refrigerant type SUZUKI SX4 2006 1.G Service Service Manual

Downloaded from www.Manualslib.com manuals search engine 7B-48 Air Conditioning System: Automatic Type
Cool air does not come
out or insufficient cooling
(A/C compressor normal
operation)Insufficient or excessive charge of
refrigerantCheck the amount of refrigerant and system
for leaks.
Condenser cloggedCheck condenser referring to “Condenser
Assembly On-Vehicle Inspection”.
A/C evaporator clogged or frostedCheck A/C evaporator and evaporator
temperature sensor referring to “Evaporator
Inspection” and “Evaporator Temperature
Sensor Inspection”.
Evaporator temperature sensor faultyCheck evaporator temperature sensor
referring to “Evaporator Temperature Sensor
Inspection”.
Expansion valve faultyCheck expansion valve referring to “Expansion
Valve Inspection”.
Desiccant cloggedCheck desiccant and cap with filter.
Compressor drive belt loosened or
brokenAdjust or replace drive belt.
Magnet clutch faultyCheck magnet clutch referring to “Magnet
Clutch Inspection”.
Compressor faultyCheck compressor.
Air in A/C systemReplace condenser, and then perform
evacuation and charge referring to “Operation
Procedure for Refrigerant Charge”.
Air leaking from HVAC unit or air ductRepair as necessary.
Heater and ventilation system faultyCheck HVAC unit.
HVAC control module faultyCheck HVAC control module referring to
“Inspection of HVAC Control Module and Its
Circuit”.
Temperature control actuator faultyCheck temperature control actuator referring to
“Temperature Control Actuator and Its Circuit
Inspection”.
Blower motor faultyCheck blower motor referring to “Blower Motor
Inspection in Section 7A”.
Excessive compressor oil in A/C systemDrain excessive compressor oil from A/C
system circuit and compressor.
Cool air does not come
out only intermittentlyWiring connection faultyRepair as necessary.
Expansion valve faultyCheck expansion valve referring to “Expansion
Valve Inspection”.
Excessive moisture in A/C systemReplace condenser, and then perform
evacuation and charge referring to “Operation
Procedure for Refrigerant Charge”.
Magnet clutch faultyCheck magnet clutch referring to “Magnet
Clutch Inspection”.
Excessive amount of refrigerantCheck the amount of refrigerant.
Cool air comes out only at
high speedCondenser cloggedCheck condenser referring to “Condenser
Assembly On-Vehicle Inspection”.
Insufficient charge of refrigerantCheck the amount of refrigerant and system
for leaks.
Air in A/C systemReplace condenser, and then perform
evacuation and charge referring to “Operation
Procedure for Refrigerant Charge”.
Compressor drive belt loosened or
brokenAdjust or replace drive belt.
Compressor faultyCheck compressor.
Cool air does not come
out only at high speedExcessive amount of refrigerantCheck the amount of refrigerant.
A/C evaporator frostedCheck A/C evaporator and evaporator
temperature sensor referring to “Evaporator
Inspection” and “Evaporator Temperature
Sensor Inspection”. Condition Possible cause Correction / Reference Item

Downloaded from www.Manualslib.com manuals search engine Air Conditioning System: Automatic Type 7B-53
) B1521Blower Speed
Selector
Malfunction16 1Signal voltage of blower speed selector in HVAC
control module is higher than specification.Flashed
16 2Signal voltage of blower speed selector in HVAC
control module is lower than specification.Flashed
) B1522Air Flow Selector
Malfunction17 1Signal voltage of airflow selector in HVAC control
module is higher than specification.Flashed
17 2Signal voltage of airflow selector in HVAC control
module is lower than specification.Flashed
) B1541Back-up Power
Supply Circuit
Malfunction14 1• Back-up power supply voltage of HVAC control
module is higher than or lower than
specification.
• When connect battery with vehicle and then,
turn ignition switch to ON position for first time.—
) B1546A/C Refrigerant
Pressure
Malfunction13 5• Signal voltage of outside air temperature sensor
is more than specified value. However, A/C
refrigerant pressure is less than specified value.
• Insufficient refrigerant in A/C system.—
) B1551Serial
Communication
Circuit
Malfunction91Circuit voltage of serial communication circuit is
higher than specification.Flashed
92Circuit voltage of serial communication circuit is
lower than specification.Flashed
) B1552HVAC Control
Module Check
Sum Error94HVAC control module received unspecified data
from BCM more than 8 times.Flashed
) B1553CAN
Communication
Circuit
Malfunction10 4HVAC control module received signal indicating
reception error from ECM.Flashed
) B1557VSS Signal
Failure11 4HVAC control module receives invalid data of VSS
signal from BCM.—
) B1561ECT signal
Failure54HVAC control module receives invalid data of ECT
signal from BCM.Flashed
) B1562Outside
Temperature
Sensor Signal
Failure14HVAC control module receives invalid data of
outside air temperature sensor signal from BCM.Flashed
) B1563A/C Refrigerant
Pressure Sensor
Signal Failure13 4HVAC control module receives invalid data of A/C
refrigerant pressure sensor signal from BCM.—
) B1570Engine Type
Signal Failure20 4HVAC control module receives invalid data of
engine type signal from BCM.—
) B1571Combination
Meter Spec
Signal Failure21 4HVAC control module receives invalid data of
combination meter spec signal from BCM.—
NO CODE Normal See NOTE below — —DTC No.
(displayed
on SUZUKI
scan tool)Detection itemDTC (indicated on
HVAC control
module)
Condition when trouble detected (DTC is
determined when following condition detected)“A/C”
indicator
light Indicated
by “REC”
indicator
lightIndicated
by “FRE”
indicator
light

Downloaded from www.Manualslib.com manuals search engine 7B-54 Air Conditioning System: Automatic Type
DTC of A/C System detected by ECM
NOTE
When no DTC is detected, “FRE” [A] and “REC” [B] indicator lights on HVAC control module flash at
the same time in specific pattern.

Fail-Safe TableS6RW0D7224007
When any of the following malfunctions (DTCs) is detected, fail-safe mode is activated.
However, when HVAC control module detects normal operation of A/C system, fail-safe mode is canceled. DTC No. Detection itemDetecting condition
(DTC will set when detecting)MIL
P0481 Fan 2 Control Circuit
Refer to “Fail-Safe Table in Section 1A”. P0532A/C Refrigerant Pressure
Sensor Circuit Low
P0533A/C Refrigerant Pressure
Sensor Circuit High
H: ON a. About 3 seconds
L: OFF b. About 1 seconds
DTC No. Trouble AreaFail-Safe Operation
When ignition switch is turned ON
after malfunction is already detectedWhen malfunction is detected during
ignition switch is ON
) B1502Inside air temperature
sensor circuitHVAC control module maintains last
normal value.HVAC control module controls actuators
assuming that inside air temperature is
25 °C (77 °F).
) B1503A/C evaporator
temperature sensor
circuitHVAC control module assuming that
evaporator temperature is 0 °C (32 °F).• HVAC control module turns off A/C
switch signal.
• HVAC control module controls
actuators assuming that evaporator
temperature is 0 °C (32 °F).
) B1504 Sunload sensor circuitHVAC control module maintains last
normal value.HVAC control module controls actuators
assuming that amount of sunlight is 0 W/
m
2.
) B1520Temperature selector
malfunctionHVAC control module maintains last
normal value.HVAC control module controls actuators
assuming that setting of temperature
selector is 25 °C (77 °F) position.
) B1521Blower speed selector
malfunctionHVAC control module maintains last
normal value.HVAC control module controls actuators
assuming that setting of blower speed
selector is low (1st) position.
) B1522Air flow selector
malfunctionHVAC control module maintains last
normal value.HVAC control module controls actuators
assuming that setting of air flow selector
is DEF position.
[A]
[A]H
L
H
L [B]
[B]
baaba
baaba
I5RW0A722008-01

Downloaded from www.Manualslib.com manuals search engine 7B-56 Air Conditioning System: Automatic Type
Scan Tool Data Definitions
TEMP CONT SWITCH: (Temperature control selector
position, Max Cool, °C / °F, Max Hot): This
parameter indicates the selected position of
temperature control selector.
CABIN TEMPERATURE: (In-car temperature, °C, °F):
This parameter indicates the in-car temperature
detected by inside air temperature sensor.OUTSIDE AIR TEMP (Outside air temperature, °C,
°F): This parameter indicates the outside air
temperature detected by outside air temperature
sensor.
EVAPORATOR TEMP (Evaporator temperature, °C,
°F): This parameter indicates the temperature of air
passed through evaporator.
COOLANT TEMP (Engine Coolant Temperature °C,
°F): This parameter indicates the engine coolant
temperature detected by engine coolant temperature
sensor. ) COOLANT TEMP
Ignition switch turned ONEngine coolant temperature is
displayed
) SUN LOAD Reference value depends on the situation 0 W/m
2 – 1988 W/m2
)MODE CONT
SWITCHIgnition switch turned ON and air flow selector at
AUTO positionAUTO (Selected position of air flow
selector is displayed)
) FAN CONT SWITCHIgnition switch turned ON and blower speed selector
at AUTO positionAUTO (Selected position of blower
speed selector is displayed)
) FAN DESIRED VOLTIgnition switch turned ON and blower speed selector
at HighApprox. 12.0 V
Ignition switch turned ON and blower speed selector
at LowApprox. 4.0 V
) AIR MIX POS SENIgnition switch turned ON and temperature selector
at maximum cool positionApprox. 0.5 V
Ignition switch turned ON and temperature selector
at maximum hot positionApprox. 4.5 V
)MODE POS SENSORIgnition switch turned ON and air flow selector at
DEF positionApprox. 4.5 V
Ignition switch turned ON and air flow selector at
VENT positionApprox. 0.5 V
) A/C CONT SIGA/C switch turned ON, blower speed selector at other
than OFF position with engine runningON
A/C switch turned OFF with engine running OFF
) BLOWER LOAD SIGIgnition switch turned ON, blower speed selector at
other than OFF positionON
Ignition switch turned ON, blower speed selector at
OFF positionOFF
) AIR INTAKE MODEIgnition switch turned ON and air intake selector at
fresh air (FRE) positionFRE
Ignition switch turned ON and air intake selector at
recirculation air (REC) positionREC
Ignition switch turned ON, air flow selector and
blower speed selector at AUTO positionAUTO
) REFRIGERANT
PRESSUREA/C ON (A/C is operating) with engine running at
ambient temperature 30 °C (86 °F)1130 – 1560 kPa (For details, refer to
pressure of high pressure gauge
under “A/C System Performance
Inspection”)
A/C OFF (A/C is not operating) with engine running
at ambient temperature 30 °C (86 °F) and engine
coolant temperature 90 °C (194 °F) – 100 °C (212
°F)600 – 1000 kPa after longer than 10
minute for A/C switch turned off
) A/C COMP CLUTCHA/C switch turned ON, blower speed selector at other
than OFF position with engine runningON
A/C switch turned OFF with engine running OFF
) VEHICLE SPEED At stop with ignition switch turned ON 0 km/h (0 mph)
) ENGINE TYPE Ignition switch turned ON Engine type is displayed.
) METER SPEC Ignition switch turned ONCombination meter spec is displayed. Scan Tool Data ConditionNormal Condition / Reference
Va l u e

Downloaded from www.Manualslib.com manuals search engine Air Conditioning System: Automatic Type 7B-57
SUN LOAD (W/m2): This parameter indicates the
amount of sunlight detected by sunload sensor.
MODE CONT SWITCH (Air flow selector position,
AUTO, FACE, B/L, FOOT, D/F, DEF): This
parameter indicates the selected position of air flow
selector.
FAN CONT SWITCH (Blower speed selector, AUTO,
OFF, 1st – 8th): This parameter indicates the
selected position of blower speed selector.
FAN DESIRE VOLT (Fan desired voltage, V): This
parameter indicates the consumption voltage of
blower motor.
AIR MIX POS SENSOR (Temperature control
actuator position sensor, V): This parameter
indicates the input signal from position sensor in
temperature control actuator.
MODE POS SENSOR (Air flow control actuator
position sensor, V): This parameter indicates the
input signal from position sensor in air flow control
actuator.
A/C CONT SIG (A/C control signal, ON, OFF): This
parameter indicates the state of A/C switch.BLOWER LOAD SIG (Blower fan load signal, ON,
OFF): ON: Position of blower speed selector is 1st
position or more.
OFF: Position of blower speed selector is OFF
position.
AIR INTAKE MODE (Air intake selector position,
AUTO, FRE, REC): This parameter indicates the
selected position of air intake selector.
REFRIGERANT PRESSURE (A/C refrigerant absolute
pressure, kPa): This parameter indicates the A/C
refrigerant absolute pressure calculated by ECM
A/C COMP CLUCH (A/C compressor magnet clutch,
ON, OFF): This parameter indicates the state of the
A/C compressor magnet clutch.
VEHICLE SPEED (km/h, mph): This parameter
indicates the vehicle speed calculated by ECM.
ENGINE TYPE (Engine type signal, J20, M16 or
M15): This parameter indicates the engine type
signal transmitted by ECM.
METER SPEC (Combination meter spec signal, EU,
UK, US, Canada, DOM): This parameter indicates
the combination meter spec signal transmitted by
combination meter.
Visual InspectionS6RW0D7224009
Check visually the following parts and systems.
DTC B1502: Inside Air Temperature Sensor Circuit MalfunctionS6RW0D7224010
Wiring DiagramInspection item Correction
• Refrigerant leakage and amount
• A/C pipe or hose disconnection,
looseness and
deterioration
• A/C compressor drive belt looseness and damageRefer to “Compressor Drive Belt Inspection
and Adjustment”.
• Battery fluid level and corrosion
of terminal
• Connectors of electric wire harness disconnection and
friction
• Fuses burning
• Parts installation and damage
• Other parts that can be checked visually
5V
G20
1 2 3 4 5 6 7 8 9 10 11 12 13 14
15 16 17 18 19 20 21 24 23 22 25 26 27 28 29 30
ORNORNPNK/BLKG20-10
21
3 [S]
[G]
G20-24
I7RW01722004-01
[S]: Inside air temperature sensor signal circuit 1. HVAC control module 3. To other sensors
[G]: Inside air temperature sensor ground circuit 2. Inside air temperature sensor

Downloaded from www.Manualslib.com manuals search engine 7B-70 Air Conditioning System: Automatic Type
DTC B1546: A/C Refrigerant Pressure MalfunctionS6RW0D7224019
DTC Detecting Condition and Trouble Area
DTC Troubleshooting
DTC B1551: Serial Communication Circuit MalfunctionS6RW0D7224020
Wiring DiagramDTC detecting condition Trouble area
• A/C refrigerant pressure sensor signal voltage is lower than specified value
even though outside air temperature is higher than specified value for
specified time continuously.
• Insufficient refrigerant in A/C system• Insufficient of refrigerant
• A/C refrigerant pressure sensor
• Outside air temperature sensor
• HVAC control module
Step Action Yes No
1Was “Air Conditioning System Check” performed?Go to Step 2. Go to “Air Conditioning
System Check”.
2DTC check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Turn ignition switch to ON position and check DTC in
BCM.
Is DTC B1141 or B1142 (BCM) detected?Go to applicable DTC
diag. flow.Go to Step 3.
3DTC check
Check DTC in ECM.
Is DTC P0532 or P0533 detected?Go to applicable DTC
diag. flow.Go to Step 4.
4A/C refrigerant pressure and outside air temperature
data check
1) Start engine and select “DATA LIST” mode on scan tool.
2) Check “Refrigerant Pressure” and “Outside Air Temp”
displayed on scan tool.
Are values of A/C refrigerant pressure sensor and outside air
temperature within specified ranges indicated in “Scan Tool
Data”?Substitute a known-
good HVAC control
module and recheck.Check the amount of
refrigerant and system
for leaks.
12V
G20
G20-13YEL
1 2 3 4 5 6 7 8 9 10 11 12 13 14
15 16 17 18 19 20 21 24 23 22 25 26 27 28 29 30
1
2 3
[S]WHT/REDWHTG20-7
12V5V
[B]4 4
I7RW01722012-02
[B]: Back-up power supply circuit 1. HVAC control module 3. Information display
[S]: Serial communication circuit 2. BCM 4. Circuit fuse

Downloaded from www.Manualslib.com manuals search engine 7B-72 Air Conditioning System: Automatic Type
DTC B1552: HVAC Control Module Check Sum ErrorS6RW0D7224021
DTC Detecting Condition and Trouble Area
DTC Troubleshooting
DTC B1553: CAN Communication Circuit MalfunctionS6RW0D7224022
DTC Detecting Condition and Trouble Area
DTC TroubleshootingDTC detecting condition Trouble area
Data received by HVAC control module from BCM is erroneous continuously. • BCM
• HVAC control module
Step Action Yes No
1Was “Air Conditioning System Check” performed?Go to Step 2. Go to “Air Conditioning
System Check”.
2Serial communication signal data check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Start engine and select “DATA LIST” mode on scan tool.
3) Check “Refrigerant Pressure”, “Vehicle Speed”, “Coolant
Temp” and “Outside Air Temp” displayed on scan tool.
Are values of A/C refrigerant pressure sensor and outside air
temperature within specified ranges indicated in “Scan Tool
Data”?Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section
00”Substitute a known-
good HVAC control
module and recheck.
If DTC is still detected
substitute a known-
good BCM and recheck.
DTC detecting condition Trouble area
HVAC control module receives error code from BCM continuously. • CAN communication circuit
•BCM
•ECM
• Combination meter
• HVAC control module
Step Action Yes No
1Was “Air Conditioning System Check” performed?Go to Step 2. Go to “Air Conditioning
System Check”.
2DTC check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Check DTC in BCM.
Is DTC U0073 (No.0073), U0100 (No.0100) and/or U0155
(No.0155) detected?Go to applicable DTC
diag. flow.Substitute a known-
good HVAC control
module and recheck.

Downloaded from www.Manualslib.com manuals search engine 7B-74 Air Conditioning System: Automatic Type
DTC B1562: Outside Air Temperature Signal FailureS6RW0D7224025
DTC Detecting Condition and Trouble Area
DTC Troubleshooting
DTC B1563: A/C Refrigerant Pressure Signal FailureS6RW0D7224026
DTC Detecting Condition and Trouble Area
DTC TroubleshootingDTC detecting condition Trouble area
HVAC control module receives invalid data of outside air temperature signal
from BCM.• Outside air temperature sensor
circuit
• Outside air temperature sensor
• HVAC control module
Step Action Yes No
1Was “Air Conditioning System Check” performed?Go to Step 2. Go to “Air Conditioning
System Check”.
2DTC check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Check DTC in BCM.
Is DTC B1141 or B1142 detected?Go to applicable DTC
diag. flow.Substitute a known-
good HVAC control
module and recheck.
DTC detecting condition Trouble area
HVAC control module receives invalid data of A/C refrigerant pressure signal
from BCM.• A/C refrigerant pressure sensor
circuit
• A/C refrigerant pressure sensor
• HVAC control module
Step Action Yes No
1Was “Air Conditioning System Check” performed?Go to Step 2. Go to “Air Conditioning
System Check”.
2DTC check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Check DTC in ECM.
Is DTC P0532 or P0533 detected?Go to applicable DTC
diag. flow.Substitute a known-
good HVAC control
module and recheck.

Downloaded from www.Manualslib.com manuals search engine Air Conditioning System: Automatic Type 7B-79
Reference waveform No. 1
Rear defogger switch or A/C switch signal (1)Reference waveform No. 2
Serial communication line of BCM (1)
A/C System Inspection at ECMS6RW0D7224030
When checking voltage at ECM terminals related to A/C system, refer to “Inspection of ECM and Its Circuits in Section
1A”.
Repair Instructions
Operation Procedure for Refrigerant ChargeS6RW0D7226001
Refer to “Operation Procedure for Refrigerant Charge”.Measurement terminal Rear defogger switch
CH1: “G20-4” to “G20-23” A/
C switch
CH1: “G20-21” to “G20-23”
Oscilloscope setting CH1: 5 V / DIV
TIME: 10 ms / DIV
Measurement condition Rear defogger switch:
• Ignition switch is at ON
position and rear defogger
switch is not pushed
A/C switch:
• Ignition switch is at ON
position and A/C switch is
not pushed
I7RW01722014-02
Measurement terminal CH1: “G20-13” to “G20-23”
Oscilloscope setting CH1: 5 V / DIV
TIME: 20 ms / DIV
Measurement condition Ignition switch is at ON
position
I7RW01722015-02

Downloaded from www.Manualslib.com manuals search engine Air Conditioning System: Automatic Type 7B-87
Condenser Cooling Fan Relay InspectionS6RW0D7226020
Refer to “A/C System Relay Inspection”.
Condenser Cooling Fan Removal and
Installation
S6RW0D7226021
Refer to “Condenser Cooling Fan Removal and
Installation”.
Condenser Cooling Fan InspectionS6RW0D7226022
Refer to “Condenser Cooling Fan Inspection”.
Condenser Assembly On-Vehicle InspectionS6RW0D7226023
Refer to “Condenser Assembly On-Vehicle Inspection”.
Condenser Assembly Removal and InstallationS6RW0D7226024
Refer to “Condenser Assembly Removal and
Installation”.
Evaporator InspectionS6RW0D7226025
Refer to “Evaporator Inspection”.
Evaporator Temperature Sensor Removal and
Installation
S6RW0D7226026
Refer to “Evaporator Temperature Sensor Removal and
Installation”.
Evaporator Temperature Sensor InspectionS6RW0D7226027
Refer to “Evaporator Temperature Sensor Inspection”.
Expansion Valve Removal and InstallationS6RW0D7226028
Refer to “Expansion Valve Removal and Installation”.
Expansion Valve InspectionS6RW0D7226029
Refer to “Expansion Valve Inspection”.
A/C Refrigerant Pressure Sensor and Its Circuit
Inspection
S6RW0D7226030
Refer to “A/C Refrigerant Pressure Sensor and Its Circuit
Inspection”.
A/C Refrigerant Pressure Sensor Removal and
Installation
S6RW0D7226031
Refer to “A/C Refrigerant Pressure Sensor Removal and
Installation”.
Compressor Relay InspectionS6RW0D7226032
Refer to “A/C System Relay Inspection”.
Compressor Drive Belt Inspection and
Adjustment
S6RW0D7226033
Refer to “Compressor Drive Belt Inspection and
Adjustment”.
Compressor Drive Belt Removal and
Installation
S6RW0D7226034
Refer to “Compressor Drive Belt Removal and
Installation”.
Compressor Assembly Removal and
Installation
S6RW0D7226035
Refer to “Compressor Assembly Removal and
Installation”.
Compressor Assembly ComponentsS6RW0D7226036
Refer to “Compressor Assembly Components”.
Magnet Clutch Removal and InstallationS6RW0D7226037
Refer to “Magnet Clutch Removal and Installation”.
Magnet Clutch InspectionS6RW0D7226038
Refer to “Magnet Clutch Inspection”.
Thermal Switch InspectionS6RW0D7226039
Refer to “Thermal Switch Inspection”.
Thermal Switch Removal and InstallationS6RW0D7226040
Refer to “Thermal Switch Removal and Installation”.
Relief Valve InspectionS6RW0D7226041
Refer to “Relief Valve Inspection”.