2007 FORD FIESTA Workshop Manual

303-1 4-5 Electronic Engine Controls 303-1 4-5
DESCRIPTION AND OPERATION
Item Description Item Description
2006.0 Fiesta 1212006 G204204en
I 1 I Temperature and Manifold Absolute
2 3 1 Knock Sensor (KS)
pressure (T-MAP) sensor
Throttle Position (TP) sensor
4 Sensor - Engine Coolant Temperature
(ECT)
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303-1 4-6 Electronic Engine Controls 303-1 4-6
DESCRIPTION
AND OPERATION
Item Descri~tion
1 5 1 Crankshaft Position (CKP) sensor 1
Throttle Control Unit (TCU)
1 6 ( Camshaft Position (CMP) sensor I Components
1 7 1 Heated Oxygen Sensor (H02S) I
1 8 1 Power Steering Pressure (PSP) sensor I
1 10 1 Brake Pedal Position (BPP) switch I
9 Vehicle Speed Sensor (VSS)
(only on
vehicles without Anti-lock Braking System
(ABS))
1 12 1 Clutch Pedal Position (CPP) switch I
11
1 13 1 Generator I
Accelerator Pedal Position (APP) sensor
1 14 1 Current supply relay I
1 15 1 Ignition key I -
16
17
1 20 1 Inertia fuel shut-off switch I
Battery
Powertrain Control Module (PCM)
-
18
19
1 21 1 Fuel Pump Driver Module (FPDM) I
Data Link Connector (DLC)
Fuel Pump (FP) relay
1 22 1 Fuel injectors I
23 Evaporative emissions (EVAP) solenoid
1 lvalve
1 24 1 Idle Air Control (IAC) valve 1
1 25 1 Throttle Control Unit (TCU) I
26 Air Conditioning (AIC) compressor clutch
1 I 1 blower switch
1 27 1 Injector Driver
Module (IDM) I
1 28 1 Start inhibit relay I
1 29 1 Instrument cluster I
Item Descri~tion
I I ITP sensor I
1 2 1 Electric motor I
The electronically controlled throttle control unit
(TCU) consists of the following components:
Housing
Throttle flap
Throttle flap spindle
Gear set
Electric motor with pinion
TP sensor
Stop screw
Throttle flap return spring
2006.0 Fiesta 1212006 G204204en
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303-1 4-7 Electronic Engine Controls 303-1 4-7
DESCRIPTION AND OPERATION
Function The throttle flap position is adjusted and monitored
in a closed control loop. The TP sensor provides
I A CAUTI0N:The throttle control unit (TCU)
the PCM with the information on the actual position
must not be dismantled. No adjustments
of the throttle flap.
or repairs can be made to the TCU.
Item Description
I I I stop screw I
1 2 IToothed segment I
1 3 1 Throttle flap spindle I
1 4 1 Throttle flap return spring I
1 5 1 Intermediate shaft with gear I
1 6 1 Electric motor with pinion I
The APP sensor sends the data containing the
driver's acceleration requirement to the PCM. This
information depends directly on the movement of
the accelerator pedal.
The PCM processes this information and converts
it into an output signal for the throttle control unit
(TCU). This output signal is the control for the
electric motor.
The electric motor moves the throttle flap spindle
by means of the gear set.
Standby function
If a fault develops in the throttle control unit (TCU),
a standby function is carried out. This standby
function allows a slight opening of the throttle flap, so that enough air passes through to allow limited
engine operation.
For this purpose, there is an throttle flap adjustment
screw on the throttle housing. The return spring
closes the throttle flap until the stop of the toothed
segment touches the stop screw. In this way a
defined throttle flap gap is formed for limp home
mode.
The stop screw has a spring loaded pin, which
holds the throttle flap open for limp home mode.
In normal operating mode, this spring loaded pin
is pushed in by the force of the electric motor when
the throttle flap must be closed past the limp home
position
(e.g. for idle speed control or overrun
shutoff).
CPP switch
The CPP switch is located directly on the pedal
box.
The engine management recognises gearshifts
through the CPP switch and thus improves engine
running characteristics.
The CPP switch passes a ground signal to the
PCM when the clutch pedal is depressed
(disengaged).
2006.0 Fiesta 1212006 G204204en
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Electronic Engine Controls
DESCRIPTION AND OPERATION
(Brake Pedal Position) BPP switch
APP sensor
There are two brake pedal switches at the pedal
box: the brake lamp switch and the BPP switch.
The brake lamp switch only serves to switch on
the brake lamps. The BPP switch is used for engine
management purposes.
The BPP switch provides the PCM with the
information that the vehicle will be decelerated.
The BPP switch is closed in the rest state (brake
pedal not depressed) and sends a ground signal
to the PCM.
If when the APP sensor has failed, the BPP is
operated, the engine will be controlled to run at
idle speed by the PCM.
In order that the engine power output can be
matched to that required by the driver, the PCM
needs to know the position of the APP sensor.
The APP sensor is a variable resistor whose
resistance varies with the accelerator position. It
is a sliding contact potentiometer
(2 potentiometers
in total).
If a fault occurs in the APP sensor or the throttle
control unit (TCU) during vehicle operation, then
this will be
briefly indicated by a digital display in
the instrument cluster after the ignition is switched
on, and a trouble code will be stored in the PCM.
2006.0 Fiesta 1212006 G204204en
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303-1 4-9 Electronic Engine Controls 303-1 4-9
DESCRIPTION AND OPERATION
If one potentiometer fails, the engine will run with
reduced power (maximum torque
80 Nm), if both
potentiometers fail, the engine will run with reduced
power (maximum torque
55 Nm).
This warning may also be indicated if the engine
does not start. The cause may be a poor state of
charge of the battery.
The warning indication normally disappears once
the battery is re-charged.
2006.0 Fiesta 1212006 G204204en
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303-1 4-1 0 Electronic Engine Controls 303-1 4-1 0
DESCRIPTION AND OPERATION
Electronic Engine Controls - 2.OL Duratec-HE (M14)
System Overview, 2.OL Duratec HE (M14) Engine
--
2006.0 Fiesta 1212006 G422229en
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303-1 4-1 1 Electronic Engine Controls 303-1 4-1 I
DESCRIPTION AND OPERATION
Item Description Components
MAPT sensor
Manifold absolute pressure and
temperature (MAPT) sensor
1 2 1 Camshaft position (CMP) sensor I
1 3 1 Knock sensor (KS) I
vl~Ame%air temperature sensor I
1 5 1 Instrument cluster I
1 6 1 Battery I
1 7 1 Spark plug wires I
1 8 1 Exhaust gas recirculation (EGR) valve I
1 9 1 Fuel pump module I
1 10 1 Fuel rail and fuel injectors I
I 11 I Intake manifold tuning valve solenoid The
MAPT sensor is attached to the housing of the
intake manifold valve behind the throttle body. The
signal from the MAPT sensor is used to modify the
ignition and fuel delivery.
1 12 1 Accelerator pedal position (APP) sensor
1 13 1 Clutch pedal position (CPP) switch
1 14 1 Brake pedal position (BPP) switch
CMP sensor 1 15 1 Stoplamp switch
1 16 1 Power steering pressure (PSP) switch I
1 17 1 Catalyst monitor sensor I
FIGted oxygen sensor (H02S) I
1 19 1 Generator (input signal) I
1 20 1 Crankshaft position (CKP) sensor I
1 21 1 Engine coolant temperature (ECT) sensor I
22 Throttle position
(TP) sensor (part of
I I throttle body)
1 23 1 Powertrain control module (PCM) I The CMP sensor is located on the right-hand side
of the valve cover above the intake camshaft. The
CMP sensors send signals to the PCM which are
then used by the PCM to calculate the position of
the camshaft.
2006.0 Fiesta 1212006 G422229en
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303-1 4-1 2 Electronic Engine Controls 303-1 4-1 2
DESCRIPTION AND OPERATION
Powertrain control module (PCM) The KS detects engine vibrations caused by knock
and produces an output voltage signal in proportion
, to the knock. The PCM uses the voltage signal to(
control knock by retarding the ignition timing.
The powertrain control module is located within the
engine compartment below the battery and is
secured to the left-hand chassis rail by means of
a mounting bracket. On right-hand drive vehicles
the PCM is protected by a security shield which is
secured to the retaining bracket by a shear-head
bolt. In order to disconnect the PCM electrical
connectors it is necessary to remove the security
shield.
The PCM monitors and processes the signals from
the sensors and compares these with stored
parameters. The PCM uses this information to
calculate the output signals to the actuators.
Communications between the PCM and other
control units (for example, the stability assist and
the instrument cluster) including the DLC for
diagnosis of the system, take place on the
controller area network (CAN).
Intake manifold tuning valve solenoid
The solenoid for the intake manifold tuning system
is located on the transmission side of the cylinder
head.
Vacuum is supplied by a central vacuum
connection from the intake manifold.
The solenoid for the intake manifold tuning system
is supplied with either the maximum voltage or zero
voltage,
i.e. the valves are either fully open or fully
closed.
Actuation depends on the engine speed and the
engine load.
Diagnosis can be carried out through the DLC
using the Worldwide Diagnostic System (WDS)
BPP switch
diagnostic equipment.
Knock sensor (KS)
The BPP switch and the stoplamp switch are tt(r located on the pedal box and provide the PCM with
the information that the brake pedal has been
pressed and that the vehicle is therefore being
The knock sensor is located on the cylinder block decelerated.
between cylinders
2 and 3.
2006.0 Fiesta 1212006 G422229en
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