Suzuki Grand Vitara JB627. Service manual — part 277
7B-24 Air Conditioning System:
Condition
Possible Cause
Correction
Manifold Gauge
MPa
(kg/cm
2
)
(psi)
Detail
Lo
Hi
0.28 – 0.39
(2.8 – 3.9)
(40 – 55)
1.34 – 1.67
(13.4 – 16.7)
(191 – 237)
Normal condition
—
—
Negative pressure
0.5 – 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 desiccant and
cap with filter.
Evacuate the A/C
system and recharge
with fresh refrigerant.
Normal:
0.28 – 0.39
(2.8 – 3.9)
(40 – 55)
↑ ↓
Abnormal:
Negative pressure
Normal:
1.34 – 1.67
(13.4 – 16.7)
(191 – 237)
↑ ↓
Abnormal:
0.7 – 1.0
(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 desiccant and
cap with filter.
Evacuate A/C system
and recharge with fresh
refrigerant.
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.
Air Conditioning System: 7B-25
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 and
cap with filter.
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
7B-26 Air Conditioning System:
A/C System Symptom Diagnosis
S6JB0B7204009
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”.
Wiring or grounding faulty
Repair as necessary.
ECT sensor faulty
Check ECT sensor referring to “Engine
Coolant Temperature (ECT) Sensor Inspection
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” or “Magnet Clutch
Operating Check”.
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 in Section 1F”.
Radiator cooling fan motor faulty
Check radiator cooling fan motor referring to
“Radiator Cooling Fan Motor On-Vehicle
Inspection 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”.
Air Conditioning System: 7B-27
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” and “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” or “Magnet Clutch
Operating Check”.
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
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