Ford Falcon. Manual — part 206
303-14-38
Powertrain Control Management
303-14-38
DESCRIPTION AND OPERATION (Continued)
Switch Specification
Connections
PCM Pin B16
. . . . . . …SCRSA
Switch
Voltage Range
Resistance (
±
(V)
5%
Ω)
PCM Pin B33
. . . . . . …SIGRTN
Default (none)
4.5 - 4.8
4,330
Circuit
RES COAST
4.0 - 4.3
1,630
SET +
3.2 - 3.8
810
SET -
2.1 - 3.0
420
CRUISE
0 - 0.4
0
Air Conditioner Inputs
Refer to Section 412-03.
Air Conditioner Demand
The Powertrain Control Module (PCM) controls
operation of the air conditioning compressor clutch.
When an Air Conditioner Demand (ACD) signal is
received by the PCM on the CAN, it energises the
ACR to engage the air conditioning compressor.
Failure Mode
Air Conditioner Relay
In the event the SCRSA fails, or the signal is outside
The Powertrain Control Module (PCM) energises the
the expected range, the PCM will log a fault code.
Air Conditioning Relay (ACR) whenever air
Some or all of the speed control functions will not be
conditioning is required. The air conditioning relay
available.
then energises the air conditioning compressor clutch.
Testing
Connections
The SCRSA is tested continuously during vehicle
PCM Pin B2. . . . . . . . . . .. ACR Signal
operation (CONT) and whenever a Key On Engine Off
(KOEO) test is performed.
Circuit
1. Connect a WDS tester to the diagnostic
connector.
2. Monitor the speed control switch status on the
WDS screen
3. Operate the speed control switches in sequence.
4. Check the Parameter Identification (PID) value for
each of the status as the button is pressed. If the
PID value is within specification, then check for
other Diagnostic Trouble Code (DTC) or
component faults
PID Specification
PID
Description
SCCS_NULL
Speed Control Range Switch in
“NULL” state
Diagnosis
SCCS_CANCEL Speed Control Range Switch
Diagnostic Trouble Codes (DTC) are retrieved through
“RESUME / CANCEL”
the diagnostic connector using the WDS tester. Fault
SC_ON
Speed Control Range Switch “ON
Finding Tables for DTCs are in the ‘Diagnosis’
/ OFF”
section.
SCCS_TAP_UP Speed Control Range Switch
DTCs applicable to the ACR relay are shown in the
“SET +”
following table.
SCCS_TAP_DN Speed Control Range Switch
“SET -”
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Powertrain Control Management
303-14-39
DESCRIPTION AND OPERATION (Continued)
DTC
Test Mode
Condition
DTC
Test Mode
Condition
P1465
KOEO, Cont.
Circuit malfunction
P0532
KOEO, Cont.
ACPT sensor circuit low
input
P1463
Cont.
Insufficient pressure
change when AC
P0533
KOEO, Cont.
ACPT sensor circuit high
compressor commanded
input
on.
P0534
Cont.
Air conditioning
refrigerant charge loss or
Testing
A/C system blockage
The AC relay is tested continuously during vehicle
P1463
Cont.
Insufficient pressure
operation (cont.) and whenever a Key On Engine Off
change when AC
(KOEO) test is performed.
compressor commanded
on.
Relay Test
Testing
1. Remove the AC relay from its socket in the
relay/fuse box adjacent to the battery.
The ACPT sensor is tested continuously during
vehicle operation (cont.) and whenever a Key On
2. Check the condition of the relay
Engine Off (KOEO) test is performed.
3. Check the harness for open circuits and short
1. Connect a WDS tester to the diagnostic
circuits.
connector.
Air Conditioner Pressure Transducer
2. Start and run the engine. Engage the
air-conditioning.
The Air Conditioner Pressure Transducer (ACPT)
sensor is located on the compressor discharge pipe.
3. Check the Parameter Identification (PID) value of
The Powertrain Control Module (PCM) uses this
the ACPT. If the PID value is within specification,
signal to monitor the air conditioner discharge
then check for other Diagnostic Trouble Codes
pressure and actuate the air conditioning and cooling
(DTC) or component faults.
strategies accordingly.
PID Specification
Connections
PID
Description
PCM Pin B15. . . . . . . . . .. ACPT Signal
ACP
A/C pressure
PCM Pin A36. .Vehicle Reference Voltage (VREF)
4. Check the harness for open circuits and short
PCM Pin A32. . . . . ..Signal Return (SIGRTN)
circuits.
Circuit
Transmission Inputs
Transmission Fluid Temperature Sensor
The Transmission Fluid Temperature (TFT) sensor is
located in a harness within the Automatic
Transmission oil pan. The TFT measures the
temperature of the oil in the automatic transmission
sump. The Powertrain Control Module (PCM) uses
the TFT signal to vary shift pressures in response to
the transmission oil temperature for consistent and
smooth shifts. It is also used to indicate transmission
overheat conditions.
The TFT sensor uses a thermistor that is sensitive to
temperature variations. The resistance of the
thermistor decreases as the temperature of the
transmission oil increases.
Diagnosis
Diagnostic Trouble Codes (DTC) are retrieved through
the diagnostic connector using the WDS tester. Fault
Finding Tables for DTCs are in the ‘Diagnosis’
section.
DTCs applicable to the ACPT sensor are shown in the
following table.
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Powertrain Control Management
303-14-40
DESCRIPTION AND OPERATION (Continued)
Connections
Output Actuators
PCM Pin A37. . . . . . . . . . . TFT Signal
Fuel Pump
PCM Pin A32. . . . . ..Signal Return (SIGRTN)
The Fuel Pump (FP) is powered by the fuel pump
Circuit
relay situated in the power distribution box on the right
hand side of the engine compartment. The PCM and
the PCM Power Relay control operation of the Fuel
Pump.
The fuel pump is a two-stage turbine pump. The first
stage is a low-pressure impeller pump. As it rotates,
the impeller draws fuel from the tank. Fuel is then
forced into the second high pressure stage. The
second stage is a gear type pump. As the inner gear
rotates, it carries fuel around with the rotor,
pressurising it and directing fuel into the outlet. This
two stage system eliminates vapour bubbles and
ensures the fuel is supplied at the correct pressure.
The large number of low volume chambers within the
gear pump produces smooth pressure characteristics
with minimal pressure pulsation resulting in quiet
operation.
Diagnosis
The fuel pump relay winding is supplied with power
DTCs applicable to the TFT sensor are shown in the
when the ignition is switched to the ON position. The
following table.
FP relay switches battery voltage to the Fuel Pump
when the coil is energised by the PCM Power Relay
DTC
Test Mode
Condition
and grounded by the PCM. When the ignition is first
P0712
KOEO, Cont.
TFT circuit low input
switched ON, the PCM will operate the fuel pump for
P0713
KOEO, Cont.
TFT circuit high input
one second. If no CKP signal is received at the PCM,
the PCM will open the ground circuit, switching OFF
Testing
the fuel pump relay. This ensures that if the engine
stalls, for any reason, fuel pump operation will cease
The TFT sensor is tested continuously during vehicle
immediately.
operation (cont.) and whenever a Key On Engine Off
(KOEO) test is performed.
Connections
Testing Engine Oil Temperature Sensor
PCM Pin B27. . . . . Fuel Pump Relay (FP)
1. Disconnect the Automatic transmission harness
Circuit
connector.
2. Locate the TFT sensor pins on the harness.
3. Using a suitable measure the resistance of the
TFT sensor. Replace the sensor if not within
specification.
TFT Specification
Temperature
Resistance
Voltage Nominal
(
±3º C.)
Nominal
10º
3800
Ω
4.0
20º
2500
Ω
3.5
30º
1700
Ω
3.1
40º
1200
Ω
2.7
60º
600
Ω
1.9
80º
320
Ω
1.2
Diagnosis
100º
190
Ω
0.8
120º
110
Ω
0.5
Diagnostic Trouble Codes (DTC) are retrieved through
the diagnostic connector using the WDS tester. Fault
4. Check the harness for open circuits and short
Finding Tables for DTCs are in the ‘Diagnosis’
circuits.
section.
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Powertrain Control Management
303-14-41
DESCRIPTION AND OPERATION (Continued)
DTCs applicable to the fuel pump relay are shown in
Fuel Injector Cross Section, Typical
the following table.
DTC
Test Mode
Condition
P0230
KOEO, Cont.
Relay primary circuit
malfunction
Failure Mode
If the Fuel Pump, Fuel Pump Relay or PCM Power
Relay fail, the fuel pump will not operate.
Testing
The fuel pump relay is tested continuously during
vehicle operation (cont.) and whenever a Key On
Engine Off (KOEO) test is performed.
1. Remove the relay from its socket in the relay/fuse
box adjacent to the battery.
2. Check the condition of the relay. Replace the
relay if faulty.
3. Check the harness for open circuits and short
circuits.
Fuel Injectors 1-8
The fuel injectors are electronically operated valves,
which deliver a metered amount of atomised fuel to
the engine. The injectors are conventional solenoid
operated injectors with a pintle type nozzle. The
injector orifice is a fixed size and the fuel supply
pressure to the injector is regulated by the fuel
pressure regulator. Fuel flow to the engine, and thus
the air-fuel ratio, is controlled by how long the injector
Item
Description
solenoid is energised. The Injector Pulse Width is the
time the solenoid is energised.
1
O-ring
Vehicles fitted with the I6 engine use 6 fuel injectors
2
Filter
(INJ1-6),while V8 engines have 8 injectors
3
Adjusting Sleeve
(INJ1-8),one for each cylinder.
4
Weld
5
Shells (2 of)
CAUTION: The fuel injectors pulse open
momentarily using a signal from the PCM.
6
Weld
Applying battery voltage directly to the fuel
7
Weld
injector’s electrical connector terminals will
8
Support Ring
damage the internal solenoid.
9
O-ring
Battery voltage is applied to the positive side of the
injector solenoid coil via the PCM Power Relay. The
10
Seat & Spray Plate Assy.
negative side of the injector solenoid is grounded, as
11
Tube Assy.
required, by the Powertrain Control Module (PCM).
12
Needle, Ball & Armature Assy.
The strategy the PCM uses to control the air-fuel ratio
13
Spring
is described in Control Systems.
14
Coil & Bobbin Assy.
15
Plastic Body
Connections (I6)
PCM Pin A14. . . . . . . . . Injector 1
PCM Pin A7. . . . . . . . ... Injector 2
PCM Pin A15. . . . . . . . . Injector 3
PCM Pin A4. . . . . . . . ... Injector 4
PCM Pin A8. . . . . . . . ... Injector 5
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