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 -”

G98131 en

303-14-39 

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.

G98133 en

303-14-40 

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.

G98133 en

303-14-41 

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

G98133 en