2006 SUZUKI SX4 terminal

Downloaded from www.Manualslib.com manuals search engine 7B-12 Air Conditioning System: Manual Type
A/C System Inspection at ECMS6RW0D7214003
When checking voltage at ECM terminals related to A/C system, refer to “Inspection of ECM and Its Circuits in Section
1A”.0.05 – 0.15
(0.5 – 1.5)
(4.2 – 21.3)0.7 – 1.0
(7 – 10)
(100 – 142)Both low and high
pressure sides indicate
low readings.
Output air is slightly cold.Insufficient refrigerant
in system
(Refrigerant leaking).Using leak detector,
check for leaks and
repair as necessary.
Recharge refrigerant to
a specified amount.
If the pressure reading
is almost 0 when the
manifold gauges are
attached, check for any
leaks, repair them, and
evacuate the system.
0.4 – 0.6
(4 – 6)
(56.9 – 85.3)Pressure on low pressure
side is high.
Pressure on high pressure
side is low.
Both pressure becoming
equal right after A/C is
turned OFF.Internal leak in
compressor.Inspect compressor
and repair or replace
as necessary.
0.40 – 0.45
(4.0 – 4.5)
(57 – 64)2.0 – 2.5
(20 – 25)
(285 – 355)High pressure reading on
both low and high
pressure sides.Overcharged A/C
system.Adjust refrigerant to
specified amount.
Faulty condenser
cooling operation.Clean condenser.
Faulty condenser
cooling fan operation.Inspect and repair
condenser cooling fan.
High pressure reading on
both low and high
pressure sides.
Low pressure side tubing
is not cold when touched.Presence of air in A/C
system
(Improperly
evacuated).Replace desiccant and
cap with filter.
Inspect quantity of
compressor oil and
presence of
contaminants in oil.
Evacuate system and
recharge with fresh
refrigerant.
0.45 – 0.55
(4.5 – 5.5)
(64 – 78)High pressure reading on
both low and high
pressure sides.
Large amount of frost or
dew on the low pressure
side tubing.Faulty expansion
valve.
Refrigerant flow is not
regulated properly.Replace expansion
valve. Condition
Possible cause Correction Manifold gauge MPa (kgf/cm
2) (psi)
Detail
Lo Hi

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Condenser Cooling Fan InspectionS6RW0D7216003
1) Check condenser cooling fan motor for resistance
between terminal “a” and “b” as shown.
If there is no continuity, replace condenser cooling
fan motor.
2) Connect battery to condenser cooling fan motor
terminal “a” and “b” as shown in figure, and then
check if the condenser cooling fan motor operates
smoothly.
Reference
Condenser cooling fan specified current at 12 V:
7 A maximum
Condenser Assembly On-Vehicle InspectionS6RW0D7216004
Check the followings.
• Clog of condenser fins
If any clog is found, condenser fins should be washed
with water and should be dried with compressed air.
• Condenser fins for leakage and breakage
If any defects are found, repair or replace condenser.
• Condenser fittings for leakage.
If any defects are found, repair or replace condenser.
Condenser Assembly Removal and InstallationS6RW0D7216005
CAUTION!
Do not damage condenser fins. If condenser
fin is bent, straighten it by using flat head
screwdriver or pair of pliers.

Removal
1) Recover refrigerant from A/C system referring to
“Operation Procedure for Refrigerant Charge”.
NOTE
The amount of removed compressor oil must
be measured for replenishing compressor
oil.

2) Remove front bumper referring to “Front Bumper
and Rear Bumper Components in Section 9K”.
3) Disconnect discharge hose (1) and liquid pipe (2)
from condenser assembly (3).
4) Remove radiator assembly and condenser assembly
mounting bolts (4).
ab
I5RW0A721018-02
a
b
I5RW0A721019-02
1
2
3
4
4
I7RW01721025-04

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Evaporator Temperature Sensor InspectionS6RW0D7216011
Check resistance between terminals of evaporator
temperature sensor (1).
If check results are as not specified, replace evaporator
temperature sensor.
Evaporator temperature sensor resistance
0 °C (32 °F): 6.6 – 6.8 kΩ
25 °C (77 °F): 2.0 – 2.1 kΩ
Expansion Valve Removal and InstallationS6RW0D7216012
Removal
1) Recover refrigerant from the A/C system with
recovery and recycling equipment referring to
“Recovery” in “Operation Procedure for Refrigerant
Charge”.
2) Loosen a bolt (1) and remove pipes from expansion
valve (2).
3) Loosen bolts (3) and remove expansion valve.
Installation
Reverse removal procedure noting the following
instructions.
• Apply compressor oil to O-ring of expansion valve and
pipes.
• Tighten expansion valve bolts to specified torque.
Tightening torque
Expansion valve bolt: 4.5 N·m (0.45 kgf-m, 3.5 lb-
ft)
• Evacuate and charge the A/C system referring to
“Evacuation” and “Charge” in “Operation Procedure
for Refrigerant Charge”.
Expansion Valve InspectionS6RW0D7216013
Refer to “A/C System Performance Inspection”.
[A]: Resistance
[B]: Temperature
(kΩ)
6.75
2.00
0
3225
77 [A]
[B]
(˚C)
(˚F)
1
I7RW01721020-01
1
22 3
I4RS0A720028-01

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A/C Refrigerant Pressure Sensor and Its Circuit
Inspection
S6RW0D7216014
1) Disconnect A/C refrigerant pressure sensor
connector.
2) Turn ignition switch to ON position.
3) Check if voltage between “RED” wire terminal and
“ORN” wire terminal of A/C refrigerant pressure
sensor connector is 4.75 V to 5.25 V.
If not, check A/C refrigerant pressure sensor circuit.
4) Connect A/C refrigerant pressure sensor connector
with ignition switch turned OFF.
5) Connect manifold gauge set to the charging valves.
6) Check A/C refrigerant pressure sensor voltage of
ECM connector referring to “A/C System Inspection
at ECM”.
If voltage is not as specified below, replace A/C
refrigerant pressure sensor.
A/C refrigerant pressure sensor voltage
specifications (A/C refrigerant pressure measured
by manifold gauge)
0.8 MPa (8.0 kgf/cm2, 116 psi): 1.40 – 1.78 V
1.4 MPa (14 kgf/cm2, 203 psi): 2.18 – 2.64 V
1.6 MPa (16 kgf/cm2, 232 psi): 2.44 – 2.92 V
1.8 MPa (18 kgf/cm2, 261 psi): 2.70 – 3.21 V
A/C Refrigerant Pressure Sensor Removal and
Installation
S6RW0D7216015
Removal
1) Recover refrigerant from the A/C system with the
recovery and recycling equipment referring to
“Recovery” in “Operation Procedure for Refrigerant
Charge”.
2) Disconnect negative (–) cable from battery.
3) Disconnect A/C refrigerant pressure sensor
connector.
4) Remove A/C refrigerant pressure sensor (1) from
liquid pipe (2).Installation
Reverse removal procedure noting the following
instructions.
• Apply compressor oil to O-ring of A/C refrigerant
pressure sensor.
• Tighten A/C refrigerant pressure sensor to specified
torque.
Tightening torque
A/C refrigerant pressure sensor (a): 11 N·m (1.1
kgf-m, 8.0 lb-ft)
• Evacuate and charge the A/C system referring to
“Evacuation” and “Charge” in “Operation Procedure
for Refrigerant Charge”.
A/C Switch InspectionS6RW0D7216016
• Check that there is continuity between terminal (1)
and terminal (2) when A/C switch is at ON position.
• Check that there is no continuity between terminal (1)
and terminal (2) when A/C switch is at OFF position.
If check result does not meet the above conditions,
replace HVAC control unit.
2
1
I5RW0A721029-01
(a)
I5RW0A721030-01
1
2
I5RW0A721031-01

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A/C System Relay InspectionS6RW0D7216017
NOTE
Do not use blue relay for the substitute of
white relay because internal durability of a
blue relay is different from the durability of a
white relay.

1) Disconnect negative (–) cable from battery.
2) Remove compressor relay (1) or condenser cooling
fan relay (2) from main fuse box (3).
3) Check that there is no continuity between terminal
“c” and “d”. If there is continuity, replace relay.
4) Connect battery positive (+) terminal to terminal “b”
of relay and battery negative (–) terminal to terminal
“a” of relay, and then check continuity between
terminal “c” and “d”. If there is no continuity, replace
relay.
Compressor Drive Belt Inspection and
Adjustment
S6RW0D7216018
Inspection
• Check compressor drive belt (1) for wear, crack,
deformation and cleanliness. If any defect is found,
replace the belt with new one referring to
“Compressor Drive Belt Removal and Installation”.
• Check compressor drive belt tension by measuring
how much it deflects when pushed intermediate point
between magnet clutch pulley (6) and crankshaft
pulley (3) with about 100 N (10 kg) force after rotating
crankshaft pulley 360°. If belt tension is out of
specification, adjust belt tension referring to
“Adjustment”.
Compressor drive belt tension
“a”
: 7 – 8 mm (0.28 – 0.31 in.)
NOTE
When replacing drive belt, adjust drive belt
tension to the following specifications.

New compressor drive belt tension “a”
: 6 – 7 mm (0.24 – 0.28 in.)
Adjustment
1) Loosen tension pulley nut (4).
2) Adjust belt tension by tighten or loosen tension
pulley adjusting bolt (5).
3) Tighten tension pulley nut.
4) Rotate the crankshaft pulley 360°, and then recheck
belt tension.
3
1
2
“a”
“b”“c”
“d”
I5RW0B721023-01
2. Tension pulley
I5RW0A721033-01

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Installation
1) Install magnet clutch coil (2) fitting protrusion (4) of
magnet clutch coil onto hole (5) of compressor (3).
2) Install circlip (1) directing chamfer side (6)
downward.
Special tool
(B): 09900–06107
3) Install thermal switch to compressor referring to
“Thermal Switch Removal and Installation”.
4) Install magnet clutch pulley (1).
5) Install new circlip (2) directing chamfer side (3)
upward.
Special tool
(B): 09900–061076) Tighten new armature plate bolt to specified torque.
Tightening torque
Armature plate nut (a): 16 N·m (1.6 kgf-m, 11.5
lb-ft)
Special tool
(A): 09991–06310
7) Adjust clearance between armature plate (1) and
magnet clutch pulley by putting shim(s) on
compressor shaft. To measure the clearance,
perform the following steps.
a) Put compressor in a vise (2).
b) Set dial gauge (3) on armature plate, and then
adjust its pointer at 0.
c) Connect battery positive terminal (+) to magnet
clutch coil lead wire.
d) Connect battery negative terminal (–) to
compressor body assembly. (At this point,
armature plate and magnet clutch pulley are kept
in contact.)
e) Disconnect battery negative terminal (–) to
compressor body assembly. (At this point,
armature plate and magnet clutch pulley are not
in contact.)
1(B)
2
34
56
I4RS0A720043-01
1
32(B)
I4RS0A720044-01
(a)
(A)
I4RS0A720045-01

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

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DTC Detecting Condition and Trouble Area
DTC Troubleshooting
NOTE
When DTC B1503, B1504, B1511 and B1512 are indicated together, it is possible that sensor ground
circuit is open.

DTC Detecting Condition Trouble Area
Inside air temperature sensor signal voltage is higher than or lower than
specified value for specified time continuously.• Inside air temperature sensor circuit
• Inside 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”.
2Wire harness check
1) Turn ignition switch to OFF position.
2) Disconnect connectors from inside air temperature
sensor and HVAC control module.
3) Check for proper connection to each signal circuit
terminal and ground circuit terminal of inside air
temperature sensor and HVAC control module
connectors.
4) If OK, check that inside air temperature sensor circuit is
as follows.
• Wiring harness resistance of each inside air
temperature sensor signal circuit and ground circuit is
less than 3 Ω
• Insulation resistance between inside air temperature
sensor signal circuit and vehicle body ground is
infinity
• Circuit voltage of each inside air temperature sensor
signal circuit and ground circuit is 0 – 1 V with ignition
switch turned ON
Are they in good condition?Go to Step 3. Inside air temperature
sensor signal circuit
and/or ground circuit are
open, short or high
resistance.
3Inside air temperature sensor reference voltage check
1) Connect connector to HVAC control module with ignition
switch turned OFF.
2) Turn ignition switch to ON position.
3) Measure voltage between signal terminal and ground
terminal of inside air temperature sensor connector.
Is voltage 4.5 – 5.5 V?Go to Step 4. Substitute a known-
good HVAC control
module and recheck.
4Inside air temperature sensor check
1) Check inside air temperature sensor for performance
referring to “Inside Air Temperature Sensor Inspection”.
Is it in good condition?Substitute a known-
good HVAC control
module and recheck.Replace inside air
temperature sensor.