2011 FORD KUGA ECT

SECTION 211-02 Power Steering
VEHICLE APPLICATION:2008.50 Kuga
PA G E
CONTENTS
DESCRIPTION AND OPERATION
211-02-2
Power Steering (Component Location) ........................................................................\
......
211-02-3
Power Steering (Overview) ........................................................................\
.........................
211-02-3
Power Steering ........................................................................\
...........................................
211-02-4
Steering gear ........................................................................\
..............................................
211-02-5
Electro-hydraulic power steering pump ........................................................................\
......
211-02-6
Pressure and return lines ........................................................................\
...........................
211-02-7
Power Steering (System Operation and Component Description) .....................................
211-02-7
System Diagram ........................................................................\
.........................................
211-02-8
System Operation ........................................................................\
.......................................
211-02-8
Electronic principle of operation ........................................................................\
..............
211-02-9
Hydraulic principle of operation ........................................................................\
..............
211-02-9
Component Description ........................................................................\
..............................
211-02-9
Electro-hydraulic power steering pump ........................................................................\
..
211-02-10
Integrated steering angle sensor - vehicles built up to 09/2009 .....................................
211-02-11
Brushless DC motor with integral power steering module..............................................
REMOVAL AND INSTALLATION
211-02-13
(13 443 0)
Power Steering Pressure Line and Return Line Assembly — 2.5L Duratec
(147kW/200PS) - VI5 ........................................................................\
............
211-02-18
(13 434 0)
Power Steering Pump — 2.5L Duratec (147kW/200PS) - VI5 .......................
211-02-21
(13 440 0;
13 443 0)
Power Steering Pump to Steering Gear Pressure Line — 2.5L Duratec
(147kW/200PS) - VI5 ........................................................................\
............
211-02-25
(13 116 0)
Steering Gear ........................................................................\
.........................
211-02-36
(13 439 0)
Steering Gear to Power Steering Fluid Reservoir Return Line — 2.5L Duratec
(147kW/200PS) - VI5 ........................................................................\
............
211-02-1
Power Steering
211-02- 1
.
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Power Steering – Overview
Power Steering
E96186
1
2
3
4
5
6
Description
Item
Reservoir
1
Electro-hydraulic power steering pump
2
power steering return hose
3Description
Item
Power steering fluid pressure line
4
Heat shield
5
Steering gear
6
The EHPS system uses an electrically driven
hydraulic pump and a conventional rack and pinion
steering gear. This ensures precise steering operation and steering assistance with minimum
energy consumption.
G1001269en2008.50 Kuga8/2011
211-02-
3
Power Steering
211-02- 3
DESCRIPTION AND OPERATION
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Steering gear
E96209
1
2
3
4
5
1
2
63
Description
Item
Tie-rod end
1
Tie-rod
2
steering gear boot
3Description
Item
Steering angle sensor - vehicles built up
to 09/2009
4
Input shaft
5
Valve unit housing
6
The steering gear is mounted on the front axle
crossmember and is secured with two bolts. The
bolts are inserted in the steering gear from above
and screwed into the threaded lugs on the front
axle crossmember.
The following components can be renewed
separately or as a unit:
• Complete steering gear
• Steering gear rubber bushes
• Tie rods.
• Steering gear boot
• Tie-rod end
• Steering angle sensor - vehicles built up to 09/2009 During removal and installation or renewal of
components of the steering gear, pay attention to
the following: (excluding steering angle sensor)
• Before undertaking repair work on an accident
damaged steering gear, the scope of the repair
must be determined using the inspection
instructions "Steering gear inspection after an
accident". For additional information, refer to
"Diagnosis and Testing" in this section.
• When the steering gear is removed and installed, the front axle crossmember must be
aligned with the bodywork using the appropriate
special tools.
• After completing the work, the suspension geometry of the vehicle must be checked and
corrected as necessary.
G1001269en2008.50 Kuga8/2011
211-02- 4
Power Steering
211-02- 4
DESCRIPTION AND OPERATION
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Electro-hydraulic power steering pump
E96414
1
2
3
4
5
3
Description
Item
Electro-hydraulic power steering pump
1
Cap, reservoir
2Description
Item
Rubber bushes, electro-hydraulic power
steering pump
3
Bracket #1
4
Bracket #2
5
The electro-hydraulic power steering pump is
mounted at the front right-hand side in the wheel
housing. The following components may be renewed:
• Electro-hydraulic power steering pump
• Cap, reservoir
G1001269en2008.50 Kuga8/2011
211-02-
5
Power Steering
211-02- 5
DESCRIPTION AND OPERATION
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• Rubber bushes, electro-hydraulic power steeringpump
• Bracket #1
• Bracket #2
During removal and installation or renewal of
components of the electro-hydraulic power steering
pump, pay attention to the following:
• Before starting work to renew the electro-hydraulic power steering pump, the
program code of the electro-hydraulic power steering must be read out using the diagnostic
unit and noted.
• After the work to renew the electro-hydraulic power steering pump is completed, the
electro-hydraulic power steering must be
reconfigured using the diagnostic unit. For
further information, see: Module Configuration
(418-01 Module Configuration, General
Procedures).
• The electro-hydraulic power steering pump must be filled and vented as specified.
Pressure and return lines
E96417
1
2
3
4
Description
Item
power steering return hose
1
Power steering fluid pressure line
2Description
Item
Bracket #1
3
Bracket #2
4
G1001269en2008.50 Kuga8/2011
211-02- 6
Power Steering
211-02- 6
DESCRIPTION AND OPERATION
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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.
G1001270en2008.50 Kuga8/2011
211-02-
8
Power Steering
211-02- 8
DESCRIPTION AND OPERATION
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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
G1001270en2008.50 Kuga8/2011
211-02-
9
Power Steering
211-02- 9
DESCRIPTION AND OPERATION
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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
G1001270en2008.50 Kuga8/2011
211-02-
10
Power Steering
211-02- 10
DESCRIPTION AND OPERATION
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