
and Testing" in this section.
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Power Steering
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Hydraulic principle of operation
E96442
3
4
5
7
8
6
1
2
Description
Item
Reservoir
1
Valve unit
2
Steering rack and pinion
3
Flow control/pressure relief - return
4
Flow control/pressure relief valve
5Description
Item
Outlet of the power steering pump
6
Electro-hydraulic power steering pumpRefertoComponentDescription:(page
5)
7
Low pressure suction line
8
When the engine is started, the electro-hydraulic
power steering pump sucks in power steering fluid
from the reservoir. The fluid flows through the pump
and is discharged under high pressure from the
outlet. The high-pressure line carries the power
steering fluid to the servo valve.
If no steering effort is applied, there is no resistance
to the circulation of power steering fluid and the
supply pressure from the pump is very low. Only
minimal pressure is applied by the servo valve to
the two sides of the piston in the working cylinder.
When the steering wheel is turned in either
direction, the return flow of fluid to the reservoir is restricted by the servo valve, causing the pressure
to increase on the supply side. The power steering
fluid is directed by the servo valve to the
corresponding side of the piston in the working
cylinder, providing the power assistance required
to reduce the steering effort. The power steering
fluid which is displaced towards the low-pressure
side of the cylinder flows through the servo valve
and the return line back to the reservoir.
Component Description
Electro-hydraulic power steering pump
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E96312
1
2
3
Description
Item
Reservoir
1
Hydraulic pump
2
Brushless DC motor with integral power
steering moduleRefertoComponentDescription:(page
11)
3
NOTE: The power steering pump must be filled
and vented as specified.
The electro-hydraulic power steering pump
comprises a brushless DC motor, the hydraulic
pump and the power steering fluid reservoir.
The hydraulic pump is a gear pump; a resonance
chamber incorporated into the pump body reduces
noise emissions.
The operating pressure is also regulated by means
of a pressure limiting valve which is integrated in
the pump housing. The pressure limiting valve
stabilizes the throughput to the steering gear to a
particular level independently of engine speed.
The pressure relief valve will operate if the
discharge from the pump is restricted, for example, steering held on full lock. If the output from the
pump is blocked, all output is recirculated through
the pump. As no fresh fluid from the reservoir is
drawn into the pump in the process, the
temperature of the power steering fluid in the pump
quickly increases. Consequently, periods of holding
the steering wheel at full lock should be kept to a
minimum to prevent overheating of the pump and
the power steering fluid within it.
The pressure limiting valve limits the pressure on
the outlet side to 120 bar.
Integrated steering angle sensor - vehicles
built up to 09/2009
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E96430
The steering angle sensor is a inductive sensor.
The steering angle sensor monitors the steering
wheel position and the rate of turn of the steering
wheel. This information is sent to the power
steering module.
On vehicles built from 09/2009the power steering
module uses the information from the steering angle sensor at the steering column. The required
information is made available to the power steering
module via the CAN bus.
Brushless DC motor with integral power
steering module
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1
2
3
45
6
7
8
9
10
E42460
Description
Item
Connector
1
Power steering module
2
Seal
3
Bearing
4
Shaft
5Description
Item
Cover
6
Rotor with magnets
7
Stator8
Distributor
9
Bearing
10
In the electrohydraulic power steering system, a
brushless 12 volt direct current motor drives the
hydraulic pump. Higher pumping rates are only
provided when they are required for steering
manoeuvres. This avoids unnecessary energy
consumption in the majority of phases in a drive
cycle.
Commutation in the motor is done electronically.
As a result, there are no brushes to wear away.
The entire system is designed for maintenance-free
operation.
In more than 85% of all driving situations, the
power steering pump operates at standby speed
and consumes less than 4A. However, pump speed
can quickly increase to full rotational speed if
emergency steering manoeuvres require it. The system has a continuously variable pump
rotational speed.
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Power Steering
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Power Steering Pressure Line and Return Line Assembly — 2.5LDuratec (147kW/200PS) - VI5(13 443 0)
General Equipment
Hose Clamp Remover/Installer
Removal
NOTE: Removal steps in this procedure may
contain installation details.
1. Refer to: Steering System Health and Safety
Precautions (100-00 General Information,
Description and Operation).
2. Refer to: Wheel and Tire (204-04 Wheels and
Tires, Removal and Installation).
3.
E98543
x7
4.
E99630
5.
E99631
6. WARNING: Be prepared to collect escaping fluid.
1. General Equipment: Hose ClampRemover/Installer
2. Torque: 30
Nm
E114706
1
2
7. Torque: 23Nm1.
2. Torque: 7
Nm
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Power Steering
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E112634
2
1
8.Torque: 4Nm
E99258
9. WARNING: Be prepared to collect
escaping fluid.
CAUTION: Make sure that all openings
are sealed.
Torque: 18
Nm
E114705
10.
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Power Steering
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E114708
Installation
1. NOTE:This step is only necessary when
installing a new component.
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E114707
x4
2.To install, reverse the removal procedure.
3.
E141077
4.
E141078
5. NOTE: Make sure the fluid in the reservoir does
not fall below the MIN mark, as air could enter
the system.
Slowly turn the steering wheel from lock to lock
five times.
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E131522
123
6.
E141079
12
7.
E141077
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211-02- 17
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