Ford Falcon. Manual — part 213

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Powertrain Control Management

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DESCRIPTION AND OPERATION (Continued)

range of some analogue sensors. The check tests for VSS Test

short or open circuit sensors and performs a range

The Vehicle Speed Sensor Test checks the Vehicle

test on each sensor to ensure it is within the expected Speed Sensor (VSS) signal and circuit.

operating range.

DTC P0500 is reported if the VSS sensor or its circuit

Range checks are only performed where the sensor

has malfunctioned.

or circuit passes the limit test.

Automatic Transmission Tests

The following sensor signal limits are checked during

the Analogue/Digital Limit Check and associated

The Auto Transmission Tests check the operation and

Diagnostic Trouble Codes (DTC) are reported if items circuit continuity of the Transmission Range Sensor

tested are not within specification. Note that the

(TRS-A1) <TRS>, (SS1-4, VPS, LUS and PCS).

VPWR test is designed to check continuity of the

DTC P0706 is reported if the TR signal is either out of

PCMs internal power circuit (IVPWR). VPWR does

range or demonstrates a performance problem. DTC

not test battery voltage.

P0753 is reported if SS1 or its circuit have failed.

Temperature and Manifold Absolute Pressure

DTC P0758 is reported if SS2 or its circuit have failed.

(T-MAP)

DTC P0763 is reported if SS3 or its circuit have failed.

Throttle Position Sensor (TP) <TPS>

DTC P0768 is reported if SS4 or its circuit have failed.

Air Conditioner Refrigerant Discharge

DTC P0748 is reported if Variable Pressure Solenoid

Temperature (ACRT)

5 (VPS) or its circuit have failed.

Transmission Fluid Temperature Sensor (TFT)

DTC P0778 is reported if Power Control Solenoid 6

<TOT>

(PCS) or its circuit have malfunction.

Transmission Range Sensor (TR) <TRS>

DTC P0743 is reported if the Lock Up Solenoid 7

Knock Sensor (KS)

(LUS) or its circuit have failed.

Vehicle Power (VPWR)

Solenoids Electrical Fault Logic

Air Conditioning System Tests

When a transmission solenoid electrical fault is

detected, the fault is latched:- remains set until next

Air Conditioning Compressor Integrity Failure

key-on event.

The Air Conditioning Compressor Integrity Failure test

Intermittent faults that do not trigger the latch

checks the status of the air conditioning compressor

mechanism are not reported.

clutch and reports a fault if the clutch does not

engage, the clutch slips or the compressor output is

Output Circuit Check

insufficient.

The Output Circuit Check tests some outputs for a

DTC P1463 is reported if there is insufficient pressure short or open circuit.

change in the air conditioning pressure sensor.

The following sensor signal limits are checked during

Air Conditioning Low Refrigerant Charge

the Output Circuit Check and associated Diagnostic

Trouble Codes (DTC) are reported if items tested are

The Air Conditioning Low Refrigerant Charge test

not within specification.

checks the air conditioning charge and reports a fault

where the charge is below the specific limit, or if there

Electro Drive Fan 1 (EDF1)

is an A/C system blockage.

Electro Drive Fan 2 (EDF2)

DTC P0534 is reported if there is an air conditioning

Fuel Pump (FP)

refrigerant charge loss or blockage.

Air Conditioning Request (ACR)
Evaporative Canister Purge Solenoid (EVAP)

COP Test

<CANP>

The COP Test checks the test checks the continuity of

Variable Cam Timing (VCT),

the ignition coil circuits and verifies if a coil has fired

since the test was last performed.

Intake Manifold Runner Control (IMRC) <BBM>
Fuel Injectors 1-8 (INJ1-8)

CMP Test

Each time the engine is re-started from cold the

The CMP Test checks the Camshaft Position Sensor

warm-up counter is incremented by one. If the fault

(Cylinder Identification) (CMP) <CID> signal and

causing fault the code is not present after 80 warm-up

circuit.

cycles, the code is erased from memory.

DTC P0340 is reported if the CMP sensor or its circuit

Fault Filter Calibration

have malfunctioned.

Each continuous fault code has a fault filter to avoid

DTC P0320 is reported if duration between CMP

setting a DTC for transient (seen only for a split

signal is greater than a specified value.

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Powertrain Control Management

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DESCRIPTION AND OPERATION (Continued)

second) error conditions. When a particular fault

All other on-demand tests are done with key on

occurs during operation the corresponding fault filter

engine running, and the vehicle stationary.

increments a background counter by one. For each

Key On Engine Off (KOEO) and Key On Engine

key-on event the code is not present, the counter is

Running (KOER) tests can only be run once during

reduced by one. If the counter reaches a specified

each key on event. The ignition key must be moved to

limit, then a DTC is logged. Continuous DTCs stay in

the OFF position before the tests can be re-initiated.

memory until cleared by Servicing Warm-up Counters

or manually using the (WDS) tester, or by resetting

Key On Engine Off (KOEO) test

the Keep Alive Memory (KAM).

NOTE: On manual transmission vehicles, the clutch

On-Demand Testing

pedal must be depressed during the whole test.

On-demand testing is initiated to diagnose faults or

The Key On Engine Off (KOEO) on-demand self-test

check operating conditions. On-demand Testing can

is a functional test of the powertrain control system.

only commence 4 seconds after the ignition key is

The test checks various sensors and circuits with the

moved to the ON position. Continuous testing does

ignition key in the ON position and the engine off:-not

not occur whenever on-demand tests are being

running. For a fault to be detected during this test the

performed.

fault must be present at the time the test is initiated or

running. Once a fault is detected a Diagnostic Trouble

When the Powertrain Control Module (PCM) detects a

Code (DTC)will be logged in the Powertrain Control

fault or malfunction a Diagnostic Trouble Code (DTC)

Modules (PCM)memory and output to the Diagnostic

is reported and stored in the PCMs Keep Alive

Link Connector (DLC) for retrieval by a Worldwide

Memory (KAM) memory. KAM has its own power

Diagnostic System (WDS) tester to the diagnostic

supply that retains the codes even after the ignition is

tool.

switched OFF. DTCs can be retrieved by the

Worldwide Diagnostic System (WDS) testing tool.

KOEO test is performed only once for each key on

event. The ignition must be switched to the ON

On-demand DTCs can be retrieved or cleared at any

position for at least 4 seconds; do not move the

time using the WDS, independently of continuous

ignition switch to the START position. When the

DTCs.

conditions for KOEO test initiation are met, and the

If an on-demand test is requested and conditions are

test has not already been performed during the

not correct for the test to run, a “conditions not

current key on session, the PCM performs the

correct” message is displayed on the WDS.

following tests:

On-demand test fault codes are only returned to the

PCM Processor and ROM/RAM Test

WDS tester if the test completes normally.

Analogue/Digital Limit and Range Check

On-demand tests exit the checking procedure under

the following conditions:

Vehicle State Check

The test completes normally or runs to completion

Electronic Immobilisation Check

without interruption unless:

Output Circuit Check

The test is aborted by the operator; “Cancel”

Engine Cooling Fans Check

command is issued from the WDS

PCM Processor and ROM/RAM test

The WDS test equipment is unplugged from the

vehicle before the test procedure is complete

PCM Processor and ROM/RAM Test checks the PCM

Central Processing Unit (CPU), Random Access

Operational or vehicle conditions change so that

Memory (RAM), Keep Alive [Memory] Power

conditions needed to continue the test are no

(KAPWR) and Read Only Memory (ROM) checksum.

longer met.

If any item fails the test, a Diagnostic Trouble Code

The time taken to run the test exceeds a pre-set

(DTC) is logged in memory and displayed on the

limit for the test.

Worldwide Diagnostic System (WDS) tester.

There are seven on-demand test modes. Each is

DTC P0603 is reported if the KAPWR has been reset

described in further detail in the following sections.

since the last key on event

Key On Engine Off (KOEO)

DTC P0605 is reported if the ROM checksum test fails

Key On Engine Running (KOER)

DTC P0606 is reported if either the CPU or RAM

Throttle Test

check fails

Ignition Timing Test

Analogue/Digital Check

Cylinder Contribution Test

The Analogue/Digital Limit Check tests the limits and

Output Test Mode (OTM)

range of some analogue sensors. The check tests for

LPG System Test, I6 engines, where fitted

short or open circuit sensors and performs a range

The KOEO and OTM tests are done with key on,

test on each sensor to ensure it is within the expected

engine off.

operating range. Range checks are only performed

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Powertrain Control Management

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DESCRIPTION AND OPERATION (Continued)

where the sensor or circuit passes the limit test. The

1. Turning the steering wheel to open the Power

following sensor signal limits are checked during the

Steering Pressure Switch (PSP) <PSPS>.

Analogue/Digital Limit Check and associated

2. Depressing the brake pedal.

Diagnostic Trouble Codes (DTC) are reported if items

Once a fault is detected a Diagnostic Trouble Code

tested are not within specification.

(DTC) will be logged in the Powertrain Control

Temperature and Manifold Absolute Pressure

Modules (PCM) memory and outputs it to the

(T-MAP)

Diagnostic Link Connector (DLC) for retrieval by a

Throttle Position Sensor (TP) <TPS>

Worldwide Diagnostic System (WDS) tester to the

diagnostic tool.

Air Conditioner Pressure Transducer (ACPT)

(ACRT)

KOER test is performed only once for each key on

event. The ignition must be switched to the ON

Transmission Fluid Temperature Sensor (TFT)

position for at least 4 seconds before a new test can

<TOT>

be initiated. The test is initiated by the WDS when the

Transmission Range Sensor (TR) <TRS>

vehicle stationary, engine running, transmission in

Vehicle Power (VPWR)

either Park or Neutral, as appropriate; and test has

not already been performed during the current key on

Vehicle State Check

session:

The Vehicle State Check tests that the Power

Initialisation

Steering Pressure (PSP)switch is not active, that no

Analogue/Digital Limit Check

Air Conditioner Demand (ACD) is present during

High/Low Idle Speed Test

KOEO, I6 engines, and for the Transmission Range

Sensor (TR) <PRNDL> (automatic transmission only)

Fuel Ramp Lean/Rich Test

is in either Park or Neutral.

Spark Advance Test

DTC P1650 is reported the PSP is active

PSPS Operated Check I6 engines

DTC P1705 is reported if the TR is in any position

Initialisation

other than Park or Neutral

The Initialisation phase prepares the vehicle for

Output Circuit Check

KOER test by switching off Evaporative Canister

The Output Circuit Check tests some outputs for a

Purge Solenoid (EVAP) <CANP>, switching off any

short or open circuit. The outputs are turned off before Air Conditioner Demand (ACD)Spark advance

the check; each output is then switched on in turn for

feedback is normally enabled during KOER testing,

50 milliseconds during the test.

except during the Spark Advance, Ignition Timing and

Cylinder Contribution tests. During these tests spark

The following sensor signal limits are checked during

advance feedback is disabled and the timing is fixed.

the Output Circuit Check and associated Diagnostic

Trouble Codes (DTC) are reported if items tested are

Analogue/Digital Limit Check

not within specification.

The Analogue/Digital Limit Check tests the limits and

Electro Drive Fan 1 (EDF1)

range of some analogue sensors that are not covered

Electro Drive Fan 2 (EDF2)

by Key On Engine Off test. The check tests for short

Fuel Pump (FP)

or open circuit sensors and performs a range test on

each sensor to ensure it is within the expected range

Air Conditioning Request (ACR)

under actual engine operating conditions. Range

Evaporative Canister Purge Solenoid (EVAP)

checks are only performed where the sensor or circuit

<CANP>

passes the limit test.

Variable Cam Timing (VCT)

The following sensor signal limits are checked during

Intake Manifold Runner Control (IMRC) <BBM>.

the Analogue/Digital Limit Check and associated

Diagnostic Trouble Codes (DTC) are reported if items

Key On Engine Running (KOER) test

tested are not within specification.

The Key On Engine Running (KOER) on-demand

The Cylinder Head temperature Sensor (CHT)

self-test is a functional test performed with the engine

Temperature and Manifold Absolute Pressure

operating in normal conditions and temperatures. The

(T-MAP)

test checks various sensors and circuits with the

ignition key in the ON position and the engine

Throttle Position Sensor (TP) <TPS>

on:-running. For a fault to be detected during this test

High/Low Idle Speed Test

the fault must be present at the time the test is

initiated or running. This test calls for some operator

The High/Low Idle Speed Test checks that the

intervention to test additional sensor information. This Electronic Throttle Control (ETC) can properly control

includes

the idle speed. The test increases then decreases the

idle speed and measures the change in engine speed.

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Powertrain Control Management

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DESCRIPTION AND OPERATION (Continued)

DTC P0507 is reported if the idle speed is higher than table.

the expected low idle speed

Output Test Mode States

DTC P0506 is reported if the idle speed is lower than

the expected high idle speed

State Description
All On The following outputs are switched on (engine

Fuel Ramp Lean/Rich Test

cooling fans off): Air Conditioning Clutch Relay (ACR),

The Fuel Ramp Lean/Rich Test varies the Fuel

evaporative Emission Canister Purge (EVAP), Starter

Injector Pulse Width and measures the Heated

Relay (START), Fuel Pump (FP) relay, Intake

Exhaust Gas Oxygen Sensors (HEGO) signal to

Manifold Charge Control (IMCC) and Variable Cam

detect if the Powertrain Control Module (PCM) can

Timing (VCT)* All Off The outputs listed above, and

successfully control the air fuel ratio between lean and engine cooling fans, are switched off.

rich.

Fans Low The engine cooling fans (EDF1-2) are

If DTC P0131 or P0151, V8 engine, HEGO sensor

switched on at low speed; all other outputs above

short circuit is already set, the Fuel Ramp Lean/Rich

switched off. Fans High The engine cooling fans

Test will not be performed.

(EDF1-2) are switched on at high speed; all other

outputs above switched off.

I6 Engines
DTC P0172 is reported if the air fuel ratio is too rich

LPG System Test

during the lean phase of the test

The LPG System Test checks the operation of the

DTC P0171 is reported if the air fuel ratio is too lean

complete LPG fuel control system on vehicles with

during the rich phase of the test

Ford Factory Fitted LPG systems.

The PCM uses the Heated Exhaust Gas Oxygen

V8 Engines

Sensor (HEGO) signal to detect that a change in the

DTC P0172 is reported if the air fuel ratio is too rich

air fuel ratio occurs when the LPG stepper motor is

on cylinder bank 1 during the lean phase of the test

actuated. The LPG stepper motor is ramped lean and

then rich to force a change in the HEGO output. The

DTC P0175 is reported if the air fuel ratio is too rich

test will fail if the system fails to switch either lean or

on cylinder bank 2 during the lean phase of the test

rich within a set time or if the RPM drops below its

DTC P0171 is reported if the air fuel ratio is too lean

predefined limits. A failure in this test can be caused

on cylinder bank 1 during the rich phase of the test

by faulty stepper motor, wiring, PCM, HEGO sensor

DTC P0174 is reported if the air fuel ratio is too lean

or LPG converter.

on cylinder bank 2 during the rich phase of the test

Code P1159 is reports a fuel stepper motor

Power Steering Pressure Switch Operated

malfunction if the air fuel ratio cannot be changed by

the PCM during the test.

Check

A requirement of KOER test is that the test operator

Ignition Test

moves the steering wheel to either left or right hand

The Ignition Test sets the ignition spark advance to a

extreme lock to operate the Power Steering Pressure

fixed value so that ignition timing can be manually

Switch (PSP) <PSPS>.

checked using a timing light. Fixed timing mode stays

The PCM checks that the power steering pressure

in effect for 2 minutes or less if cancelled from the

switch changes state during the KOER test.

WDS. Fixed timing can be performed more than once

during the same Key On Engine Running (KOER) test

DTC P1651 is reported if the PSP does not change

session.

state during the test.

No fault codes are reported from the ignition test.

Output Test Mode
The Output Test Mode (OTM), No. 84, allows some

Parameter Identification

Powertrain Control Module (PCM) outputs to be

A Parameter Identification (PID) represents an internal

switched on and off manually using the Worldwide

Powertrain Control Module (PCM) parameter. PIDs

Diagnostic System (WDS) tester. Either an audible

accessed using the Worldwide Diagnostic System

sound or visually verification of a device can confirm

(WDS) tester are displayed as parameter names with

its operation. The OTM may be performed more than

operating values of analogue and digital

once during a KOEO event. TM can only be entered

inputs/outputs, calculated values and system status

with the key in the ON position and the engine off:-not

information.

running. There are no fault codes reported following

The WDS PID data monitor and record data function

this test. The test will time out and abort if the test

can display values and data dynamically during

time in any one state exceeds a specified limit.

normal running and can also record the data for

Once OTM has been entered, there are 4 states that

detailed diagnosis.

can be manually selected, as shown in the following

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