Suzuki Grand Vitara JB416 / JB420. Manual - part 282

7B-19 Air Conditioning System:

Scan Tool Data

S5JB0A7204032

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.

)

B1551 Serial communication circuit

malfunction

HVAC control module keeps
condition just before malfunction is
detected.

HVAC control module controls
actuators assuming that as follows.
• Outside air temperature is 20

°C (68

°F).

• Engine coolant temperature is 90

°C

(194

°F).

• Vehicle speed is 0 km/h (0 mph).
• Engine speed is 0 rpm.

)

B1552

)

B1553

CAN communication circuit
malfunction

)

B1556

Camshaft position (CMP)
sensor and/or its circuit
malfunction

HVAC control module keeps
condition just before malfunction is
detected.

HVAC control module controls
actuators assuming that amount of
engine speed is 0 rpm.

)

B1557

Vehicle speed sensor and/
or its circuit malfunction

HVAC control module keeps
condition just before malfunction is
detected.

HVAC control module controls
actuators assuming that amount of
vehicle speed is 0 km/h (0 mph).

)

B1561

Engine coolant temperature
sensor and/or its circuit
malfunction

HVAC control module keeps
condition just before malfunction is
detected.

HVAC control module controls
actuators assuming that amount of
engine coolant temperature is 90

°C

(194

°F).

)

B1562

Outside air temperature
sensor and/or its circuit
malfunction

HVAC control module keeps
condition just before malfunction is
detected.

HVAC control module controls
actuators assuming that amount of
outside air temperature is 20

°C (68

°F).

DTC No.

Trouble Area

Fail-Safe Operation

When ignition switch is turned

ON after malfunction is already

detected

When malfunction is detected

during ignition switch is ON

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

– 4447.8 W/m

)

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)

Air Conditioning System: 7B-20

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: It is computed based on pulse

signals from vehicle speed sensor

ENGINE SPEED: It is computed by signal from CMP

sensor

)

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.

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.

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.

A/C indicator lamp is not lighted.

OFF

)

FRE INDICATOR LAMP

Fresh air (FRE) indicator lamp is lighted.

Fresh air (FRE) indicator lamp is not lighted.

OFF

)

REC INDICATOR LAMP

Recirculation air (REC) indicator lamp is lighted.

Recirculation air (REC) indicator lamp is not lighted.

OFF

)

REAR DEF INDICATOR

Rear defogger indicator lamp is lighted.

Rear defogger indicator lamp is not lighted.

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

7B-21 Air Conditioning System:

Visual Inspection

S5JB0A7204008

Visually check the following parts and systems.

A/C System Performance Inspection

S5JB0A7204027

1) Confirm that vehicle and environmental conditions

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

°C (59 –

°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.
• Are 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.

CAUTION

Do not interchange high and low pressure
charging hoses by mistake.

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

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”.

I5JB0A720010-01

Air Conditioning System: 7B-22

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

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

, 164 – 201 psi)

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

, 40 – 58 psi)

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

, 185 – 232 psi)

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

, 36 – 53 psi)

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

I5JB0A720011-01

[A]

[B]

14.2

28.4

Pressure of Lo

Pressure Gauge

312.9

2200

298.7

2100

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

psi

kPa kg/cm

Ambient Temperature

C
F

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

312.9

2200

298.7

2100

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

psi

kPa kg/cm

Ambient Temperature

C
F

Pressure of High Pressure

Gauge

“A”

“B”

“C”

“D”

Humidity

Acceptab

le range

Acceptab

le r

ange

I5JB0A720012-04

[A]: M16 engine model
[B]: J20 engine model

Content .. 280 281 282 283 ..