Suzuki Grand Vitara JB416 / JB420 / JB419. Manual - part 383

7B-23 Air Conditioning System: 

Scan Tool Data

S6JB0A7204006

As the data values given below are standard values estimated on the basis of values obtained from the normally 
operating vehicles by using a scan tool, use them as reference values. Even when the vehicles are in good condition, 
there may be cases where the checked values do not fall within each specifies data range. Therefore, judgement as 
abnormal should not be made by checking with these data alone.

Scan Tool Data

Condition

Normal Condition / 

Reference Value

)

 TEMP CONT SWITCH

Each reference value is relative to the position of 
temperature selector of HVAC control module.

Max Cool, 18 

°C (64.4 °F) 

– 28 

°C (82.4 °F), Max Hot

)

 CABIN TEMPERATURE

Reference value is relative to in car temperature.

–40 

°C – 87.5 °C

(–40 

°F – 189.5 °F) 

)

 OUT SIDE AIR TEMP

Reference value is relative to outside air temperature.

–40 

°C – 87.5 °C

(–40 

°F – 189.5 °F)

)

 EVAPORATOR TEMP

Reference value is relative to temperature of evaporator.

–40 

°C – 87.5 °C

(–40 

°F – 189.5 °F) 

)

 COOLANT TEMP

At specified idle speed after warming up

–40 

°C – 215 °C

(–40 

°F – 419 °F)

)

 SUN LOAD

Reference value depends on the situation.

0 W/m

2

 – 4447.8 W/m

2

)

 MODE CONT SWITCH

Each reference value is relative to the position of airflow 
selector of HVAC control module.

AUTO, VENT, BI-LEVEL, 

FOOT, DEF-FOOT DEF

)

 FAN CONT SWITCH

Each reference value is relative to the position of blower 
speed selector of HVAC control module.

AUTO, OFF 1st, 2nd – 7th, 

8th

)

 FAN DESIRE VOLT

Reference value is relative to the position of blower 
speed selector of HVAC control module.

0 – 16.0 V

)

 AIR MIX POS SENSOR

Reference value is relative to the position of temperature 
selector of HVAC control module.

Approx. 1.5 V (Max Hot)

Approx. 4.5 V (Max Cool)

)

 R/F POS SENSOR

Reference value is relative to the position of air intake 
selector of HVAC control module. (LH steering vehicle)

Approx. 4.0 V (REC)

Approx. 0.9 V (FRE)

)

 R/F POS SENSER

Reference value is relative to the position of air intake 
selector of HVAC control module. (RH steering vehicle)

Approx. 0.9 V (REC)

Approx. 4.0 V (FRE)

)

 MODE POS SENSOR

Reference value is relative to the position of airflow 
selector of HVAC control module.

Approx. 0.5 V (DEF)

Approx. 4.5 V (VENT)

)

 A/C CONT SIG

A/C system is ON.

ON

A/C system is OFF.

OFF

)

 AIR INTAKE MODE

Fresh air (FRE) mode is activated.

FRE

Recirculation air (REC) mode is activated.

REC

AUTO mode is activated.

AUTO

)

 A/C COMP CLUCH

Magnet clutch is engaged.

ON

Magnet clutch is not engaged.

OFF

)

 REFRIGERANT PRESSURE

Engine 
running.

A/C ON (A/C is operating) at ambient 
temperature: 30 

°C (86 °F)

1350 – 1650 kPa for more 

details, refer to pressure of 
high pressure gauge under 

“A/C System Performance 

Inspection”.

A/C ON (A/C is not operating) at ambient 
temperature: 30 

°C (86 °F) and engine coolant 

temperature: 90 

°C – 100 °C (194 °F – 212 °F)

600 – 1000 kPa after 

longer than 10 min from A/

C switch turned off.

)

 A/C INDICATOR LAMP

A/C indicator lamp is lighted.

ON

A/C indicator lamp is not lighted.

OFF

)

 FRE INDICATOR LAMP

Fresh air (FRE) indicator lamp is lighted.

ON

Fresh air (FRE) indicator lamp is not lighted.

OFF

)

 REC INDICATOR LAMP

Recirculation air (REC) indicator lamp is lighted.

ON

Recirculation air (REC) indicator lamp is not lighted.

OFF

)

 REAR DEF INDICATOR

Rear defogger indicator lamp is lighted.

ON

Rear defogger indicator lamp is not lighted.

OFF

)

 SUPPLEMENT HT 1

Additional heater relay No.1 is ON.

ON

Additional heater relay No.1 is OFF.

OFF

)

 SUPPLEMENT HT 2

Additional heater relay No.2 is ON.

ON

Additional heater relay No.2 is OFF.

OFF

Air Conditioning System:  7B-24

Scan Tool Data Definitions
TEMP CONT SWITCH:  Position of temperature control 

selector of HVAC control module

CABIN TEMPERATURE:  In-car temperature detected 

by inside air temperature sensor installed in HVAC 
control module

OUTSIDE AIR TEMP (OUTSIDE AIR 

TEMPERATURE):  Outside air temperature 
detected by outside air temperature sensor installed 
in front bumper member

EVAPORATOR TEMP:  Temperature of air passed 

through evaporator

COOLANT TEMP:  Engine coolant temperature 

detected by engine coolant temperature sensor

SUN LOAD:  Amount of sunlight detected by sunload 

sensor installed on the driver side on the dashboard

MODE CONT SWITCH:  Position of airflow selector of 

HVAC control module

FAN CONT SWITCH:  Position of air speed selector of 

HVAC control module

FAN DESIRE VOLT:  Voltage for blower motor
AIR MIX POS SENSOR:  Input signal from position 

sensor in temperature control actuator

MODE POS SENSOR:  Input signal form position 

sensor in air flow control actuator

R/F POS SENSOR (AIR FLOW CONTROL ACTUATOR 

POSITION SENSOR):  Input signal from position 
sensor in air intake control actuator

A/C CONT SIG (ON or OFF):  State of A/C indicator 

lamp

AIR INTAKE MODE (FRE, REC or MIX):  State of air 

intake mode 

A/C COMP CLUCH:  State of magnet clutch
REFRIGERANT PRESSURE (A/C REFRIGERANT 

ABSOLUTE PRESSURE):  This parameter 
indicates A/C refrigerant absolute pressure 
calculated by ECM

A/C INDICATOR LAMP (ON or OFF):  State of A/C 

indicator lamp

FRE INDICATOR LAMP (ON or OFF):  State of fresh air 

(FRE) indicator lamp

REC INDICATOR LAMP (ON or OFF):  State of 

recirculation air (REC) indicator lamp

REAR DEF INDICATOR (ON or OFF):  State of rear 

defogger indicator lamp

VEHICLE SPEED (Petrol engine model):  It is 

computed based on pulse signals from vehicle 
speed sensor

VEHICLE SPEED (Diesel engine model):  This 

parameter indicates vehicle speed calculated by 
ECM

ENGINE SPEED (Petrol engine model):  It is 

computed by signal from CMP sensor

ENGINE SPEED (Diesel engine model):  This 

parameter indicates engine speed calculated by 
ECM

SUPPLEMENT HT 1 (ON or OFF):  State of additional 

heater relay No. 1

SUPPLEMENT HT 2 (ON or OFF):  State of additional 

heater relay No. 2

SUPPLEMENT HT 3 (ON or OFF):  State of additional 

heater relay No. 3

Visual Inspection

S6JB0A7204007

Visually check the following parts and systems.

)

 SUPPLEMENT HT 3

Additional heater relay No.3 is ON.

ON

Additional heater relay No.3 is OFF.

OFF

)

 VEHICLE SPEED

At stop.

0 km/h (0 mph)

)

 ENGINE SPEED

At engine idle speed

Engine idle speed is 

display

Scan Tool Data

Condition

Normal Condition / 

Reference Value

Inspection Item

Correction

• Refrigerant ---- leakage and amount
• A/C pipe or hose ---- disconnection, looseness and 

deterioration

• A/C compressor drive belt ---- looseness and damage
• 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

Refer to “A/C Compressor Drive Belt Inspection 
and Adjustment”.

7B-25 Air Conditioning System: 

A/C System Performance Inspection

S6JB0A7204008

1) Confirm that vehicle and environmental conditions 

are as follows. 
• Vehicle is put indoors. 
• Ambient air temperature is within 15 – 35 

°C (59 – 

95 

°F).

• Relative humidity is within 30 – 70%.
• There is no wind indoors.
• HVAC unit is normal condition.
• There is no air leakage from air ducts.
• Condenser fins are clean.
• HVAC air filter is not clogged with dirt and dust.
• Battery voltage is 12 V or more.
• Radiator cooling fan operates normally.

2) Make sure that high pressure valve (1) and low 

pressure valve (2) of manifold gauge (3) are firmly 
closed.

3) Connect high pressure charging hose (4) to high 

pressure service valve (5) on vehicle, and connect 
low pressure charging hose (6) to low pressure 
service valve (7) on vehicle.

4) Bleed the air in charging hoses by loosening their 

respective nuts on manifold gauge, utilizing the 
refrigerant pressure. When a hiss is heard, 
immediately tighten nut.

WARNING

!

 

Make sure to connect high and low pressure 
charging hoses to correct valves. Connecting 
them in the other way around may cause 
charging hoses and refrigerant container to 
burst.

 

5) Warm up engine to normal operating temperature 

(engine coolant temperature at 80 – 90 

°C (176 – 

194 

°F)) and keep it at specified idle speed.

6) Operate A/C at the following conditions.

• A/C switch at ON position
• Blower speed selector at max position
• Air flow selector at “VENT” position
• Temperature selector at max cool position
• Vehicle door at all open
• Air inlet door at recirculation position

7) Wait for ten minutes to stabilize A/C operation.
8) Keep all windows, front doors and engine hood 

open.

9) With about 20 mm (0.8 in.) of dry bulb thermometer 

(1) put right in front of center ventilation louver and a 
wet and dry bulb thermometer (2) near air inlet (3) of 
HVAC unit.

3

7

4

1

2

6

5

I5JB0A720010-01

1

3

2

I5JB0A720011-01

Air Conditioning System:  7B-26

10) 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 defective part referring to the table.

Low side and high side pressure example, gauges should read as follows when ambient temperature is 30 

°C (86 °F)
M16 engine model
Pressure on high pressure gauge (HI): 1150 – 1410 kPa (11.5 – 14.1 kg/cm

2

, 164 – 201 psi)

Pressure on high pressure gauge (LO): 280 – 410 kPa (2.8 – 4.1 kg/cm

2

, 40 – 58 psi)

J20 engine model
Pressure on high pressure gauge (HI): 1300 – 1630 kPa (13.0 – 16.3 kg/cm

2

, 185 – 232 psi)

Pressure on high pressure gauge (LO): 250 – 370 kPa (2.5 – 3.7 kg/cm

2

, 36 – 53 psi)

F9Q engine model
Pressure on high pressure gauge (HI): 1570 – 1970 kPa (15.7 – 19.7 kg/cm

2

, 223 – 280 psi)

Pressure on high pressure gauge (LO): 230 – 330 kPa (2.3 – 3.3 kg/cm

2

, 33 – 47 psi)

NOTE
Pressure registered on gauge varies with ambient temperature. Therefore, use the graphs when 
determining if pressures are normal or not.

 

[A]

[B]

14.2

28.4

Pressure of Lo

Pressure Gauge

22

312.9

2200

0

1

2

3

30

70

30

70

%

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

21

298.7

2100

20

42.7

56.9

71.1

85.3

99.5

113.8

128.0

142.2

151.4

170.6

184.9

199.1

213.3

227.5

241.7

256.0

270.2

284.4

100

200

300

400

500

600

700

800

900

1000

1100

1200

1300

1400

1500

1600

1700

1800

1900

2000

25

30

35

77

86

95

psi

kPa     kg/cm

2

Ambient Temperature

 C
 F

w

Pressure of High Pressure

Gauge

“A”

“B”

“C”

“D”

Acceptab

le r

ange

Humidity

Acceptab

le range

14.2

28.4

Pressure of Lo

Pressure Gauge

22

312.9

2200

0

1

2

3

30

70

30

70

%

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

21

298.7

2100

20

42.7

56.9

71.1

85.3

99.5

113.8

128.0

142.2

151.4

170.6

184.9

199.1

213.3

227.5

241.7

256.0

270.2

284.4

100

200

300

400

500

600

700

800

900

1000

1100

1200

1300

1400

1500

1600

1700

1800

1900

2000

25

30

35

77

86

95

psi

kPa     kg/cm

2

Ambient Temperature

 C
 F

w

Pressure of High Pressure

Gauge

“A”

“B”

“C”

“D”

Humidity

Acceptab

le range

Acceptab

le r

ange

I5JB0A720012-04