2000 SUZUKI SWIFT air conditioning

1B-14 AIR CONDITIONING (OPTIONAL)
0.35 – 0.45
(3.5 – 4.5)
(50 – 64)2.0 – 2.5
(20 – 25)
(285 – 355)High pressure reading on
both low and high pressure
sides.
Air bubbles are not visible
even when engine rpm is
lowered.Overcharged A/C system Adjust refrigerant to specified
amount.
Faulty condenser cooling
operationClean condenser.
Faulty radiator/condenser
cooling fan operationInspect and repair radiator/
condenser cooling fan.
High pressure reading on
both low and high pressure
sides.
Low pressure side tubing is
not cold when touched.
Air bubbles are visible
through sight glass.Presence of air in A/C system
(Improperly evacuated)Replace receiver/dryer.
Inspect quantity of compres-
sor oil and presence of con-
taminants in oil.
Evacuate system and
recharge with fresh refriger-
ant.
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 regu-
lated properlyReplace expansion valve. Condition
Possible Cause Correction MANIFOLD
GAUGEMPa
(kg/cm
2)
(psi)Detail
Lo Hi

AIR CONDITIONING (OPTIONAL) 1B-15
COMPRESSOR DRIVE BELT
INSPECTION
Check compressor drive belt (6) for wear and cracks, and
replace as required.
Check compressor drive belt (6) tension by measuring how
much it deflects when pushed at intermediate point between
compressor pulley (1) and tension pulley (2) with about 100
N (10 kg) force after crankshaft pulley 1 rotating.
If belt tension is without specification, adjust belt tension
referring to below procedures.
Compressor drive belt tension
“a” : 3 – 5 mm (0.12 – 0.20 in.)
New compressor drive belt tension
“a” : 2 – 4 mm (0.08 – 0.16 in.)
ADJUSTMENT
1) Loosen tension pulley nut (3).
2) Adjust belt tension by tighten or loosen tension pulley adjust-
ing bolt (4).
3) Tighten tension pulley nut (3).
4) Turn the crank pulley (5) 1 revolution, then check belt ten-
sion.
REPLACEMENT
1) Loosen tension pulley nut (3).
2) Loosen belt tension by loosen tension pulley adjusting bolt
(4).
3) Remove compressor drive belt (6).
4) Install new compressor drive belt.
5) Adjust belt tension referring to above procedure.

1B-16 AIR CONDITIONING (OPTIONAL)
ELECTRICAL DIAGNOSIS
WIRING DIAGRAM
1. Blower fan motor 6. Radiator/condenser cooling fan relay No.2 11. Ignition switch 16. Main fuse box
2. Blower fan motor resistor 7. Radiator/condenser cooling fan relay No.3 12. A/C evaporator temperature sensor 17. Generator
3. Blower fan switch and A/C switch 8. Radiator/condenser cooling fan motor 13. ECT sensor 18. Compressor
4. A/C refrigerant pressure switch 9. Compressor thermal switch 14. Lighting switch
5. Radiator/condenser cooling fan relay No.1 10. Main relay 15. Circuit fuse box

AIR CONDITIONING (OPTIONAL) 1B-17
A/C SYSTEM INSPECTION OF ECM AND ITS
CIRCUITS
ECM and its circuits can be checked at ECM wiring couplers by
measuring voltage.
VOLTAGE CHECK
1) Remove ECM from vehicle by referring to “ECM (PCM)
REMOVAL AND INSTALLATION” in Section 6E1.
2) Connect ECM couplers (1) to ECM (2).
3) Check voltage at each terminal of couplers connected.CAUTION:
ECM cannot be checked by itself. It is strictly prohibited
to connect voltmeter or ohmmeter to ECM with couplers
disconnected from it.
NOTE:
As each terminal voltage is affected by the battery volt-
age, confirm that it is 11 V or more when ignition switch
is ON position.
[A] : Fig. A
[B] : Fig. B

1B-18 AIR CONDITIONING (OPTIONAL)
System Circuit
Terminal arrangement of ECM coupler (Viewed from harness side)
1. Blower fan motor 8. Main relay A. To “HTR” fuse (25 A) in circuit fuse box
2. Blower fan switch 9. Radiator/condenser cooling fan motor relay No.1 B. To main fuse (15 A)
3. A/C switch 10. Radiator/condenser cooling fan motor relay No.2 C. To main fuse (30 A)
4. A/C refrigerant pressure switch 11. Radiator/condenser cooling fan motor relay No.3
5. Compressor 12. Radiator/condenser cooling fan motor
6. A/C evaporator temperature sensor 13. Engine earth
7. ECT sensor 14. ECM

AIR CONDITIONING (OPTIONAL) 1B-19
ECM Voltage Values Table for Relation of A/C Control
Terminal Wire Circuit Measurement
groundNormal value Condition
C41-1 PNK/BLK Compressor magnet
clutch outputGround to engine
(Fig B)12 – 15 V Except the above-mentioned condition with engine
running
0 – 1 V Blower fan switch and A/C switch ON with engine
running
C41-5 BLK/RED Main power supply for
ECMGround to engine
(Fig B)10 – 14 V Ignition switch ON with engine stopped
C41-6 BLK/RED Main power supply for
ECMGround to engine
(Fig B)10 – 14 V Ignition switch ON with engine stopped
C41-10 BRN/
WHTMain relay drive Ground to engine
(Fig B)0.5 – 1.2 V Ignition switch ON with engine stopped
10 – 14 V Ignition switch OFF
C41-16 YEL/GRN A/C switch input Ground to engine
(Fig B)12 – 15 V Blower fan switch or A/C switch OFF with engine
running
0 – 1 V Blower fan switch and A/C switch ON with engine
running
C41-18 BLU Radiator/condenser
cooling fan relay out-
put 1Ground to engine
(Fig B)0 – 1 V Blower fan switch and A/C switch ON
Engine coolant temperature at more than 97.5°C
(207.5°F) with engine running
12 – 15 V Blower fan motor switch or A/C switch OFF
Engine coolant temperature at less than 97.5°C
(207.5°F) with engine running
C42-1 BLK/ORN Main ground for ECM Ground to body
(Fig A)–0.5 – 1 V Engine running
C42-2 BLK ECM ground for
power circuitGround to body
(Fig A)–0.5 – 1 V Engine running
C42-3 BLK/ORN ECM ground for
power circuitGround to body
(Fig A)–0.5 – 1 V Engine running
C42-10 ORN Sensor ground for
ECT sensorGround to body
(Fig A)–0.5 – 1 V Engine running
C42-14 LT GRN/
BLKECT sensor input Ground to engine
(Fig B)0.71 – 0.75 V
(298 – 320 Ω
)Engine coolant temperature at approximately 80°C
(176°F) with engine running
0.35 – 0.37 V
(135 – 144 Ω
)Engine coolant temperature at Approximately
110°C (230°F) with engine running
If the temperature is more than 114°C (232°F),
compressor and condenser cooling fan should be
stop (come back at less than 112°C (230°F))
C42-18 PNK/GRN Medium pressure
switch inputGround to engine
(Fig B)–0.5 – 1 V Medium pressure switch of A/C refrigerant pres-
sure switch ON
12 – 15 V Medium pressure switch of A/C refrigerant pres-
sure switch OFF
G02-3 PPL/YEL Radiator/Condenser
cooling fan relay out-
put 2Ground to engine
(Fig B)0 – 1 V Blower fan motor switch ON, A/C switch ON and
medium pressure switch OFF
Engine coolant temperature at more than 102.5°C
(216.5°F) with engine running
12 – 15 V Blower fan motor switch OFF, A/C switch OFF or
medium pressure switch ON
Engine coolant temperature at less than 102.5°C
(216.5°F) with engine running
G02-10 ORN Sensor ground for A/C
evaporator tempera-
ture sensorGround to engine
(Fig A)–0.5 – 1 V Engine running
G02-13 PNK/BLU Blower fan speed
inputGround to engine
(Fig B)0 – 1 V Blower fan motor switch “ML”, “MH”, or “H” with
engine running
4 – 7 V Blower fan motor switch “L” position with engine
running
12 – 15 V Blower fan motor switch OFF with engine running
G02-14 WHT/BLK A/C evaporator tem-
perature sensor inputGround to engine
(Fig B)2.09 – 2.17 V
(1940 – 2060 Ω
)A/C evaporator temperature at approximately 25°C
(77°F) with engine running
3.52 – 3.59 V
(6450 – 6850 Ω
)A/C evaporator temperature at approximately 0°C
(32°F) with engine running
If the temperature is less than approximately 2.5°C
(36.5°F), compressor and condenser cooling fan
should be stop (come back at more than approxi-
mately 4°C (39.2°F)

1B-20 AIR CONDITIONING (OPTIONAL)
REFRIGERANT RECOVERY, EVACUATING AND CHARGING
OPERATION PROCEDURE FOR REFRIGERANT CHARGING
WARNING:
 Your eyes should not be exposed to refrigerant (liquid).
Any liquid HFC-134a (R-134a) escaping by accident shows a temperature as low as approximately
–6°C (32°F) below freezing point. Should liquid HFC-134a (R-134a) get into your eyes, it may cause a
serious injury. To protect your eyes against such accident, it is necessary to always wear goggles.
Should it occur that HFC-134a (R-134a) strikes your eyes, consult a doctor immediately.
– Do not use your hand to rub the affected eye(s). Instead, use quantities of fresh cold water to
splash it over the affected area to gradually raise temperature of such area above freezing point.
– Obtain proper treatment as soon as possible from a doctor or eye specialist.
 Should the HFC-134a (R-134a) liquid come into contact with your skin, the affected area should be
treated in the same manner as when skin is frostbitten or frozen.
 Refrigerant must not be handled near where welding or steam cleaning is performed.
 Refrigerant should be kept at a cold and dark place. It should never be stored where a high temper-
ature is anticipated, e.g. where exposed to direct sun light, close to fire or inside vehicle (including
trunk room).
 Avoid breathing fumes produced when HFC-134a (R-134a) is burned. Such fumes may be hazard-
ous to health.
Replenish compressor oil
Start evacuating
Inspect and repair connections
Charge 360 ± 30 g of
refrigerant in gas form Stop evacuating 15 minutes (below –760 mmHg)
Wait 10 mintues
If gauge shows
abnormal conditions Check system for
pressure tightness
Check A/C system
With refrigerant
Check system for refrigerant
leaks and refrigerant
charging quantity
Performance test

AIR CONDITIONING (OPTIONAL) 1B-21
RECOVERY
REFRIGERANT RECOVERY
When discharging refrigerant out of A/C system, always recover it
by using refrigerant recovery and recycling equipment. Discharg-
ing refrigerant HFC-134a (R-134a) into atmosphere would cause
adverse effect to environments.
REPLENISHING COMPRESSOR OIL
It is necessary to replenishing specified amount of compressor oil
to compressor (1) from compressor suction side hole (2) before
evacuating and charging refrigerant.
WHEN CHARGING REFRIGERANT ONLY
When charging refrigerant without replacing any component part,
replenish the same amount of measured oil when recover refrig-
erant (if not measure, replenish 30 cc oil).NOTE:
 After recovery refrigerant from system, the amount of
removed compressor oil must be measured for replen-
ishing compressor oil.
 When handling recovery and recycling equipment, be
sure to follow the instruction manual for the equip-
ment.