Suzuki GRAND VITARA 2005 Service Manual page 519

Manifold Gauge (kg/cm
Lo
0.35 – 0.45
(3.5 – 4.5)
(50 – 64)
2.0 – 2.5
(20 – 25)
(285 – 355)
0.45 – 0.55
(4.5 – 5.5)
(64 – 78)
A/C System Symptom Diagnosis
Condition
No cool air comes out (A/
C system does not
operate)
Condition
MPa
2 )
Detail
(psi)
Hi
High pressure reading on
both low and high pressure
sides.
High pressure reading on
both low and high pressure
sides.
Low pressure side tubing is
not cold when touched.
High pressure reading on
both low and high pressure
sides.
Large amount of frost or
dew on the low pressure
side tubing.
Possible cause
No refrigerant
Fuse blown
Evaporator temperature sensor faulty
A/C refrigerant pressure sensor faulty
Wiring or grounding faulty
ECT sensor faulty
ECM faulty
HVAC control module faulty
Magnet clutch faulty
Compressor drive belt loosened or
broken
Compressor faulty
Compressor relay faulty
Temperature selector, blower speed
selector, and/or air flow selector faulty
BCM faulty
Air Conditioning System:
Possible Cause
Overcharged A/C
system.
Faulty condenser
cooling operation.
Faulty radiator fan
operation.
Presence of air in A/C
system. (Improperly
evacuated)
Faulty expansion valve.
Refrigerant flow is not
regulated properly.
Correction / Reference Item
Perform recovery, evacuation and charge
referring to "Operation Procedure for Charging
A/C with Refrigerant: ".
Check related fuses, and then check for short
circuit to ground.
Check evaporator temperature sensor
referring to "A/C Evaporator Temperature
Sensor Inspection: in related manual".
Check A/C refrigerant pressure sensor
referring to "A/C Refrigerant Pressure Sensor
and Its Circuit Inspection: ".
Repair as necessary.
Check ECT sensor referring to "Engine
Coolant Temperature (ECT) Sensor
Inspection: in Section 1C".
Check ECM.
Check HVAC control module referring to
"HVAC Control Module and Its Circuits
Inspection: in related manual".
Check magnet clutch referring to "Magnet
Clutch Operating Check: ".
Adjust or replace drive belt.
Check compressor.
Check compressor relay referring to "A/C
Compressor Relay Inspection: ".
Check HVAC control module referring to
"HVAC Control Module and Its Circuits
Inspection: in related manual".
Check BCM referring to "Inspection of BCM
and its Circuits: in Section 10B".
7B-14
Correction
Adjust refrigerant to
specified amount.
Clean condenser.
Inspect and repair
radiator fan.
Replace desiccant.
Inspect quantity of
compressor oil and
presence of
contaminants in oil.
Evacuate system and
recharge with fresh
refrigerant.
Replace expansion
valve.
S5JB0B7204009