Ford Galaxy / Ford S-MAX. Manual — part 688

Description

Vehicle engine

Fuel pump module

Fuel tank

Heat exchanger with blower motor

Fuel fired booster heater

Air inlet

Exhaust pipe

Wate pump

Overview - Fuel-fired additional heater

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Description

Combustion air blower

Glow plug

Water outlet

Water ingress

Temperature sensor

Overheat Sensor

Burner

Heater core.

Venturi burner

Exhaust gas leakage.

Fuel entry

Combustion air entry

Electronic Control Unit

Additional heater operation (diesel vehicles only)

When the engine is running, the fuel-fired additional heater assists the engine in heating up
the passenger compartment at low ambient temperatures, if the vehicle has an engine that
gives off only a small amount of heat.

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When the coolant temperature reaches a minimum value, the control unit transmits a
switch-on signal for the passenger compartment blower via the CAN bus in vehicles with
automatic air conditioning. When the coolant temperature drops, the blower remains on
until the temperature reaches around 20 °C whereupon it is deactivated. On vehicles with
manual air conditioning, the driver must switch the blower on.

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 additional heater is only switched on if all of the
following criteria are met:

Engine speed above 500 rpm The fuel-fired additional 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.
Switch is at "on" position on the trip computer menu.

One of the following conditions is sufficient to switch off the additional heater in boost
heat mode:

Engine speed below 500 rpm.
Ambient temperature above 11 °C.
Switch is at "off" position on the trip computer menu.
Fuel level below 8% of total capacity.

Fuel powered booster heater with additional parking heater function

The fuel powered booster heater with additional parking heater function has two modes of
operation: immediate start-up and programmed start-up.

The heater status is displayed on the instrument cluster display. The parking heater mode
is controlled via a menu on the driver information system. The fuel-fired additional heater
can be activated and deactivated via the driver information system. (If set to '"Auto" the
system is activated, if set to "Off" the system is completely deactivated.) The system is
operated from a control menu on the steering wheel.

Immediate start-up of the fuel powered booster heater

This function enables the fuel-fired additional heater to be switched on manually when the
engine is not running. The function is activated using the steering wheel control menu in
the driver information system.

The ignition key must be in the "II" position before this menu can be used. The timer
function for the fuel powered booster heater remains active when the ignition key is in
position "0".

After an immediate start-up of the fuel powered booster heater it is switched off again after
30 minutes (or if the fuel level in the fuel tank drops below 8%). The fuel powered 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
fuel powered 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 fuel powered 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 date setting

With the first option, the fuel-fired additional heater will start repeatedly without needing to
be reprogrammed. However, if the engine has not been running since the last programmed
start, the fuel powered booster heater will not start up a second time 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 additional heater and is based on two temperature values:

Ambient air temperature: this message is taken from the Generic Electronic Module
(GEM) via the CAN bus.
Coolant temperature: this is determined via an internal sensor in the fuel-fired additional
heater.

The maximum heating time is 30 minutes at an outside air temperature of -10°C or lower.
The heating time decreases proportionally as the ambient temperature increases until the
ambient temperature is +15°C. Then the minimum heating time is 10 minutes. The parking
heater is deactivated at temperatures above +15°C.

The sequence for a programmed start of the fuel powered 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 additional heater
via the CAN bus.
The fuel-fired additional heater calculates the required heating time and, if necessary,
sends a delay request on the CAN bus.
At the calculated time, the fuel-fired additional heater starts up. The conditions for start-
up are: engine not running and fuel level above 14% of total capacity.
When the coolant temperature reaches around +30°C , the fuel-fired additional heater
sends a request to switch on the passenger compartment blower.
Eight minutes after the programmed switch-off time, the fuel powered 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 fuel powered 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
fuel powered 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 fuel powered 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 additional 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 fuel powered booster
heater module receives a message on the CAN bus from the restraints control module
(RCM). When this signal is received, the fuel powered booster heater system is immediately
deactivated .

The fuel powered booster heater module deactivates the system and does not respond to
further messages on the CAN bus. The fuel powered booster heater module needs to be
activated with the diagnostic unit.

Initial operation