O2 sensor NISSAN LATIO 2010 Service Repair Manual

PRECAUTIONSMTC-5
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been shown to be combustible at elevated pressures. These mixtures, if ignited, may cause injury or
property damage. Additional health and safety info rmation may be obtained from refrigerant manu-
facturers.
Oil PrecautionINFOID:0000000005396477
• Use only specified oil for the HFC-134a (R-134a) A/C system and HFC-134a (R-134a) components. If oil
other than that specified is used, comp ressor malfunction is likely to occur.
• The specified HFC-134a (R-134a) oil rapidly absorbs moisture from the atmosphere. The following handling
precautions must be observed:
- When removing refrigerant components from a vehicle, immediately cap (seal) the component to minimize the entry of moisture from the atmosphere.
- When installing refrigerant components to a vehicle, do not remove the caps (unseal) until just before con- necting the components. Connect all refrigerant loop components as quickly as possible to minimize the
entry of moisture into system.
- Only use the specified oil from a sealed container. Imm ediately reseal containers of oil. Without proper seal-
ing, oil will become moisture saturated and should not be used.
• Avoid breathing A/C refrigerant and oil vapor or mist. Exposure may irritate eyes, nose and throat.
Use only approved recovery/recycling equipment to discharge HFC-134a (R-134a) refrigerant. If accidental
system discharge occurs, ventilate work area before resuming service. Additional health and safety informa-
tion may be obtained from refrigerant and oil manufacturers.
• Do not allow A/C oil to come in contact with styrofoam parts. Damage may result.
Precaution for Refrigerant ConnectionINFOID:0000000005396478
A new type refrigerant connection has been introduced to a ll refrigerant lines except the following location.
• Expansion valve to evaporator
• Refrigerant pressure sensor to condenser
FEATURES OF NEW TYPE REFRIGERANT CONNECTION
• The O-ring has been relocated. It has also been provided with a groove for proper installation. This elimi-
nates the chance of the O-ring being caught in, or damaged by, the mating part. The sealing direction of the
O-ring is now set vertically in relation to the contacti ng surface of the mating part to improve sealing charac-
teristics.
• The reaction force of the O-ring will not occur in the direction that causes the joint to pull out, thereby facili- tating piping connections.
O-RING AND REFRIGERANT CONNECTION
SHA815E
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PRECAUTIONSMTC-7
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O-Ring Part Numbers and Specifications
CAUTION:
When replacing or cleaning refrigerant cycle components, observe the following.
• When the compressor is removed, store it in the sam e position as it is when installed on the vehicle.
Doing so will cause oil to en ter the low-pressure chamber.
• When connecting tubes, always use a to rque wrench and a back-up wrench.
• After disconnecting tubes, immediately plug all op enings to prevent entry of dirt and moisture.
• When installing an air conditione r in the vehicle, connect the pipes as the final stage of the opera-
tion. Do not remove the seal caps of pipes and other components until just before required for con-
nection.
• Allow components stored in cool areas to warm to working area temperature before removing seal
caps. This prevents condensation from forming inside A/C components.
• Thoroughly remove moisture from the refrigeration system before charging the refrigerant.
• Always replace used O-rings.
• When connecting tube, apply the speci fied A/C oil to circle of the O-rings. Be careful not to apply oil
to threaded portion. Refer to MTC-96, "
Oil".
• O-ring must be closely attached to dented portion of tube.
• When replacing the O-ring, be careful not to damage O-ring and tube.
• Connect tube until you hear it cl ick, then tighten the nut or bolt by hand until snug. Make sure that
the O-ring is installed to tube correctly.
• After connecting line, perform leak test and make sure that there is no leakage from connections.
When the refrigerant leaking point is found, disconnect that line and replace the O-ring. Then tighten
connections of seal seat to the specified torque.
Precaution for Service of CompressorINFOID:0000000005396479
•Plug all openings to prevent moisture and foreign matter from entering.
Connection typePiping connection point Part number QTY O-ring size
New Condenser to high-pressure flexible hose
92472 N8210 112
Condenser to high-pressure pipe 92471 N8210 18
Low-pressure flexible hose to expansion valve 92473 N8210 116
High-pressure pipe to expansion valve 92471 N8210 18
Compressor to low-pressure flexible hose 92474 N8210 119
Compressor to high-pressure flexible hose 92472 N8210 112
Liquid tank to condenser pipe Inlet
92471 N8210 1
8
Outlet 1
Former Refrigerant pressure sensor to condenser
J2476 89956 110
Expansion valve to evaporator Inlet
92471 N8200 2 12
Outlet 92473 N8200 2 16
RHA861F
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REFRIGERATION SYSTEMMTC-15
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REFRIGERATION SYSTEM
Refrigerant CycleINFOID:0000000005396484
REFRIGERANT FLOW
The refrigerant flows in the standard pattern, that is, through the compressor, the condenser with liquid tank,
through the evaporator, and back to the compressor. T he refrigerant evaporation through the evaporator is
controlled by an externally equalized expansion valve, located inside the evaporator case.
FREEZE PROTECTION
Under usual operating conditions, when the A/C is s witched ON, the compressor runs continuously, and the
evaporator pressure, and temperature is controlled by the compressor to prevent freeze up.
Refrigerant System ProtectionINFOID:0000000005396485
REFRIGERANT PRESSURE SENSOR
The refrigerant system is protected against excessively hi gh or low pressures by the refrigerant pressure sen-
sor, located on the condenser. If the system pressure rises above, or falls below the specifications, the refrig-
erant pressure sensor detects the pressure inside t he refrigerant line and sends the voltage signal to the ECM.
ECM makes the A/C relay go OFF and stops the compressor when pressure on the high-pressure side
detected by refrigerant pressure sensor is over about 2,746 kPa (27.46 bar, 28.0 kg/cm
2 , 398 psi), or below
about 134 kPa (1.34 bar, 1.4 kg/cm
2 , 20 psi).
PRESSURE RELIEF VALVE
The refrigerant system is also protected by a pressure relief valve, located in the rear head of the compressor.
When the pressure of refrigerant in the system in creases to an unusual level [more than 3.8 MPa (38 bar,
38.76 kg/cm
2 , 551 psi)], the release port on the pressure relief valve automatically opens and releases refrig-
erant into the atmosphere.
RJIA0849E
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MTC-24
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TROUBLE DIAGNOSIS
PASSENGER COMPARTMENT
1. Refrigerant pressure sensor E17 (if equipped) 2. A/C compressor F3 (if equipped)
WJIA2235E
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TROUBLE DIAGNOSISMTC-41
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1. Turn ignition switch OFF.
2. Disconnect front air control and BCM connector.
3. Check continuity between front air control harness connector
M33 (A) terminal 1and BCM harness connector M18 (B) termi-
nal 27.
OK or NG
OK >> GO TO 8.
NG >> Repair harness or connector.
8.CHECK REFRIGERANT PRESSURE SENSOR
1. Reconnect front air control connector and BCM connector.
2. Check refrigerant pressure sensor. Refer to EC-1030, "
Diagnosis Procedure" (MR18DE) or EC-451,
"Diagnosis Procedure" (HR16DE).
.OK or NG
OK >> • WITH CONSULT-III GO TO 9.
• WITHOUT CONSULT-III GO TO 10.
NG >> Replace as necessary.
9.CHECK BCM INPUT (FAN ON) SIGNAL
Check FAN ON/OFF signal. Refer to MTC-22, "
CONSULT-III Function (BCM)".
OK or NG
OK >> GO TO 12.
NG >> GO TO 10.
10.CHECK BCM INPUT (FAN ON) SIGNAL
1. Turn ignition switch ON.
2. Turn blower control dial to "1" position.
3. Confirm fan on signal between front air control harness connec- tor M33 terminal 14 and ground using oscilloscope.
OK or NG
OK >> GO TO 12.
NG >> GO TO 11.
11 .CHECK CIRCUIT CONTINUITY BETWEE N BCM AND FRONT AIR CONTROL
1 - 27
:Continuity should exist
SJIA0759E
FAN CONTROL DIAL ON : FAN ON SIG ON
FAN CONTROL DIAL OFF : FAN ON SIG OFF
Te r m i n a l s
Vo l ta g e
(Approx.)
(+)
(-)
Connector Terminal
Front air con- trol: M33 14 Ground
SJIA0750E
ZJIA0583J
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MTC-54
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TROUBLE DIAGNOSIS
YES >> GO TO 6.
NO >> Adjust or replace air mix door cable. Refer to MTC-65, "
Air Mix Door Cable Adjustment" .
6.CHECK AIR DUCTS
Check ducts for air leaks.
OK or NG
OK >> GO TO 7.
NG >> Repair air leaks.
7.CHECK HEATER HOSE TEMPERATURES
1. Start engine and warm it up to normal operating temperature.
2. Touch both the inlet and outlet heater hoses. The inlet hose should be hot and the outlet hose should be
warm.
Is the inlet hose hot and the outlet hose warm?
YES >> GO TO 8.
NO >> Both hoses warm: GO TO 9.
8.CHECK ENGINE COOLANT TEMPERATURE SENSOR
Check engine control temperature sensor. Refer to EC-690, "
Component Inspection" (MR18DE) or EC-163,
"Component Inspection" (HR16DE).
OK or NG
OK >> System OK.
NG >> Repair or replace as necessary. Retest.
9.CHECK HEATER HOSES
Check heater hoses for proper installation.
OK or NG
OK >> GO TO 10.
NG >> Repair /replace as necessary. Retest GO TO 7.
10.BACK FLUSH HEATER CORE
1. Back flush heater core.
2. Drain the water from the system.
3. Refill system with new engine coolant. Refer to CO-12, "
Changing Engine Coolant" (HR16DE) or CO-36,
"Changing Engine Coolant" (MR18DE) .
4. Start engine and warm it up to normal operating temperature.
5. Touch both the inlet and outlet heater hoses. The inlet hose should be hot and the outlet hose should be
warm.
Is the inlet hose hot and the outlet hose warm?
YES >> System OK.
NO >> Replace heater core and refill engine coolant. Refer to MTC-68, "
Removal and Installation" .
NoiseINFOID:0000000005396505
SYMPTOM: Noise
INSPECTION FLOW
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REFRIGERANT LINESMTC-77
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ComponentINFOID:0000000005396520
MR18DE - Type 1 and HR16DE
WJIA2200E
1. Evaporator 2. Expansion valve3. Low-pressure service valve
4. High-pressure service valve 5. Refrigerant pressure sensor 6. Shaft seal
7. Drain hose
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MTC-78
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REFRIGERANT LINES
MR18DE - Type 2
WJIA2202E
1. Evaporator2. Expansion valve 3. Low-pressure service valve
4. High-pressure service valve 5. Refrigerant pressure sensor 6. Shaft seal
7. Drain hose
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REFRIGERANT LINESMTC-89
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CAUTION:
• Replace O-rings of high-pressure flexible hose with a new ones, and apply compressor oil when
installing.
• When recharging refrigerant, check for leaks.
Removal and Installation of High-Pressure PipeINFOID:0000000005396525
REMOVAL
1. Remove low-pressure flexible hose. Refer to MTC-87, "Removal and Installation of Low-Pressure Flexible
Hose".
2. Remove high-pressure pipe from the clips.
3. Remove high-pressure pipe bolt (A), and then remove high- pressure pipe (1) from condenser (2).
CAUTION:
Cap or wrap the joint of the pi pe with suitable material such
as vinyl tape to avoid the entry of air.
INSTALLATION
Installation is in the reverse order of removal.
CAUTION:
• Replace O-rings of high-pressure pipe with a new ones, and apply compr essor oil when installing.
• When recharging refrigerant, check for leaks.
Removal and Installation of Refrigerant Pressure SensorINFOID:0000000005396526
REMOVAL
1. Use the recovery/recycling equipment to evacuate the refrigerant.
2. Disconnect connector, and then remove refrigerant pressure
sensor (1) from condenser (2).
CAUTION:
When working, be careful not to damage the condenser
fins.
INSTALLATION
1. High-pressure pipe A. High-pressure pipe clips
SJIA0679E
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MTC-90
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REFRIGERANT LINES
Installation is in the reverse order of removal.
CAUTION:
• Replace O-rings of refrigerant pressure sensor with a new one, and apply compressor oil when
installing.
• When recharging refrigerant, check for leaks.
Removal and Installation of CondenserINFOID:0000000005396527
REMOVAL
1. Remove the three upper headlamp bolts to reposition the headlamps out of the way.
2. Remove the radiator core support upper. Refer to BL-19, "
Removal and Installation".
3. Remove high-pressure flexible hose and high-pressure pipe from condenser. Refer to MTC-88, "
Removal
and Installation of High-Pressure Flexible Hose" and MTC-89, "Removal and Installation of High-Pressure
Pipe".
CAUTION:
Cap or wrap the joint of the pipe with suitable ma terial such as vinyl tape to avoid the entry of air.
4. Disconnect refrigerant pressure sensor connector.
5. Tilt radiator toward rear of vehicle, and then remove condenser (1) from between radiator and radiator core support upper.
CAUTION:
Be careful not to damage the core surface of condenser and
radiator.
NOTE:
MR18DE shown, HR16DE similar.
INSTALLATION
Installation is in the reverse order of removal.
CAUTION:
• Replace O-rings for A/C piping with new ones, and apply compressor oil when installing.
• When recharging refrigerant, check for leaks.
Removal and Installation of Liquid TankINFOID:0000000005396528
REMOVAL
1. Remove the condenser. Refer to MTC-90, "Removal and Installation of Condenser".
2. Clean liquid tank and its surrounding area, and remove dirt and rust from liquid tank. CAUTION:
Be sure to clean carefully.
3. Remove bolts (A) and (B) from liquid tank.
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