Vitara SUZUKI GRAND VITARA 1998 2.G Service Manual Online

YH4
GRAND
VITARA
AIR CONDITIONING (OPTIONAL) 1B-13
9) Check for each pressure of low side and high side if it is within
shaded range of graph.
If each gauge reading is out of specified pressure, correct de-
fective part referring to following Test Diagnosis table.
Example:
Gauges should read as follows when ambient
temperature is 30
C.
Pressure on high pressure
gauge (HI):1400 ± 1750 kPa
14.0 ± 17.5 kg / cm
2
Pressure on high pressure
gauge (LO):230 ± 350 kPa
2.3 ± 3.5 kg / cm
2
NOTE:
Pressure registered on gauge varies with ambient temper-
ature. Therefore, use left graphs when determining if pres-
sures are normal or not.
10) Check inlet port temperature-to-outlet port temperature rela-
tionship using graph.
For example, if evaporator inlet port temperature is 25
C
(77
F) and center duct air outlet temperature is 8
C (46.4
F),
their crossing point is within acceptable range as shown in
graph.
11) If crossing point is out of acceptable range, diagnose trouble
referring to following Performance Diagnosis table.

YH4
GRAND
VITARA
1B-14 AIR CONDITIONING (OPTIONAL)
HIGH PRESSURE CAUGE LOW PRESSURE GAUGE THERMOMETER AT
CENTER DUCT
Insufficient
cooling of
condenser
PERFORMANCE DIAGNOSIS TABLE
TESTING RESULTSPOSSIBLE CAUSEREMEDY
Pressure high
(ªAº area of high side
graph)
Refrigerant overcharged

Expansion valve frozen or clogged

Clogged refrigerant passage of high side

Condenser fan malfunction

Dirty or bent condenser fins

Compressor malfunction (Insufficient oil etc.)

Engine overheat
Recharge

Check expansion valve

Clean or replace

Check condenser fan

Clean or repair

Check compressor

Check engine cooling
system
Pressure low
(ªBº area of high side
graph)
Insufficient refrigerant (Insufficient charge or
leakage)

Expansion valve malfunction (Valve opens too
wide)

Compressor malfunction (Insufficient
compression)
Check for leakage, repair if
necessary and recharge

Check expansion valve

Check compressor
Pressure high
(ªAº area of low side
graph)
Expansion valve malfunction (Valve opens too
wide)

Compressor malfunction (Insufficient
compression)
Check expansion valve

Check compressor
Pressure low
(ªBº area of low side
graph)
Insufficient refrigerant (Insufficient charge or
leakage)

Expansion valve malfunction (Valve opens too
narrow)

Clogged refrigerant passage (Crashed pipe)
Check for leakage, repair if
necessary and recharge

Check expansion valve

Repair or replace
Outlet air temperature
at center duct is high
(Crossing point is in
area ªAº)
Insufficient or excessive charge of refrigerant

Dirty or bent evaporator fins

Air leakage from cooling (heater) unit or air
duct

Malfunctioning, switchover function of damper
in cooling (heater) unit

Compressor malfunction
Check refrigerant
pressure

Clean or repair

Repair or replace

Repair or replace

Check compressor
Outlet air temperature
at center duct is low
(Crossing point is in
area ªBº)
Insufficient air volume from center duct
(Heater blower malfunction)

Compressor malfunction
Check blower motor and
fan

Check compressor
NOTE:
If ambient temperature is within 30 ± 35C (85 ± 95F), it is possible to do using next page table for more
detail diagnosis.

YH4
GRAND
VITARA
AIR CONDITIONING (OPTIONAL) 1B-15
AMBIENT TEMPERATURE WITHIN 30 ± 35C (85 ± 95F)
CONDITION
MANIFOLD
GAUGEMPa
(kg/cm2)
(psi)DETAILCAUSECORRECTION
LoHi
0.23 ± 0.35
(2.3 ± 3.5)
(33 ± 50)1.4 ± 1.75
(14 ± 17.5)
(200 ± 249)
Normal condition.ÐÐÐÐ
Negative
pressure0.5 ± 0.6
(5 ± 6)
(71.2 ± 85.3)

The low pressure side
reads a negative pressure,
and the high pressure side
reads an extremely low
pressure.

Presence of frost around
tubing to and from receiver /
dryer and expansion valve.
Dust particles or water
droplets are either stuck or
frozen inside expansion
valve, preventing the
refrigerant from flowing.
Clean expansion valve.
Replace it if it cannot be
cleaned.

Replace receiver / dryer.

Evacuate the A / C
system and recharge
with fresh refrigerant.
Normal:
0.23 ± 0.35
(2.3 ± 3.5)
(33 ± 50)

Abnormal:
Negative
pressureNormal:
1.4 ± 1.75
(14 ± 17.5)
(200 ± 249)

Abnormal:
0.69 ± 0.98
(7 ± 10)
(100 ± 142)
During A / C operation, the
low pressure side
sometimes indicates
negative pressure, and
sometimes normal
pressure. Also high
pressure side reading
fluctuates between the
abnormal and normal
pressure.
Expansion valve is frozen
due to moisture in the
system, and temporarily
shuts off the refrigeration
cycle.
Replace expansion
valve.

Replace receiver / dryer.

Evacuate A / C system
and recharge with fresh
refrigerant.
0.05 ± 0.15
(0.5 ± 1.5)
(4.2 ± 21.3)
0.69 ± 0.98
(7 ± 10)
(100 ± 142)

Both low and high pressure
sides indicate low readings.

Continuous air bubbles are
visible through sight glass.

Output air is slightly cold.
Insufficient refrigerant in
system. (Refrigerant
leaking)
Using a gas 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.
035 045

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.

Faulty condenser cooling
operation.

Faulty condenser fan
operation.
Adjust refrigerant to
specified amount.

Clean condenser.

Inspect and repair
condenser fan.
0.35 ± 0.45(3.5 ± 4.5)
(50 ± 64)
1.96 ± 2.45
(20 ± 25)
(285 ± 355)

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
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.

YH4
GRAND
VITARA
1. Blower motor main relay
2. Blower motor
3. Blower motor resistor
4. Blower motor switch
5. A / C controller
6. ECM
7. Heater mode control switch
8. Evaporator temperature sensor
9. Refrigerant pressure switch10. Compressor relay
11. Compressor
12. Condenser cooling fan relay
13. Condenser cooling fan
14. Fuse box
15. A / C fuse 25 A
16. Ignition switch
17. Main fuse box
18. Battery main fuse 80 A19. Battery
20. Generator
21. Ignition main fuse 60 A
22. Heater/A/C main fuse 60 A
23. Ignition / meter fuse 20 A
24. Rear defogger fuse 15 A
25. Heater fuse 30 A
26. Compressor thermal switch
(only IWATA production vehicle)
FOR LH VEHICLE
1B-16 AIR CONDITIONING (OPTIONAL)
WIRING CIRCUIT

YH4
GRAND
VITARA
AIR CONDITIONING (OPTIONAL) 1B-17
1. Blower motor main relay
2. Blower motor
3. Blower motor resistor
4. Blower motor switch
5. A / C controller
6. ECM
7. Heater mode control switch
8. Evaporator temperature sensor
9. Refrigerant pressure switch
FOR RH VEHICLE
10. Compressor relay
11. Compressor
12. Condenser cooling fan relay
13. Condenser cooling fan
14. Fuse box
15. A / C fuse 25 A
16. Ignition switch
17. Main fuse box
18. Battery main fuse 80 A19. Battery
20. Generator
21. Ignition main fuse 60 A
22. Heater/A/C main fuse 60 A
23. Ignition / meter fuse 20 A
24. Rear defogger fuse 15 A
25. Heater fuse 30 A
26. Compressor thermal switch
(only IWATA production vehicle)

YH4
GRAND
VITARA
Fig. A
Fig. B
Fig. C
C51-3-6 For G16
and J20 engines
C51-3-25 For
H25 engine
1B-18 AIR CONDITIONING (OPTIONAL)
INSPECTION OF A / C CONTROLLER AND ITS
CIRCUITS
CAUTION:
A / C controller and ECM cannot be checked by itself.
It is strictly prohibited to connect voltmeter or ohmmeter to
A / C controller and ECM with couplers disconnected from it.
A / C controller (1) and its circuits can be checked at A / C controller
wiring couplers by measuring voltage.
Voltage Check
1) Remove A / C controller (1) from vehicle (refer to ªA / C CON-
TROLLER REMOVALº in this section).
2) Remove ECM (2) from vehicle.
3) Connect A / C controller couplers to A / C controller and connect
ECM couplers to ECM.
4) Check each terminal voltage with couplers connected by refer-
ing to the A / C CONTROLLER VOLTAGE VALUES TABLE the
later.

YH4
GRAND
VITARA
SYSTEM CIRCUIT
A. To heater fuse
B. To rear defogger fuse
C. To ignition / meter fuse
D. To A / C fuse
E. Only LH vehicle1. Blower motor relay
2. Blower motor
3. Blower motor switch
4. A / C switch
5. Deflloster position switch
6. Deflloster / foot position switch7. Dual pressure (refrigerant
pressure) switch
8. A / C thermistor (evaporator
temperature sensor)
9. Compressor relay
10. Compressor11. Condenser fan motor relay
12. Condenser fan motor
13. A / C controller
14. ECM
15. Compressor thermal switch
(only IWATA production vehicle)
TERMINAL ARRANGEMENT OF A / C CONTROLLER
TERMINAL ARRANGEMENT OF ECM FOR G16, J20 ENGINE
TERMINAL ARRANGEMENT OF ECM FOR H25 ENGINE
H25 engine
E61-27
G16, J20
engines
E61-8
H25 engine
E61-28
G16, J20
engines
E61-17
1919
19H25 engine
E61-5
G16, J20
engines
E61-22
AIR CONDITIONING (OPTIONAL) 1B-19

YH4
GRAND
VITARA
1B-20 AIR CONDITIONING (OPTIONAL)
A / C CONTROLLER VOLTAGE VALUES TABLE
TerminalWireCircuitMeasurement
groundNormal valueCondition
AC1-1B/WController main
power supplyGround to
engine (Fig. B)10 ± 14 voltsIgnition switch ON with engine
stopped
AC1-2B/YController main
groundGround to body
(Fig. A)± 0.4 ± 0 voltEngine running
AC1 4Or
Refrigerant
p
ressure switchGround to
0 ± 1 volt
Refrigerant pressure within 225 kPa
(2.3 kg / cm
2, 32.7 psi) to 2548 kPa
(26 kg / cm
2, 370 psi) with engine
running
AC1-4Orpressure switch
inputengine (Fig. B)
10 ± 14 volts
Refrigerant pressure below
196 kPa (2.0 kg / cm
2, 28 psi) or
above 3140 kPa (32 kg / cm
2, 455 psi)
with engine running
AC1 7G/B
A / C switch input
and / or defroster
Ground to
8 ± 14 volts
Blower fan motor switch and A / C or
defroster position switch (see NOTE)
ON with engine running
AC1-7G/Bposition switch
input (see NOTE)engine (Fig. B)
0 ± 1.5 volts
Blower fan motor switch or A / C or
defroster position switch (see NOTE)
OFF with engine running
AC1 9Gr/W
Signal input from
ECM (A / C ON
Ground to10 ± 14 voltsApprove of A / C ON
AC1-9Gr/W(
permission
signal)engine (Fig. B)0 ± 1 voltA / C ON forbid
AC1-13Y/B
Signal output to
ECM (A / C ON
request signal)Ground to engine
(Fig. B)0 ± 1.5 volts
Blower fan motor switch and A / C or
defroster position switch (see NOTE)
ON with engine running at evaporator
thermistor temperature input more
than approx. 2.5
C (less than 2.5 V
(5840
)) and refrigerant pressure
switch is ON
10 ± 14 voltsExcept the above-mentioned with
engine running
AC1-16P
Compressor
magnet clutch
relay outputGround to engine
(Fig. B)0 ± 1 volt
Blower fan motor switch and A / C or
defroster position switch ON with
engine running at evaporator
thermistor temperature input more
than approx. 2.5
C (less than 2.5 V
(5840
)), refrigerant pressure
switch ON and signal input from ECM
ON
10 ± 14 voltsExcept the above-mentioned with
engine running

YH4
GRAND
VITARA
AIR CONDITIONING (OPTIONAL) 1B-21
TerminalWireCircuitMeasurement
groundNormal valueCondition
AC2-1L/YSensor groundGround to body
(Fig. A)± 0.4 ± 0 voltEngine running
1.5 volts
(3150
)Evaporator thermistor temperature at
approx. 15C (59F) with engine
running
AC2-2W/B
Evaporator
thermistor
temperature
(evaporator temp.
sensor) input
Ground to engine
(Fig. B)
2.62 volts
(6.311
)
Evaporator thermistor temperature at
approx. 1C (34F) with engine
running
* If the temperature is less than
approx. 1C, in this case
compressor and condenser fan
should be stop (come back at more
than approx. 2.5C (less than
5840
, 2.5 V))
H25
engine
E61-27 /
G16 J20Gr/W
Signal output to
A / C controller
(A / C ON
Ground to engine
(Fig C)
10 ± 14 volts
Required A / C ON (terminal AC-A13)
at engine running with normal
condition (refer to ªINSPECTION OF
ECM AND ITS CIRCUITº in Section
6E)
G16, J20
engines
E61-8
(
permission
signal)(Fig. C)
0 ± 1 volt
Except the above-mentioned with
engine running
In this case compressor should be
stop
H25
engine
E61-28 /
Y/B
Signal input from
A / C controller
Ground to engine
0 ± 1.5 voltsRequire A / C ON
G16, J20
engines
E61-17Y/B(A / C ON request
signal)
g
(Fig. C)
10 ± 14 voltsTurn off the A / C
H25
engine
E61-5 /
G16, J20
engines
E61-22
Y/L
A / C condenser
cooling fan relay
outputGround to engine
(Fig. C)0 ± 1 volt

Blower fan motor switch and A / C or
defroster position switch (see
NOTE) ON with engine running at
evaporator thermistor temperature
input more than approx. 2.5C (less
than 2.5 V (5840
)), refrigerant
pressure switch ON and signal
input from ECM ON

Engine coolant temperature sensor
more than 113C (236F) with
engine running
10 ± 14 voltsExcept the above-mentioned with
engine running
NOTE:
Defroster position switch circuit is equipped with LH vehicle only.

YH4
GRAND
VITARA
J20 engine
H25 engine G16 engine
1. Generator belt
2. Compressor drive belt3. Compressor pulley
4. Crankshaft pulley
1B-22 AIR CONDITIONING (OPTIONAL)
DRIVE BELT
INSPECTION
For G16 and H25 engines
Refer to Section 3B1 for details.
For J20 engine
Refer to Section 6H for details.