air filter SUZUKI SX4 2006 1.G Service Owner's Manual
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Page 299 of 1556

Downloaded from www.Manualslib.com manuals search engine Engine Mechanical: 1D-17
Engine Assembly Removal and InstallationS6RW0D1406013
Removal
1) Relieve fuel pressure according to “Fuel Pressure
Relief Procedure in Section 1G”.
2) Disconnect negative and positive cable at battery.
3) Disconnect ECM connectors.
4) Remove battery and battery tray with ECM.
5) Remove right and left side engine under covers.
6) Remove A/C compressor belt by referring to
“Compressor Drive Belt Removal and Installation in
Section 7B” or “Compressor Drive Belt Removal and
Installation in Section 7B”.
7) Drain engine oil referring to “Engine Oil and Filter
Change in Section 0B”.
8) Drain transaxle oil referring to “Manual Transaxle Oil
Change in Section 5B” or “A/T Fluid Change in
Section 5A”.
9) Drain transfer oil referring to “Transfer Oil Change in
Section 3C”.
10) Drain coolant referring to “Cooling System Draining
in Section 1F”
11) Remove air cleaner assembly referring to “Air
Cleaner Assembly Removal and Installation”.
12) With hose connected, detach A/C compressor from
its bracket referring to “Compressor Assembly
Removal and Installation in Section 7B” or
“Compressor Assembly Removal and Installation in
Section 7B”.
CAUTION!
Suspend removed A/C compressor at a place
where no damage will be caused during
removal and installation of engine assembly.
13) Remove cylinder upper cover (1).14) Disconnect the following electric wires/connectors
and each clamps.
• TP sensor (1)
• MAP sensor (2)
• ECT sensor (3)
•EGR valve (4)
• CMP sensor (5)
• Ignition coil assembly (6)
• Injector (7)
•HO2S (8)
• Oil control valve (9) (for engine with VVT system)
• Engine oil pressure switch (10)
• CKP sensor (12)
• Knock sensor (13)
• Generator (14)
• Starting motor (15)
• Ground terminal (16) from cylinder block
• Battery ground cable (17) from transaxle
• Back-up light switch (18) (for M/T model)
• Torque sensor (19)
• P/S motor (20)
• Output shaft speed sensor (VSS) (29) (for A/T
model)
• Solenoid valve (30) (for A/T model)
• Transmission range sensor (31) (for A/T model)
• Input shaft speed sensor (32) (for A/T model)
15) Disconnect the following cables, and remove control
cable bracket (23)
• Gear select control cable (21) (for M/T model)
• Gear shift control cable (22) (for M/T model)
• A/T select cable (33) (for A/T model)
16) Disconnect the following hoses.
• Brake booster hose (24) from intake manifold
• Radiator inlet and outlet hoses (25) from radiator
• Heater inlet and outlet hoses (26) from heater
core
• Fuel feed hose (27) from fuel feed pipe
• Fuel vapor hose (11) from fuel vapor pipe
• Clutch hose (28) from transaxle (for M/T model)
• A/T fluid cooler hoses (for A/T model)
F: Vehicle forward 8. Engine front mounting bracket : 55 N⋅m (5.5 kgf-m, 40.0 lb-ft)
1. Engine right mounting bracket 9. Engine front mounting
: Be sure to direct yellow mark to forward.: 95 N⋅m (9.5 kgf-m, 69.0 lb-ft)
2. Engine right mounting 10. Transfer : 65 N⋅m (6.5 kgf-m, 47.0 lb-ft)
3. Engine left mounting bracket 11. Suspension frame : 25 N⋅m (2.5 kgf-m, 18.0 lb-ft)
1
I5RW0A140009-01
Page 303 of 1556

Downloaded from www.Manualslib.com manuals search engine Engine Mechanical: 1D-21
12) Install oil pressure switch bracket (1).
13) Connect right and left drive shaft joints to differential
gear referring to “Front Drive Shaft Assembly
Removal and Installation in Section 3A”.
14) Install suspension control arm referring to
“Suspension Control Arm / Bushing Removal and
Installation in Section 2B”.
15) Install cylinder upper cover (1).16) Install A/C compressor to its bracket (if equipped)
referring to “Compressor Assembly Removal and
Installation in Section 7B” or “Compressor Assembly
Removal and Installation in Section 7B”.
17) Adjust A/C compressor drive belt referring to
“Compressor Drive Belt Removal and Installation in
Section 7B” or “Compressor Drive Belt Removal and
Installation in Section 7B”.
18) Install air cleaner assembly referring to “Air Cleaner
Assembly Removal and Installation”.
19) Check to ensure that all removed parts are back in
place. Reinstall any necessary parts which have not
been reinstalled.
20) Refill cooling system with coolant referring to
“Cooling System Flush and Refill in Section 1F”.
21) Refill engine with engine oil referring to “Engine Oil
and Filter Change in Section 0B”.
22) Refill transaxle oil referring to “Manual Transaxle Oil
Change in Section 5B” or “A/T Fluid Change in
Section 5A”.
23) Refill transfer oil referring to “Transfer Oil Change in
Section 3C”.
24) Install battery and battery tray with ECM.
25) Connect ECM wire harness.
26) Connect positive and negative cable at battery.
27) Install right and left side engine under covers.
28) Verify that there is no fuel leakage, coolant leakage,
oil leakage and exhaust gas leakage at each
connection.
2. Exhaust manifold
1
2
I5RW0A140011-01
1
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Page 358 of 1556

Downloaded from www.Manualslib.com manuals search engine 1E-2 Engine Lubrication System:
Diagnostic Information and Procedures
Oil Pressure CheckS6RW0D1504001
WARNING!
To avoid the danger of being burned, do not
touch the exhaust system when the system is
hot. Any service on the exhaust system
should be performed when the system is
cool.
NOTE
Prior to checking oil pressure, check the
following.
• Oil level in oil pan
If oil level is low, add oil up to full level
mark (hole) (1) on oil level gauge referring
to “Engine Oil and Filter Change in Section
0B”.
• Oil quality
If oil is discolored or deteriorated, change
it. For particular oil to be used, refer to
“Engine Oil and Filter Change in Section
0B”.
• Oil leaks
If leak is found, repair it.
1) Disconnect oil pressure switch coupler (1).
2) Remove oil pressure switch (2) from cylinder block.3) Install special tools (oil pressure gauge) to vacated
threaded hole of oil pressure switch.
Special tool
(A): 09915–77310
(B): 09915–78211
4) Start engine and warm engine up to normal
operating temperature.
NOTE
Be sure to shift transaxle gear shift lever in
“Neutral”, set parking brake and block drive
wheels.
5) After warming up, raise engine speed to 4,000 r/min.
and measure oil pressure.
Oil pressure specification
More than 270 kPa (2.7 kgf/cm2, 39.8 psi) at 4,000
r/min. (rpm)
6) After checking oil pressure, stop engine and remove
oil pressure gauge and attachment.
7) Before reinstalling oil pressure switch (2), be sure to
wrap its screw threads with sealing tape (1) and
tighten switch to specified torque.
NOTE
If sealing tape edge is bulged out from screw
threads of switch, cut it off.
Tightening torque
Oil pressure switch (a): 13 N·m (1.3 kgf-m, 9.5
lb-ft)
2. Low level mark (hole)
I2RH0B150002-01
I2RH0B150003-01
I2RH0B150004-01
I2RH0B150005-01
Page 666 of 1556

Downloaded from www.Manualslib.com manuals search engine 5A-18 Automatic Transmission/Transaxle:
Step 2. DTC / Freeze Frame Data Check, Record and
Clearance
First, referring to “DTC Check”, check DTC and pending
DTC. If DTC exists, print or write down DTC and freeze
frame data and then clear malfunction DTC(s) by
referring to “DTC Clearance”. Malfunction DTC indicates
malfunction in the system but it is not possible to know
from it whether the malfunction is occurring now or it
occurred in the past and normal condition has been
restored. In order to know that, check symptom in
question according to Step 5 and then recheck DTC
according to Step 6.
Diagnosing a trouble based on the DTC in this step only
or failure to clear the DTC in this step may result in an
faulty diagnosis, trouble diagnosis of a normal circuit or
difficulty in troubleshooting which is otherwise
unnecessary.
Step 3 and 4. Visual Inspection
As a preliminary step, be sure to perform visual check of
the items that support proper function of the engine and
automatic transaxle referring to “Visual Inspection”.
Step 5. Trouble Symptom Confirmation
Check trouble symptoms based on information obtained
in “Step 1. Customer Complaint Analysis: ” and “Step 2.
DTC / Freeze Frame Data Check, Record and
Clearance: ”.
Also, reconfirm DTC according to “DTC Confirmation
Procedure” described in each DTC flow.
Step 6 and 7. Rechecking and Record of DTC and
Freeze Frame Data
Refer to “DTC Check” for checking procedure.Step 8. A/T Basic Check and A/T Symptom
Diagnosis
Perform basic check of A/T according to “A/T Basic
Check” first. When the end of the flow has been reached,
check the parts of the system suspected as a possible
cause referring to “A/T Symptom Diagnosis” and based
on symptoms appearing on the vehicle (symptoms
obtained through steps of customer complaint analysis,
trouble symptom confirmation and/or A/T basic check)
and repair or replace faulty parts, if any.
Step 9. Troubleshooting for DTC
Based on the DTC indicated in Step 6 / 7 and referring to
“applicable DTC flow”, locate the cause of the trouble,
namely in a sensor, switch, wire harness, connector,
actuator, TCM or other part and repair or replace faulty
parts.
Step 10. Check for Intermittent Problem
Check parts where an intermittent trouble is easy to
occur (e.g. wire harness, connector, etc.), referring to
“Intermittent and Poor Connection Inspection in Section
00” and related circuit of DTC recorded in Step 2.
Step 11. Final Confirmation Test
Confirm that the problem symptom has gone and the
vehicle is free from any abnormal conditions. If what has
been repaired is related to the malfunction DTC, clear
the DTC once and check to ensure that no malfunction
DTC is indicated.
Visual InspectionS6RW0D5104002
Visually check the following parts and systems.
Inspection item Referring
• A/T fluid ----- level, leakage, color “Automatic Transaxle Fluid Level Inspection in
Section 0B”
• A/T fluid hoses ----- disconnection, looseness, deterioration “A/T Fluid Cooler Hoses Replacement”
• Throttle cable (if equipped) ----- play (under warm engine),
installation
• A/T select cable ----- installation “Select Cable Removal and Installation”
• Engine oil ----- level, leakage “Engine Oil and Filter Change in Section 0B”
• Engine coolant ----- level, leakage “Engine Coolant Change in Section 0B”
• Engine mountings ----- play, looseness, damage “Engine Assembly Removal and Installation in
Section 1D”
• Suspension ----- play, looseness “Suspension, Wheels and Tires Symptom
Diagnosis in Section 2A”
• Drive shafts ----- damage “Front Drive Shaft Assembly On-Vehicle Inspection
in Section 3A”
• Battery ----- indicator condition, corrosion of terminal “Battery Inspection in Section 1J”
• Connectors of electric wire harness ----- disconnection, friction “Electronic Shift Control System Components
Location”
• Fuses ----- burning
• Parts ----- installation, damage
• Bolts ----- looseness
• Other parts that can be checked visually
Page 925 of 1556

Downloaded from www.Manualslib.com manuals search engine Table of Contents 7- i
7
Section 7
CONTENTS
HVAC
Precautions ................................................. 7-1
Precautions............................................................. 7-1
Precautions on HVAC ........................................... 7-1
Heater and Ventilation............................. 7A-1
General Description ............................................. 7A-1
Heater and Ventilation Construction ................... 7A-1
Schematic and Routing Diagram ........................ 7A-2
Heater and Ventilation Wiring Circuit Diagram .... 7A-2
Component Location ........................................... 7A-2
Electronic Control System Components
Location ............................................................ 7A-2
Diagnostic Information and Procedures ............ 7A-3
Heater and Ventilation Symptom Diagnosis........ 7A-3
Repair Instructions .............................................. 7A-4
HVAC Unit Components ..................................... 7A-4
HVAC Unit Removal and Installation (Non-A/
C) ...................................................................... 7A-4
Blower Motor Removal and Installation............... 7A-4
Blower Motor Inspection ..................................... 7A-4
Blower Motor Resistor Removal and
Installation ......................................................... 7A-5
Blower Motor Resistor Inspection ....................... 7A-5
Blower Motor Relay Inspection ........................... 7A-6
HVAC Control Unit Components ......................... 7A-6
HVAC Control Unit Removal and Installation ...... 7A-7
Blower Speed Selector Inspection ...................... 7A-9
Air Intake Selector Inspection ............................. 7A-9
Air Intake Control Actuator Removal and
Installation ......................................................... 7A-9
Air Intake Control Actuator Inspection .............. 7A-10
Center Ventilation Louver Removal and
Installation ....................................................... 7A-11
Side Ventilation Louver Removal and
Installation ....................................................... 7A-11
Rear Duct Removal and Installation (If
Equipped)........................................................ 7A-12
HVAC Air Filter Removal and Installation (If
Equipped)........................................................ 7A-12
HVAC Air Filter Inspection (If Equipped) ........... 7A-12
Air Conditioning System......................... 7B-1
Manual Type ............................................................ 7B-1
Precautions........................................................... 7B-1A/C System Caution ............................................ 7B-1
Precautions on Servicing A/C System ................ 7B-1
General Description .............................................7B-2
Sub-Cool A/C System Description ...................... 7B-2
Manual A/C Electronic Input Output Table .......... 7B-3
A/C Operation Description at ECM ..................... 7B-3
Schematic and Routing Diagram ........................7B-4
A/C System Air Flow Diagram............................. 7B-4
A/C System Wiring Diagram ............................... 7B-5
Component Location ...........................................7B-6
A/C System Major Components Location ........... 7B-6
Electronic Control System Components
Location............................................................. 7B-7
Diagnostic Information and Procedures ............7B-8
A/C System Performance Inspection .................. 7B-8
Trouble Diagnosis for Abnormal Pressure ........ 7B-11
A/C System Inspection at ECM ......................... 7B-12
A/C System Symptom Diagnosis ...................... 7B-13
Abnormal Noise Symptom Diagnosis of A/C
System ............................................................ 7B-15
Repair Instructions ............................................7B-17
Operation Procedure for Refrigerant Charge .... 7B-17
Condenser Cooling Fan Removal and
Installation ....................................................... 7B-22
Condenser Cooling Fan Inspection ................... 7B-23
Condenser Assembly On-Vehicle Inspection .... 7B-23
Condenser Assembly Removal and
Installation ....................................................... 7B-23
Desiccant Removal and Installation .................. 7B-24
HVAC Unit Components ................................... 7B-25
HVAC Unit Removal and Installation ................ 7B-26
Evaporator Inspection ....................................... 7B-27
Evaporator Temperature Sensor Removal
and Installation ................................................ 7B-27
Evaporator Temperature Sensor Inspection ..... 7B-28
Expansion Valve Removal and Installation ....... 7B-28
Expansion Valve Inspection .............................. 7B-28
A/C Refrigerant Pressure Sensor and Its
Circuit Inspection............................................. 7B-29
A/C Refrigerant Pressure Sensor Removal
and Installation ................................................ 7B-29
A/C Switch Inspection ....................................... 7B-29
A/C System Relay Inspection............................ 7B-30
Compressor Drive Belt Inspection and
Adjustment ...................................................... 7B-30
Page 940 of 1556

Downloaded from www.Manualslib.com manuals search engine 7A-12 Heater and Ventilation:
Rear Duct Removal and Installation (If
Equipped)
S6RW0D7106016
Removal
1) Disconnect negative (–) cable at battery.
2) Remove front seats referring to “Front Seat Removal
and Installation in Section 9G”.
3) Remove console box referring to “Console Box
Components in Section 9H”.
4) Take off carpet till rear ducts is totally exposed.
5) Remove right and left rear ducts.
6) Remove center rear duct as follows, if necessary.
a) Remove HVAC control unit referring to “HVAC
Control Unit Removal and Installation” (non-A/C
or manual A/C) or “HVAC Control Module
Removal and Installation in Section 7B” (auto A/
C).
b) Remove center rear duct from HVAC unit.
Installation
Reverse removal procedure noting the following
instructions.
• Install HVAC control unit referring to “HVAC Control
Unit Removal and Installation” (non-A/C or manual A/
C) or “HVAC Control Module Removal and Installation
in Section 7B” (auto A/C), if removed.
• Install console box referring to “Console Box
Components in Section 9H”.
• Install front seats referring to “Front Seat Removal
and Installation in Section 9G”.
HVAC Air Filter Removal and Installation (If
Equipped)
S6RW0D7106017
Removal
1) Remove glove box from instrument panel.
2) Remove air filter (1) from HVAC unit while releasing
claws (2).
Installation
Reverse removal procedure noting the following
instructions.
• Position air filter by directing its arrow mark to the
upward.
HVAC Air Filter Inspection (If Equipped)S6RW0D7106018
Reference: “HVAC Air Filter Removal and Installation (If
Equipped)”
Check that filter is not excessively dirty, damage or oily,
clean filter with compressed air from air outlet side of
filter. If abnormality is found, replace filter with new one.
1. Center rear duct 4. Clip
2. Right rear duct 5. HVAC unit
3. Left rear duct
324 5
1
4
I7RW01710019-01
12
2
I6RW0C710010-01
I6RW0C710009-01
I4RS0A710032-01
Page 942 of 1556

Downloaded from www.Manualslib.com manuals search engine 7B-2 Air Conditioning System: Manual Type
Refrigerant Recovery
When discharging refrigerant out of A/C system, always recover it by using refrigerant recovery and recycling
equipment because discharging refrigerant HFC-134a (R-134a) into atmosphere would cause adverse effect to
environments referring to “Recovery” in “Operation Procedure for Refrigerant Charge”.
Refrigerant Charge
After performing compressor oil replenishment and evacuation, charge a proper amount of refrigerant to A/C system
referring to “Charge” in “Operation Procedure for Refrigerant Charge”.
General Description
Sub-Cool A/C System DescriptionS6RW0D7211001
In the sub-cool A/C system (condenser integrated with receiver / dryer), the inside of the condenser is divided into the
condensation part and the sub-cooler part, and the receiver / dryer is located between those. In the receiver / dryer,
the refrigerant is separated into the vapor refrigerant and the liquid refrigerant. Only the liquid refrigerant is delivered to
the sub-cooler part of the condenser. The refrigerant is supercooled by the sub-cooler part of the condenser.
I5RW0A721003-02
[A]: Liquid 2. Magnet clutch 6. Expansion valve 10. Desiccant
[B]: Vapor 3. Condenser 7. A/C evaporator 11. Filter
[C]: Superheated vapor 4. Receiver/dryer 8. Condensation part 12. Vapor refrigerant
1. Compressor 5. Refrigerant pressure sensor 9. Sub-cooler part 13. Liquid refrigerant
Page 948 of 1556

Downloaded from www.Manualslib.com manuals search engine 7B-8 Air Conditioning System: Manual Type
Diagnostic Information and Procedures
A/C System Performance InspectionS6RW0D7214001
1) Confirm that vehicle and environmental conditions
are as follows.
• Vehicle is put indoors.
• Ambient temperature is within 25 – 35 °C (77 – 95
°F).
• Relative humidity is within 30 – 70%.
• There is no wind indoors.
• HVAC unit is normal.
• Blower motor is normal.
• There is no air leakage from air ducts.
• Condenser fins are clean.
• HVAC air filter is not clogged with dirt and dust (if
equipped).
• Battery voltage is about 12 V.
• Radiator cooling fan operates normally.
2) Make sure that high pressure valve (1) and low
pressure valve (2) of manifold gauge are firmly
closed.
3) Connect high pressure charging hose (3) to high
pressure service valve (5) on vehicle and low
pressure charging hose (4) to low pressure service
valve (6).
4) Bleed the air in charging hoses (3) and (4) by
loosening their nuts respectively utilizing the
refrigerant pressure. When a hissing sound is heard,
immediately tighten nut.
CAUTION!
Do not connect high and low pressure
charging hoses in reverse.
5) Warm up engine to the normal operating
temperature and keep it at the specified idle speed.
6) Turn A/C switch ON, set blower speed selector at
maximum speed position, temperature selector at
maximum cold position, air flow selector at face
position, and air intake selector at recirculation
position. (Confirm that A/C compressor, A/C
condenser cooling fan and radiator cooling fan are
working.)
7) Wait for ten minutes to stabilize the A/C operation.
8) Open all door windows, front doors and engine hood.
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 of
HVAC unit.
321
4
6
5
I7RW01721006-01
2
1
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Page 951 of 1556

Downloaded from www.Manualslib.com manuals search engine Air Conditioning System: Manual Type 7B-11
Thermometer at center ventilation louver
Trouble Diagnosis for Abnormal PressureS6RW0D7214002
NOTE
Normal pressure values on high side and low side in following table are measured when the ambient
temperature is 30 °C. As normal pressure values on high side and low side vary depending on the
ambient temperature, be sure to perform following steps first when diagnosing troubles.
1. Measure the ambient temperature and using that value, read the normal value from the graph given
in Step 10 of “A/C System Performance Inspection”.
2. Put that value in place of the normal pressure in following table.
Condition Possible cause Correction
Crossing point is higher
than acceptable range
(“E” area)Insufficient or excessive charge of refrigerant Check refrigerant pressure.
Dirty or bent A/C evaporator fins Clean or repair.
Air leakage from cooling (heater) unit or air duct Repair or replace.
Malfunctioning, switch over function of door in
cooling (heater) unitRepair or replace.
Compressor malfunction Check compressor.
Crossing point is lower
than acceptable range
(“F” area)Insufficient air volume from center duct (Heater
blower malfunction)Check blower motor and fan.
Compressor malfunction Check compressor.
Condition
Possible cause Correction Manifold gauge MPa (kgf/cm2) (psi)
Detail
Lo Hi
0.27 – 0.39
(2.7 – 3.9)
(38.8 – 56.0)1.13 – 1.56
(11.4 – 15.6)
(162.3 – 221.8)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.Replace expansion
valve.
Replace desiccant and
cap with filter.
Evacuate the A/C
system and recharge
with fresh refrigerant.
Normal:
0.27 – 0.39
(2.7 – 3.9)
(38.8 – 56.0)
↑ ↓
Abnormal:
Negative pressureNormal:
1.13 – 1.56
(11.4 – 15.6)
(162.3 – 221.8)
↑ ↓
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.
Page 952 of 1556

Downloaded from www.Manualslib.com manuals search engine 7B-12 Air Conditioning System: Manual Type
A/C System Inspection at ECMS6RW0D7214003
When checking voltage at ECM terminals related to A/C system, refer to “Inspection of ECM and Its Circuits in Section
1A”.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 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.
0.40 – 0.45
(4.0 – 4.5)
(57 – 64)2.0 – 2.5
(20 – 25)
(285 – 355)High pressure reading on
both low and high
pressure sides.Overcharged A/C
system.Adjust refrigerant to
specified amount.
Faulty condenser
cooling operation.Clean condenser.
Faulty condenser
cooling fan operation.Inspect and repair
condenser cooling 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 (kgf/cm
2) (psi)
Detail
Lo Hi