Suzuki Grand Vitara JB627. Manual — part 278
7B-28 Air Conditioning System:
Abnormal Noise Diagnosis
S6JB0B7204010
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
S6JB0B7204011
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” or “Magnet Clutch
Operating Check”.
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” and “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” and “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.
Air Conditioning System: 7B-29
Abnormal Noise from Magnetic Clutch
Abnormal Noise from Tubing
Abnormal Noise from Condenser Assembly
Abnormal Noise from Crankshaft Pulley
Abnormal Noise from Tension Pulley
Abnormal Noise from A/C Evaporator
Abnormal Noise from Blower Motor
Condition
Possible cause
Correction / Reference Item
A rumbling noise is heard
when compressor is not
in operation
Worn or damaged bearings
Replace magnet clutch assembly.
A chattering noise is
heard when compressor
is in operation
Faulty magnet clutch clearance
(excessive clearance)
Adjust magnet clutch clearance.
Worn magnet clutch friction surface
Replace magnet clutch assembly.
Compressor oil leaked from shaft seal,
contaminating the friction surface
Replace compressor body assembly.
Condition
Possible cause
Correction / Reference Item
A droning noise is heard
from inside of the vehicle,
but not particularly
noticeable in engine
compartment
Faulty tubing clamps
Reposition clamps or increase the number of
clamps.
Resonance caused by pulsation from
variations in refrigerant pressure
Attach a silencer to tubing, or modify its
position and length.
Condition
Possible cause
Correction / Reference Item
Considerable vibration in
condenser assembly
Resonance from condenser assembly
bracket and body
Firmly insert a silencer between condenser
assembly bracket and body.
Condition
Possible cause
Correction / Reference Item
A large rattling noise is
heard at idle or sudden
acceleration
Loosen crankshaft pulley bolt
Retighten bolt.
Condition
Possible cause
Correction / Reference Item
Clattering noise is heard
from pulley
Worn or damaged bearing
Replace tension pulley.
Pulley cranks upon
contact
Cracked or loose bracket
Replace or retighten bracket.
Condition
Possible cause
Correction / Reference Item
Whistling sound is heard
from A/C evaporator
Depending on the combination of the
interior / exterior temperatures, engine
rpm and refrigerant pressure, the
refrigerant flowing out of the expansion
valve may, under certain conditions,
make a whistling sound
At times, slightly decreasing refrigerant volume
may stop this noise.
Inspect expansion valve and replace if faulty.
Condition
Possible cause
Correction / Reference Item
Blower motor emits a
chirping sound in
proportion to its speed of
rotation
Worn or damaged motor brushes or
commutator
Replace blower motor.
Fluttering noise or large
droning noise is heard
from blower motor
Leaves or other debris introduced from
fresh air inlet to blower motor
Remove debris and make sure that the screen
at fresh air inlet is intact.
7B-30 Air Conditioning System:
DTC B1502: Inside Air Temperature Sensor and/or Its Circuit Malfunction
S6JB0B7204012
Wiring Diagram
DTC Detecting Condition and Trouble Area
DTC Confirmation Procedure
1) Connect scan tool to DLC with ignition switch turned OFF.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Check DTC.
DTC Troubleshooting
NOTE
When DTC B1503, B1511, B1512 and B1530 are indicated together, it is possible that “BLK/RED” wire
circuit open.
5V
BLU/BLK
G52-20
G52-13
BLK/RED
[A]
2
3
1
13
20
I5JB0A720020-01
[A]: HVAC control module connector “G52” (harness side view)
2. Inside air temperature sensor
1. HVAC control module
3. To other sensors
DTC Detecting Condition
Trouble Area
Inside air temperature sensor signal voltage is more than or less than
specified value for specified time continuously.
• Inside air temperature sensor circuit
• Inside air temperature sensor
• HVAC control module
Step
Action
Yes
No
1
Inside air temperature sensor signal circuit check
1) Disconnect inside air temperature sensor connector with
ignition switch turned OFF.
2) Check for proper connection to inside air temperature
sensor at “BLU/BLK” and “BLK/RED” wire terminals.
3) If OK, measure voltage between “BLU/BLK” wire
terminal of inside air temperature sensor connector and
vehicle body ground with ignition switch turned ON.
Is voltage 4 – 6 V?
Go to Step 5.
Go to Step 2.
2
Inside air temperature sensor signal circuit check
1) Disconnect connector from HVAC control module with
ignition switch turned OFF.
2) Check for proper connection to HVAC control module
connector at “G52-20” and “G52-13” terminals.
3) If OK, measure resistance between “BLU/BLK” wire
terminal of inside air temperature sensor connector and
“G52-20” terminal of HVAC control module connector.
Is resistance below 5
Ω
?
Go to Step 3.
“BLU/BLK” wire open or
high resistance circuit.
3
Inside air temperature sensor signal circuit check
1) Measure resistance between “BLU/BLK” wire terminal of
inside air temperature sensor connector and vehicle
body ground.
Is resistance infinity?
Go to Step 4.
“BLU/BLK” wire shorted
to ground circuit.
Air Conditioning System: 7B-31
DTC B1503: A/C Evaporator Air Temperature Sensor and/or Its Circuit Malfunction
S6JB0B7204013
Wiring Diagram
DTC Detecting Condition and Trouble Area
DTC Confirmation Procedure
1) Connect scan tool to DLC with ignition switch turned OFF.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Check DTC.
4
Inside air temperature sensor signal circuit check
1) Measure voltage between “BLU/BLK” wire terminal of
inside air temperature sensor connector and vehicle
body ground with ignition switch turned ON.
Is voltage 0 V?
Go to Step 5.
“BLU/BLK” wire shorted
to other circuit.
5
Inside air temperature sensor ground circuit check
1) Connect HVAC control module connector with ignition
switch turned OFF.
2) Measure resistance between “BLK/RED” wire terminal of
inside air temperature sensor connector and vehicle
body ground.
Is resistance below 5
Ω
?
Go to Step 7.
Go to Step 6.
6
Inside air temperature sensor ground circuit check
1) Measure resistance between “G52-13” terminal of HVAC
control module connector and vehicle body ground.
Is resistance below 5
Ω
?
“BLK/RED” wire open or
high resistance circuit.
HVAC control module
faulty.
7
Inside air temperature sensor check
1) Check inside air temperature sensor referring to “Inside
Air Temperature Sensor Inspection”.
Is it in good condition?
HVAC control module
faulty.
Inside air temperature
sensor faulty.
Step
Action
Yes
No
5V
BLK/RED
WHT/BLK
G52-19
G52-13
[A]
2
3
1
13
19
I5JB0A720021-01
[A]: HVAC control module connector “G52” (harness side view)
2. Evaporator temperature sensor
1. HVAC control module
3. To other sensors
DTC Detecting Condition
Trouble Area
Evaporator temperature sensor signal voltage is more than or less than
specified value for specified time continuously.
• Evaporator temperature sensor
circuit
• Evaporator temperature sensor
• HVAC control module
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