2011 FORD KUGA bus

System Operation
Electric Booster Heater
In diesel vehicles which give off little residual heat,
a booster heater is used to heat the passenger
compartment rapidly in the case of low ambient
temperatures.
If the interior temperature has been set to HI, or if
the heater controls have been switched to the
highest setting, the two-zone air conditioning
system sends an "electric booster heater ON"
request signal to the CAN (controller area network)
via the medium speed GEM bus. If a manual air
conditioning system is installed, the signal is
transmitted via a conventional cable connection.
The GEM switches on the electric booster heater
depending on the following parameters:
• Engine coolant temperature is below 60 °C.
• Ambient air temperature is below 10 °C.
• Sufficient generator capacity is available.
The electric booster heater electronics activate
three output stages as a function of a pulse width
modulated signal PWM (pulse width modulation)
generated by the GEM. The output stages switch
the three heating elements of the electric booster
heater ON or OFF individually, whereby the heating
periods of the individual elements can overlap. Due
to the variable switch-on duration, continuously
variable temperature control is possible. The overall
heating power of the three heating elements is
linearly proportional to the PWM signal. If the PWM
signal is below 10% or above 95%, the electric
booster heater is not activated.
The electric booster heater is switched off when
an engine coolant temperature of 70°C or an
ambient air temperature of 20°C is exceeded.
Fuel-fired heater - function diagram G1066982en
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Description
Item
Glow plug
1
Combustion Air Blower
2
Fuel pump
3
Fuel-fired heater on
4
Fuel-fired heater - large regulating step
5
Fuel-fired heater - small regulating step
6 Description
Item
Fuel-fired heater off
7
Blower motor on
8
Flame detection
9
Blower motor off
10
Large regulating step
11
Small regulating step
12
Boost heat mode
When the engine is running, the booster heater
helps the engine to heat the passenger
compartment at low ambient temperatures.
When the coolant temperature reaches 30 °C, the
control unit transmits a switch-on signal for the
passenger compartment blower via the CAN bus.
When the coolant temperature drops, the blower
remains on until the temperature reaches 20 °C
whereupon it is deactivated.
The fuel tank must be filled to at least 14% for the
system to be switched on. If the fuel level drops
below 8% then the system is switched off.
In boost mode, the fuel fired booster heater is only
switched on if all of the following criteria are met:
• Engine speed above 500 rpm. The fuel fired booster heater is not allowed to start up while
the engine is being cranked; this prevents a
shut-down due to low voltage if the battery
charge is low.
• Ambient temperature below 5 °C.
• Fuel level above 14% of total capacity.
• Function is active on the trip computer menu.
One of the following conditions is sufficient to
switch off the booster heater in boost heat mode:
• Engine speed below 500 rpm.
• Ambient temperature above 11 °C.
• Function is active on the trip computer menu.
• Fuel level below 8% of total capacity.
Programmable fuel fired booster heater
The programmable fuel fired booster heater has
two operating modes:
• Instant start
• Programmed start
The heater status is displayed on the instrument
cluster display. The parking heater mode is controlled via a menu in the message centre. The
fuel fired booster heater can be activated and
deactivated via the message centre. (If set to 'Auto'
the system is activated, if set to 'Off' the system is
completely deactivated)
Immediate start-up of the booster
heater
This function enables the fuel-fired booster heater
to be switched on manually when the engine is not
running. This function is activated via the menu on
the driver information system.
The ignition key must be in the II" position before
this menu can be accessed. The timer function of
the booster heater remains active when the ignition
key is in position "0".
After an immediate start-up of the booster heater
it is switched off again after 30 minutes (or if the
fuel level in the fuel tank drops below 8%). The
booster heater stops within 2 minutes of the engine
starting. This leaves enough time to check whether
the switch-on conditions for boost heat mode have
been met, thus preventing the booster heater from
having to switch off and switch back on again. The
heater can be switched off manually at any time
from the menu.
Programmed start-up of the booster
heater
The driver can use a menu to adjust the time at
which the vehicle is to be pre-heated. The following
options are available:
• Time setting. One or two times can be
programmed for each day of the week. It is
possible to program days either individually or
together in groups (Mon-Sun/Mon-Sat/Mon-Fri).
• Time and data setting
With the first option, the fuel-fired booster heater
will start repeatedly without needing to be G1066982en
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reprogrammed. However, if the engine hasn't been
run since the last programmed start, the fuel-fired
booster heater will not start up the second time so
as to prevent the battery from being discharged.
The length of time required to pre-heat the vehicle
is calculated in the control unit of the fuel-fired
booster heater and is based on two temperature
values:
• Ambient air temperature: this message is taken
from the GEM via the CAN bus.
• Coolant temperature: this is determined via an internal sensor in the fuel-fired booster heater.
The maximum heating time is 30 minutes at an
outside air temperature of -10 °C or lower. The
heating time decreases proportionally with
increasing ambient temperature until the ambient
temperature is between +15 °C and +20 °C. Then
the minimum heating time is 10 minutes. The
parking heater is deactivated at temperatures
above +20 °C.
The sequence for a programmed start of the
booster heater is as follows:
• Two minutes before the start of the maximum heating time the driver information
system/instrument cluster sends an activation
message to the fuel-fired booster heater via the
CAN bus.
• The fuel-fired booster heater calculates the required heating time and, if necessary, sends
a delay request on the CAN bus.
• At the calculated time, the fuel-fired booster heater starts up. The conditions for start-up are:
engine not running and amount of fuel in the
fuel tank is above 14% of maximum.
• When the coolant temperature reaches +30 °C, the control unit of the fuel-fired booster heater
sends a request to switch on the passenger
compartment blower.
• Eight minutes after the programmed switch-off time, the booster heater stops heating mode
and starts a run-on operation to clean the
system's spark plugs.
• Ten minutes after the switch-off time, the post-cleaning operation is complete. The
additional ten minutes run-on time provides
some leeway in case the driver is late arriving.
After a programmed start-up of the booster heater
it is switched off again after the heating time has
elapsed (or if the fuel level in the fuel tank drops
below 8%). The booster heater stops within 2 minutes of the engine starting. This leaves enough
time to check whether the switch-on conditions for
boost heat mode have been met, thus preventing
the booster heater from having to switch off and
switch back on again. The heater can be switched
off manually at any time from the menu.
Whilst the fuel-fired booster heater is in additional
heating mode and/or parking heating mode, the
instrument cluster receives a fuel consumption
signal; this is used to re-calculate the vehicle's
remaining range and fuel consumption data.
Emergency shutoff
In the event of an accident in which the airbags
are deployed, the control unit of the fuel-fired
booster heater receives a message on the CAN
bus from the restraints control module (RCM).
When this message is received, the booster heater
system switches off immediately.
The booster heater control module deactivates the
system and does not respond to further messages
on the CAN bus. The booster heater control module
needs to be activated with WDS.
Component Description
Electric Booster Heater
The electric booster heater consists of three
individual heating elements, which are incorporated
into a single housing. It is controlled by the generic
electronic module (GEM), taking into account the
following factors:
Detailed illustration of fuel-fired heater
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Description
Item
Cooling sleeve cover
1
Combustion air blower cover
2
Fuel fired additional heater module
3
Combustion Air Blower
4
Cooling sleeve
5
Glow plug
6
Flame sensor
7
Overheat Sensor
8 Description
Item
ECT9
Compression spring
10
'O' Ring
11
Internal wiring harness - fuel fired
additional heater
12
Gasket
13
Gasket
14
Heat exchanger
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Description
Item
Combustion chamber
16
'O' Ring
17 Description
Item
Combustion blower motor cover
18
Glow plug wiring harness
19
Flame sensor
If the flame goes out independently during
operation of the booster heater, a restart is carried
out. If the booster heater does not ignite within 90
seconds of fuel delivery or if the flame goes out
within 15 minutes of starting, a lockout will be
implemented by the flame sensor.
Lockout can be cancelled by switching the booster
heater off then on again, although this may only
be repeated at most 2 times.
Overheat Sensor
The overheating sensor enables the fuel-fired
booster heater module to determine the coolant
temperature, protecting the heater from
overheating. The overheating sensor is installed
next to the coolant temperature sensor under a
cover on the top of the fuel-fired heater.
In the event of overheating (lack of water, poorly
ventilated coolant circuit), the fuel supply to the
heater is interrupted and a lockout occurs. After
the cause of the overheating has been eliminated,
the heater can be restarted by switching it off and
on again, if the coolant temperature is below 70°C.
If the heater overheats ten times in a row, the
control unit is locked.
ECT
The fuel-fired booster heater module uses the
temperature sensor to determine the coolant
temperature, which it then uses to set the starting
and stopping time. The coolant temperature sensor
is installed next to the overheating sensor under a
cover on the top of the fuel-fired heater. Water pump The coolant pump is located on the holder for the
fuel-fired heater on the bulkhead in the rear of the
engine compartment. The coolant pump is driven
by a built-in electric motor and circulates the
coolant in the engine cooling system. The delivery
rate for the pump is 820l/h at a delivery pressure
of 0.1 bar.
Fuel pump
The fuel required for the fuel-fired heater is taken
from the fuel system by a fuel pump fitted in the
fuel tank and is delivered to the heater via a fuel
line.
The fuel pump is an electric piston pump which
meters the corresponding fuel volume for the
fuel-fired heater according to a cycle set by the
fuel-fired heater module.
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Description
Item
Instrument Cluster
1
PCM (powertrain control module)
2
EHPS (electro-hydraulic power steering)
control module
3
Audio unit
4
GEM (generic electronic module)
5
RCM (restraints control module)
6
PATS transceiver
7 Description
Item
Steering wheel lock module
8
Left-hand steering column switch
9
Fuel level sensor
10
Washer water level warning lamp switch
11
Accelerator pedal position sensor
12
CPP (clutch pedal position) sensor/BPP
(brake pedal position) sensor
13
Lighting control switch
14
System Operation
Instrument Cluster
The instrument cluster contains analog displays
as well as warning and control lamps for displaying
the system status; in addiiton, there is an LCD
indicator field for driver information.
The instrument cluster receives the following
signals from the PCM via the high speed CAN
(controller area network) Bus (HS-CAN):
• Vehicle speed – The PCM receives the necessary signalsfrom the ABS (anti-lock brake system) wheel
sensors from the ABS control unit on the
HS-CAN.
• Engine Coolant Temperature
• Engine oil pressure.
• Engine speed
The instrument cluster receives the following
signals from the GEM via the medium speed CAN
Bus (MS-CAN):
• Ambient temperature
• Brake fluid level
• Handbrake control
• Door latch control
• Liftgate latch control
• High beam control
• Headlamp flasher control
• Direction indicator control
The fuel level signal is sent by the two fuel level
sensors in the fuel pumps in the semitrailer tank,
which is wired to the instrument cluster. The
sensors are connected in series, and the total
resistance is determined from the two individual resistors. The instrument cluster converts the raw
fuel level signal into a damped fuel level value.
The odometer shows the total distance travelled
by the vehicle and is based on the same signal as
is processed for the daily mileage counter. The
value is recorded by the instrument cluster and
stored in a protected EEPROM (Electronically
Erasable Programmable Read Only Memory) area.
This area is a memory protected against
manipulation. If the instrument cluster detects an
error in this memory area, e.g. through damage,
the driver is notified with the "Odometer error"
message.
Message center
The message center is operated using the left-hand
switch on the steering column.
The SET/RESET button is activated to select a
submenu and change the settings. If signal tones
have been activated, a short acoustic signal will
sound each time a button is pressed.
By turning the rotary switch, the different menu
displays can be scrolled through or a setting
selected.
In this display, the navigation system can also
display direction and distance information.
In addition, safety and warning messages can be
displayed in this system, such as "Coolant
overheating", "Engine system error" or "Washer
fluid level too low". In addition to a safety message,
a general warning light (red/yellow) lights up.
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Instrument Cluster
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Description
Item
Rear parking aid sensorRefer to Component Description: Parking
aid sensors (page ?)
7
Rear parking aid sensorRefer to Component Description: Parking
aid sensors (page ?)
8 Description
Item
Rear parking aid sensorRefer to Component Description: Parking
aid sensors (page ?)
9
steering angle sensor
10
Navigation device
11
System Operation
Parking Aid WARNING: It is the driver's responsibility
to stay alert during reversing procedures.
The system may fail to detect small
children or animals.
CAUTION: The driver is responsible for
detecting obstacles and judging the
distance between these and the vehicle.
The system may fail to detect some
hanging objects, barriers, narrow obstacles
or painted surfaces, which could damage
the vehicle. Always pay attention when
parking.
The parking aid provides an audible warning to the
driver if there are any obstacles in front of or behind
the vehicle during reverse parking maneuvers.
At low speeds, the parking aid module uses the
parking aid sensors to monitor the area around the
vehicle. If an object is detected within a monitored
area, the parking aid module emits a warning tone
using the respective parking aid speaker.
The rear parking aid is switched on with the
ignition. However, it is only enabled when reverse
gear is selected.
The front and rear parking aid is always switched
off when the ignition is switched on. It is switched
on when reverse gear is selected or if the parking
aid switch in the center console is actuated up to
a speed of 16 km/h.
The parking aid is switched off when the vehicle is
travelling forwards at more than 16 km/h or if the
parking aid switch in the center console is actuated
again.
When the parking aid module activates the system,
the parking aid switch LED is illuminated. If the
vehicle is only fitted with the rear parking aid, there
is no switch.
The parking aid sensors emit a series of ultrasonic
impulses and switch to receiver mode to receive the echo reflected by an obstacle within the
detection range. The received echo signals are
amplified and converted from an analog signal to
a digital signal by the sensor. The digital signal is
passed to the parking aid module and compared
with pre-programmed data stored in an EEPROM
within the module. The module calculates the
distance to the obstacle by measuring the time
taken between the emitted and received impulses.
If no objects are detected there are no further
warning tones. If an object is detected, repeated
audible tones are emitted from either parking aid
speaker(s) as appropriate. The time delay between
the tones decreases as the distance between the
object and the vehicle decreases, until at
approximately 250 mm (10 inches), the audible
tone becomes continuous.
If the distance between the obstacle and the
vehicle does not decrease, the warning tone
remains constant if the object has been detected
by an internal parking aid sensor. If the obstacle
was detected by an external sensor and the
distance remains unchanged, the warning tone
stops after 3 seconds.
The parking aid module continues to monitor the
distance and will resume the warning tones if a
decrease in distance is detected.
If a trailer is connected to the vehicle, a signal is
sent to the GEM (generic electronic module) via
the trailer relay. This signal is sent to the parking
aid module via the MS CAN bus. When the parking
aid module detects that a trailer is connected to
the vehicle, the rear parking aid sensors are
disabled to prevent constant warnings due to the
close proximity of the trailer.
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Parking Aid
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Component Description
Rear parking aid speaker
The rear parking aid speaker, in addition to its
actual function, is also used for audible indication
of various types of error in the front and rear
parking aids. If the rear parking aid speaker
becomes defective, the front parking aid speaker
will then be used to indicate failure modes.
If an error is detected in the system, a signal tone
is emitted via the speaker for 3 seconds.
Parking aid sensors
CAUTIONS:
Always keep sensors free from dirt, ice and
snow. Do not use any sharp objects to
clean the sensors.
If a high-pressure cleaner is used to wash
the vehicle, the jet must only be aimed at
the sensors briefly at a distance of at least
20 cm.
The parking aid sensor consists of the following:
• Plastic housing
• Aluminum membrane with Piezo disc
• Decoupling ring
• Printed circuit board (PCB)
The parking aid sensor consists of a sensor and a
holder. The holder makes sure that each parking
aid sensor is correctly orientated in relation to its
location in the rear bumper.
The sensors have a 3-pin connector which is
connected to the wiring harness of the front
bumper. This in turn is connected to the main body
wiring harness. Three pins provide for power
supply, ground and signal lines to and from the
parking aid module. The disc resonates at a frequency of ca. 50kHz,
producing the ultrasonic output. The disc also
receives the reflected echo signal from any objects
within range.
Parking aid module
The parking aid module has three connectors which
provide for power, ground and MS CAN bus
connections, as well as the front and rear parking
aid sensors, the parking aid switch and parking aid
speaker.
The parking aid module carries out self-check
routines and when the parking aid is active, checks
the parking aid sensor wiring for short or open
circuits. If a concern is detected, a diagnostic
trouble code (DTC) is stored in a memory in the
parking aid module and the front and rear parking
aid sensors will be disabled until the DTC is cleared
and the ignition cycled. The driver recognizes a
problem through the flashing LED and a shrill
continuous tone, which is emitted for 3 seconds
when the parking aid is activated. If the parking aid
is working properly, short tones are emitted instead
of this continuous tone. DTCs can be read using
the Ford approved diagnostic tool through the data
link connector (DLC).
G1034399en
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Parking Aid
413-13-15
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