Suzuki Grand Vitara JB416 / JB420 / JB419. Manual — part 385

7B-31 Air Conditioning System:

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 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.

M16 engine model

0.35 – 0.45

(3.5 – 4.5)

(50 – 64)

J20 engine model

0.33 – 0.45

(3.3 – 4.5)

(47 – 64)

F9Q engine model

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.

Overcharged A/C
system.
Faulty condenser
cooling operation.
Faulty radiator fan
operation.

Adjust refrigerant to
specified amount.
Clean condenser.
Inspect and repair
radiator 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.
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

(kg/cm

2

)

(psi)

Detail

Lo

Hi

Air Conditioning System: 7B-32

A/C System Symptom Diagnosis

S6JB0A7204009

Condition

Possible cause

Correction / Reference Item

No cool air comes out (A/
C system does not
operate)

No refrigerant

Perform recovery, evacuation and charge
referring to “Operation Procedure for Charging
A/C with Refrigerant”.

Fuse blown

Check related fuses, and then check for short
circuit to ground.

Evaporator temperature sensor faulty

Check evaporator temperature sensor
referring to “A/C Evaporator Temperature
Sensor Inspection”.

A/C refrigerant pressure sensor faulty

Check A/C refrigerant pressure sensor
referring to “A/C Refrigerant Pressure Sensor
and Its Circuit Inspection (Petrol Engine
Model)”.

Wiring or grounding faulty

Repair as necessary.

ECT sensor faulty

Check ECT sensor referring to “Engine
Coolant Temperature (ECT) Sensor
Inspection: For Petrol Engine Model in Section
1C”.

ECM faulty

Check ECM referring to “A/C System
Inspection at ECM”.

HVAC control module faulty

Check HVAC control module referring to
“HVAC Control Module and Its Circuits
Inspection”.

Magnet clutch faulty

Check magnet clutch referring to “Magnet
Clutch Operating Check for M16 Engine
Model”, “Magnet Clutch Operating Check for
J20 Engine Model” or
“Magnet Clutch
Operating Check (F9Q Engine Model)”
.

Compressor drive belt loosened or
broken

Adjust or replace drive belt.

Compressor faulty

Check compressor.

Compressor relay faulty

Check compressor relay referring to “A/C
Compressor Relay Inspection”
.

Temperature selector, blower speed
selector, and/or air flow selector faulty

Check HVAC control module referring to
“HVAC Control Module and Its Circuits
Inspection”.

BCM faulty

Check BCM referring to “Inspection of BCM
and Its Circuits in Section 10B”.

No cool air comes out
(radiator cooling fan
motor does not operate)

Fuse blown

Check related fuses, and then check for short
circuit to ground.

Wiring or grounding faulty

Repair as necessary.

Radiator cooling fan motor relay faulty

Check radiator cooling fan motor relay
referring to “Radiator Cooling Fan Relay
Inspection: For Petrol Engine Model in Section
1F”.

Radiator cooling fan motor faulty

Check radiator cooling fan motor referring to
“Radiator Cooling Fan Motor On-Vehicle
Inspection: For Petrol Engine Model in Section
1F”.

ECM faulty

Check ECM referring to “A/C System
Inspection at ECM”.

HVAC control module faulty

Check HVAC control module referring to
“HVAC Control Module and Its Circuits
Inspection”.

7B-33 Air Conditioning System:

No cool air comes out
(blower motor does not
operate)

Fuse blown

Check related fuses, and then check for short
circuit to ground.

Blower motor controller faulty

Check blower motor controller referring to
“Blower Motor Controller Inspection in Section
7A”.

Blower speed selector faulty

Check blower speed selector referring to
“HVAC Control Module and Its Circuits
Inspection”.

HVAC control module faulty

Check HVAC control module referring to
“HVAC Control Module and Its Circuits
Inspection”.

Wiring or grounding faulty

Repair as necessary.

Blower motor faulty

Check blower motor referring to “Blower Motor
Inspection in Section 7A”.

Blower motor relay faulty

Check blower motor relay referring to “Blower
Motor Relay Inspection in Section 7A”.

Cool air does not come
out or insufficient cooling
(A/C system normal
operation)

Insufficient or excessive charge of
refrigerant

Check the amount of refrigerant and system
for leaks.

Condenser clogged

Check condenser referring to “A/C Condenser
Assembly On-Vehicle Inspection”.

A/C evaporator clogged or frosted

Check A/C evaporator and evaporator
temperature sensor referring to “A/C
Evaporator Inspection” an
d “A/C Evaporator
Temperature Sensor Inspection”.

Evaporator temperature sensor faulty

Check evaporator temperature sensor
referring to “A/C Evaporator Temperature
Sensor Inspection”.

Expansion valve faulty

Check expansion valve referring to “Expansion
Valve On-Vehicle Inspection”.

Desiccant clogged

Check desiccant.

Compressor drive belt loosened or
broken

Adjust or replace drive belt.

Magnet clutch faulty

Check magnet clutch referring to “Magnet
Clutch Operating Check for M16 Engine
Model”, “Magnet Clutch Operating Check for
J20 Engine Model” or
“Magnet Clutch
Operating Check (F9Q Engine Model)”
.

Compressor faulty

Check compressor.

Air in A/C system

Replace desiccant, and then perform
evacuation and charge referring to “Operation
Procedure for Charging A/C with Refrigerant”.

Air leaking from HVAC unit or air duct

Repair as necessary.

Heater and ventilation system faulty

Check HVAC unit.

Temperature selector faulty

Check temperature selector referring to “HVAC
Control Module and Its Circuits Inspection”.

HVAC control module faulty

Check HVAC control module referring to
“HVAC Control Module and Its Circuits
Inspection”.

Temperature control actuator faulty

Check temperature control actuator referring to
“Temperature Control Actuator Inspection”.

Blower motor faulty

Check blower motor referring to “Blower Motor
Inspection in Section 7A”.

Excessive compressor oil in A/C system Drain excessive compressor oil from A/C

system circuit and compressor.

Condition

Possible cause

Correction / Reference Item

Air Conditioning System: 7B-34

Abnormal Noise Diagnosis

S6JB0A7204010

There are various types of noise, ranging from those produced in the engine compartment to those from the
passenger compartment, also from rumbling noises to whistling noises.

Abnormal Noise Symptom Diagnosis of A/C System

S6JB0A7204011

Abnormal Noise from Compressor

Cool air does not come
out only intermittently

Wiring connection faulty

Repair as necessary.

Expansion valve faulty

Check expansion valve referring to “Expansion
Valve On-Vehicle Inspection”.

Excessive moisture in A/C system

Replace desiccant, and then perform
evacuation and charge referring to “Operation
Procedure for Charging A/C with Refrigerant”.

Magnet clutch faulty

Check magnet clutch referring to “Magnet
Clutch Operating Check for M16 Engine
Model”, “Magnet Clutch Operating Check for
J20 Engine Model” or
“Magnet Clutch
Operating Check (F9Q Engine Model)”
.

Excessive amount of refrigerant

Check the amount of refrigerant.

Cool air comes out only at
high speed

Condenser clogged

Check condenser referring to “A/C Condenser
Assembly On-Vehicle Inspection”
.

Insufficient charge of refrigerant

Check the amount of refrigerant and system
for leaks.

Air in A/C system

Replace desiccant, and then perform
evacuation and charge referring to “Operation
Procedure for Charging A/C with Refrigerant”.

Compressor drive belt loosened or
broken

Adjust or replace drive belt.

Compressor faulty

Check compressor.

Cool air does not come
out only at high speed

Excessive amount of refrigerant

Check the amount of refrigerant.

A/C evaporator frosted

Check A/C evaporator and evaporator
temperature sensor referring to “A/C
Evaporator Inspection” an
d “A/C Evaporator
Temperature Sensor Inspection”.

Insufficient air flow of
cooled air

A/C evaporator clogged or frosted

Check A/C evaporator and evaporator
temperature sensor referring to “A/C
Evaporator Inspection” an
d “A/C Evaporator
Temperature Sensor Inspection”.

Air leaking from HVAC unit or air duct

Repair as necessary.

Blower motor faulty

Check blower motor referring to “Blower Motor
Inspection in Section 7A”.

Wiring or grounding faulty

Repair as necessary.

Condition

Possible cause

Correction / Reference Item

Condition

Possible cause

Correction / Reference Item

During compressor
operation, a rumbling
noise is heard
proportional to engine
revolutions

Inadequate clearance in scroll area

Replace compressor.

A loud noise is heard at a
certain rpm,
disproportionately to
engine revolution

Loose or faulty compressor drive belt

Adjust drive belt tension or replace drive belt.

Loose compressor mounting bolts

Retighten mounting bolts.

A loud rattle is heard at
low engine rpm

Loose compressor armature plate bolt

Retighten armature plate bolt.
Replace compressor if it was operated in this
condition for a long time.

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Политика конфиденциальности