Ford Falcon. Manual — part 313

412-03-25 Air

Conditioning 412-03-25

DIAGNOSIS AND TESTING (Continued)

Acronym

Description

Acronym

Description

VS

Vehicle Speed (MPH)

OFF

OFF (ACC)

CHT

Cylinder Head Temperature

ACC_POS

ACC Position

from HIM

TMPKNOBP

Temperature Selector Status

ACCS

A/C Compressor Cycling

BLWR_FAN

Blower Fan Speed

Request

AC_SEL_SW

Air Conditioning Switch Status

A_CT

Evaporator Temperature

RECIRC

Recirculation Status

ETSFD

External Temperature Sensor

MODE_SW

Mode Switch

Filtered Data (Ambient

from BEM

Temperature)

AC_SUNSEN

A/C Sunload Sensor Status

EXT_TEMP

External Temperature From

INT_TEMP

Interior Temperature Sensor

Sensor (unfiltered) (Ambient

Temperature)

from Instrument Cluster

BLOWVOL

HVAC Blower Voltage

VEH_SPD

Vehicle Speed

BLOWAP

Blower Motor Speed - Actual

VBATT_VAL

System Battery Voltage Value

Position

WDS Diagnostic Trouble Code (DTC)

BLOWTP

Blower Motor Speed - Target

Position

chart

LEFTOT

Passenger’s Display Set

Special Tool(s)

Temperature

WDS Workshop Diagnostic

RIGHTOT

Driver’s Display Set

System

Temperature

MC_VREF

Vehicle Battery Voltage

RECIRDS

Recirculation Door Actual

Position

RECIRCDTP

Recirculation Door Target

Position

The following chart lists all DTC’s relevant to the A/C

CCMODE

Climate Control Mode

system that may be set due to operation failures. The

codes may be set due to either intermittent or

from ICC

permanent failures.

AUTO

AUTO (ACC)

WDS Display

Fault Description

Possible Cause

from EEC/PCM
P0532

A/C Refrigerant Pressure Sensor A

Checked at key on, engine off and

Circuit Low Input

continuously when A/C on

Pressure sensor out of calibration,

open-circuit

P0533

A/C Refrigerant Pressure Sensor A

Checked at key on, engine off and

Circuit High Input

continuously when A/C on

Pressure sensor out of calibration,

short-circuit

P1463

A/C Pressure Sensor insufficient

Slipping compressor clutch

pressure change

Poor compressor performance

Low A/C refrigerant charge

P1474

Fan Control primary circuit

Low Speed Engine Cooling Fan circuit

fault

Cooling fan fault

P1479

High Fan Control primary circuit

High Speed Engine Cooling Fan

circuit fault

cooling fan fault

P0534

A/C Refrigerant Charge Loss

Checked continuously when A/C on:

Low A/C refrigerant charge or A/C

System blockage

G73303 en

412-03-26 Air

Conditioning 412-03-26

DIAGNOSIS AND TESTING (Continued)

WDS Display

Fault Description

Possible Cause

P1465

A/C relay circuit

WAC Relay fault

relay wiring circuit fault

P1270

Engine RPM or Vehicle Speed limiter

Refer to A/C disable strategy list in this

reached

section.

P1285

Cylinder Head over-temperature

Engine overheating fault

P1299

condition, protection active

Refer to A/C disable strategy list in this

section.

U1900/P1796

CAN communication bus fault

HIM/CAN/BEM/circuit to EEC/PCM fault

from HIM
B2014

Climate Control A/C Post-Evaporator

Sensor leads disconnected from HIM

Sensor open circuit

sensor failure

HIM failure

B1947

Climate Control A/C Post-Evaporator

Sensor leads shorted together

Sensor short to ground

sensor failure

HIM failure

B2513

Blower (Fan) circuit failure

HVAC air flow restriction

HIM failure

B2006

Blower Motor Switch out of range

Invalid data code sent by vehicle

sub-system

B2005

Climate Control Temperature Switch out Invalid data code sent by vehicle

of range

sub-system

B1255

Air temperature external sensor circuit

Sensor lead disconnected from module

open

Sensor failure

Internal module failure (HIM)

B1257

Air temperature external sensor circuit

Sensor leads shorted together

short to ground

Sensor leads shorted to vehicle body

Sensor failure

Internal module failure (HIM)

U2196

Invalid ‘Engine RPM’ data

Invalid data code sent by vehicle

sub-system

U2197

Invalid ‘Vehicle Speed’ data

Invalid data code sent by vehicle

sub-system

U2199

Invalid ‘Engine Coolant Temperature’

Invalid data code sent by vehicle

data

sub-system

B2007

(Driver/Passenger) Solar radiation

Sun load sensor faulty, out of calbration

B2890

Sensor out of range

from ICC
B1318

Battery voltage low

Low system voltage detected.

Battery or alternator fault.

B2923

Climate control button stuck

Climate control button jammed

U2201

Ambient temperature data invalid

HIM did not have valid ambient

temperature data output

from BEM
B1250

Air temperature internal (cabin) sensor

Cabin temperature sensor failure

circuit failure

B1251

Air temperature internal (cabin) sensor

Cabin temperature sensor wiring fault,

circuit open

open circuit

B1253

Air temperature internal (cabin) sensor

Cabin temperature sensor wiring fault,

circuit short to ground

short-circuit

B1259

Solar radiation sensor circuit open

Sun load sensor wiring fault, open circuit

B1261

Solar radiation sensor circuit short to

Sun load sensor wiring fault, short-circuit

ground

G73303 en

412-03-27 Air

Conditioning 412-03-27

DIAGNOSIS AND TESTING (Continued)

A/C disable strategy chart

The following chart lists the conditions under which the A/C System is disabled to prevent compressor

operation, either temporarily or permanently. The A/C System may be disabled temporarily to pretect the

compressor until conditions are suitable for operation, on permanently until a fault is rectified.

DTC Code

A/C is Disabled under the following conditions

N/A - (temporary A/C

A/C is disabled when the A/C pressure transducer (ACPT) exceeds the

disengagement only)

maximum allowed pressure, and is re-engaged when the ACPT output drops

back down to an acceptable pressure (eg. may occur in extremely high ambient,

high vehicle speed conditions)

N/A - (temporary A/C

A/C is disabled when the A/C pressure transducer (ACPT) drops below the

disengagement only)

minimum allowed pressure, and is re-engaged when the ACPT output rises up

to an acceptable pressure (eg. may occur in extremely low ambient

temperatures)

P0532,P0533

A/C is disabled when the ACPT output is out of range (circuit or calibration fault)

P1463

A/C is disabled when the ACPT pressure rise after A/C clutch engagement is

less than the minimum allowed and is re-engaged when the engine speed drops

back down to a lower rpm. ( This may indicate clutch slip, low A/C charge or

faulty compressor)

P0534

A/C is disabled when the A/C performance is not acceptable for given ambient

temperature and vehicle operating conditions

P0534

A/C is disabled when the A/C gas charge level is too low during A/C operation

P0534

A/C is disabled when the A/C gas charge level drops during A/C operation

N/A - (temporary A/C

A/C is disabled when the engine speed is greater than the maximum allowed for

disengagement only)

a given vehicle speed, and continues to be disabled when the engine speed is

greater than the maximum allowed for A/C re-engagement

P1270

A/C is disabled when the engine speed is more than the maximum allowed for

A/C operation (close to red-line rpm), and continues to be disabled when the

engine speed is greater than the maximum allowed for A/C re-engagement

N/A - (temporary A/C

A/C is disabled when the engine speed is less than the minimum allowed for

disengagement only)

A/C operation (below idle rpm)

U1900

A/C is disabled when the HIM CAN link is missing

N/A - (temporary A/C

A/C is disabled at the first A/C engagement after a new or reflashed PCM, if the

disengagement only)

A/C is engaged at too high an engine speed

P1299

A/C is disabled just before the engine cylinder head temperature exceeds a

maximum allowable temperature and the cylinder head protection is activated

G73303 en

412-03-28 Air

Conditioning 412-03-28

DIAGNOSIS AND TESTING (Continued)

Simplified Air Conditioning Electrical Circuit

NOTE: For more information, refer to complete Air

Conditioning Control Circuit in Wiring section.

Connector Circuit Reference

C-121 (A/C Compressor)

Pin Number(s)

Circuit Designation/Description

Normal Condition/Measurement

1

Circuit 347A B-Y

12V when A/C on

Power

2

Circuit 57A B

Earth (less then 5 Ohms to chassis ground)

Ground

G73303 en