sensor NISSAN TIIDA 2007 Service Repair Manual

HA-8
< PRECAUTION >
PRECAUTIONS
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 same position as it is when mounted on the vehicle.
Doing so will cause oil to enter the low-pressure chamber.
 When connecting tubes, always use a torque wrench and a back-up wrench.
 After disconnecting tubes, immediately plug all openings to prevent entry of dirt and moisture.
 When installing an air conditioner 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 specified A/C oil to circle of the O-rings as shown. Be careful not to
apply oil to threaded portion.
 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 click, 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:0000000001396433
Plug all openings to prevent moisture and foreign matter from entering.
Connection type Piping connection point Part number QTY O-ring size
NewCondenser to high-pressure flexible hose 92472 N8210 1 12
Condenser to high-pressure pipe 92471 N8210 1 8
Low-pressure flexible hose to expansion valve 92473 N8210 1 16
High-pressure pipe to expansion valve 92471 N8210 1 8
Compressor to low-pressure flexible hose 92474 N8210 1 19
Compressor to high-pressure flexible hose 92472 N8210 1 12
Liquid tank to condenser pipeInlet
92471 N82101
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Outlet 1
FormerRefrigerant pressure sensor to condenser J2476 89956 1 10
Expansion valve to evaporatorInlet 92471 N8200 2 12
Outlet 92473 N8200 2 16
RHA861F

HA-16
< FUNCTION DIAGNOSIS >
REFRIGERATION SYSTEM
FUNCTION DIAGNOSIS
REFRIGERATION SYSTEM
Refrigerant CycleINFOID:0000000001396439
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. The 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 switched ON, the compressor runs continuously, and the
evaporator pressure, and temperature is controlled by the compressor to prevent freeze up.
Refrigerant System ProtectionINFOID:0000000001396440
REFRIGERANT PRESSURE SENSOR
The refrigerant system is protected against excessively high 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 the 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 increases 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.
1. Compressor 2. Pressure relief valve 3. Liquid tank
4. Refrigerant pressure sensor 5. Condenser 6. Expansion valve
AWIIA0054ZZ

HA-24
< ON-VEHICLE MAINTENANCE >
FLUORESCENT LEAK DETECTOR
FLUORESCENT LEAK DETECTOR
Checking System for Leaks Using the Fluorescent Leak DetectorINFOID:0000000001396445
1. Check A/C system for leaks using the UV lamp and safety goggles J-42220 in a low sunlight area (area
without windows preferable). Illuminate all components, fittings and lines. The dye will appear as a bright
green/yellow area at the point of leakage. Fluorescent dye observed at the evaporator drain opening indi-
cates an evaporator core assembly (tubes, core or expansion valve) leak.
2. If the suspected area is difficult to see, use an adjustable mirror or wipe the area with a clean shop rag or
cloth, with the UV lamp for dye residue.
3. After the leak is repaired, remove any residual dye using dye cleaner J-43872 to prevent future misdiag-
nosis.
4. Perform a system performance check and verify the leak repair with an approved electronic refrigerant
leak detector.
NOTE:
Other gases in the work area or substances on the A/C components, for example, anti-freeze, windshield
washer fluid, solvents and oils, may falsely trigger the leak detector. Make sure the surfaces to be checked are
clean.
Clean with a dry cloth or blow off with shop air.
Do not allow the sensor tip of the detector to contact with any substance. This can also cause false readings
and may damage the detector.
Dye InjectionINFOID:0000000001396446
(This procedure is only necessary when recharging the system or when the compressor has seized and was
replaced.)
1. Check A/C system static (at rest) pressure. Pressure must be at least 345 kPa (3.45 bar, 3.52 kg/cm
2, 50
psi).
2. Pour one bottle (1/4 ounce / 7.4 cc) of the A/C refrigerant dye into the injector tool J-41459.
3. Connect the injector tool to the A/C low-pressure side service fitting.
4. Start engine and switch A/C ON.
5. When the A/C operating (compressor running), inject one bottle (1/4 ounce / 7.4 cc) of fluorescent dye
through the low-pressure service valve using dye injector tool J-41459 (refer to the manufacture’s operat-
ing instructions).
6. With the engine still running, disconnect the injector tool from the service fitting.
CAUTION:
Be careful the A/C system or replacing a component, pour the dye directly into the open system
connection and proceed with the service procedures.
7. Operate the A/C system for a minimum of 20 minutes to mix the dye with the system oil. Depending on the
leak size, operating conditions and location of the leak, it may take from minutes to days for the dye to
penetrate a leak and become visible.

HA-26
< ON-VEHICLE MAINTENANCE >
ELECTRICAL LEAK DETECTOR
2. Connect a suitable A/C manifold gauge set to the A/C service ports.
3. Check if the A/C refrigerant pressure is at least 345 kPa (3.45 bar, 3.52 kg/cm
2, 50 psi) above 16°C. If less
than specification, recover/evacuate and recharge the system with the specified amount of refrigerant.
NOTE:
At temperatures below 16°C, leaks may not be detected since the system may not reach 345 kPa (3.45
bar, 3.52 kg/cm
2, 50 psi).
4. Perform the leak test from the high-pressure side (compressor discharge a to evaporator inlet f) to the
low-pressure side (evaporator drain hose g to shaft seal k). Refer to HA-27, "
Component". Perform a leak
check for the following areas carefully. Clean the component to be checked and move the leak detected
probe completely around the connection/component.
 Compressor
Check the fitting of high- and low-pressure flexible hoses, relief valve and shaft seal.
 Condenser
Check the fitting of high-pressure flexible hose and pipe, refrigerant pressure sensor.
 Liquid tank
Check the refrigerant connection.
 Service valves
Check all around the service valves. Ensure service valve caps are secured on the service valves (to
prevent leaks).
NOTE:
After removing A/C manifold gauge set from service valves, wipe any residue from valves to prevent any
false readings by leak detector.
 Cooling unit (Evaporator)
With engine OFF, turn blower fan on “High” for at least 15 seconds to dissipate any refrigerant trace in
the cooling unit. Wait a minimum of 10 minutes accumulation time (refer to the manufacturer’s recom-
mended procedure for actual wait time) before inserting the leak detector probe into the drain hose.
Keep the probe inserted for at least 10 seconds. Use caution not to contaminate the probe tip with water
or dirt that may be in the drain hose.
5. If a leak detector detects a leak, verify at least once by blowing compressed air into area of suspected
leak, then repeat check as outlined above.
6. Do not stop when one leak is found. Continue to check for additional leaks at all system components.
If no leaks are found, perform steps 7-10.
7. Start engine.
8. Set the heater A/C control as follows;
a. A/C switch: ON
b. Mode control dial position: VENT (Ventilation)
c. Intake door lever position: Recirculation
d. Max. cold temperature
e. Fan speed: High
9. Run engine at 1,500 rpm for at least 2 minutes.
10. Turn engine off and perform leak check again following steps 4
through 6 above.
Refrigerant leaks should be checked immediately after stopping
the engine. Begin with the leak detector at the compressor. The
pressure on the high-pressure side will gradually drop after
refrigerant circulation stops and pressure on the low-pressure
side will gradually rise, as shown in the graph. Some leaks are
more easily detected when pressure is high.
11. Before connecting recovery/recycling equipment to vehicle,
check recovery/recycling equipment gauges. No refrigerant
pressure should be displayed. If pressure is displayed, recover
refrigerant from equipment lines.
12. Discharge A/C system using approved refrigerant recovery/recycling equipment. Repair the leaking fitting
or component if necessary.
13. Evacuate and recharge A/C system and perform the leak test to confirm no refrigerant leaks.
14. Perform A/C performance test to ensure system works properly.
SHA839E

REFRIGERATION SYSTEM
HA-27
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ON-VEHICLE REPAIR
REFRIGERATION SYSTEM
ComponentINFOID:0000000001404235
MR18DE
AWIIA0442GB
1. Evaporator 2. Expansion valve 3. Low-pressure service valve
4. High-pressure service valve 5. Refrigerant pressure sensor 6. Shaft seal
7. Drain hose L. Refrigerant leak checking order M. Tightening torque
N. Wrench size P. O-ring size

HA-28
< ON-VEHICLE REPAIR >
REFRIGERATION SYSTEM
HR16DE
AWIIA0443GB
1. Evaporator 2. Expansion valve 3. Low-pressure service valve
4. High-pressure service valve 5. Refrigerant pressure sensor 6. Shaft seal
7. Drain hose L. Refrigerant leak checking order M. Tightening torque
N. Wrench size P. O-ring size

REFRIGERATION SYSTEM
HA-29
< ON-VEHICLE REPAIR >
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K9K
Refer to HA-4, "Precaution for Refrigerant Connection".
HFC-134a (R-134a) Service ProcedureINFOID:0000000001404234
SETTING OF SERVICE TOOLS AND EQUIPMENT
Discharging Refrigerant
ALIIA0091GB
1. Evaporator 2. Expansion valve 3. Low-pressure service valve
4. High-pressure service valve 5. Refrigerant pressure sensor 6. Shaft seal
7. Drain hose N. Refrigerant leak checking order P. Tightening torque
Q. Wrench size R. O-ring size

CONDENSER
HA-45
< ON-VEHICLE REPAIR >
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CONDENSER
Removal and Installation of Condenser - MR18DE, HR16DEINFOID:0000000001527646
REMOVAL
1. Use the recovery/recycling equipment to evacuate the refrigerant. Refer to HA-21, "HFC-134a (R-134a)
Service Procedure".
2. Remove the three upper headlamp bolts to reposition the headlamps out of the way
3. Remove the radiator core support upper.
4. Disconnect the high-pressure flexible hose and high-pressure pipe from condenser.
CAUTION:
Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air.
5. Disconnect refrigerant pressure sensor connector.
6. 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.
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. Refer to HA-22, "
Checking of Refrigerant Leaks".
Removal and Installation for Condenser - K9KINFOID:0000000001527627
REMOVAL
1. Use the recovery/recycling equipment to evacuate the refrigerant. Refer to HA-21, "HFC-134a (R-134a)
Service Procedure".
2. Remove the air duct (front).
3. Remove the radiator core support finisher.
4. Remove the front grille. Refer to EXT-19, "
Removal and Installation".
5. Remove the lower splash shield.
6. Remove the radiator core support upper.
7. Disconnect the high-pressure pipe from the condenser.
CAUTION:
Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of con-
taminants.
8. Disconnect the high-pressure flexible hose from the condenser.
CAUTION:
Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of con-
taminants.
9. Disconnect the refrigerant pressure sensor connector and remove the refrigerant pressure sensor.
10. Remove the four condenser bolts.
11. Remove the condenser.
CAUTION:
Do not damage the condenser fins
SJIA0682E

AMBIENT SENSOR
HA-47
< ON-VEHICLE REPAIR >
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AMBIENT SENSOR
Removal and Installation of Ambient Sensor - MR18DE, HR16DE and K9KINFOID:0000000001696506
NOTE:
Vehicles with automatic A/C systems and manual A/C system with a PTC heater are equipped with a ambient
sensor.
REMOVAL
1. Remove the front grille. Refer to EXT-19, "Removal and Installation".
2. Disconnect the ambient sensor connector (1), and then remove
the ambient sensor (2).
INSTALLATION
Installation is in the reverse order of removal.
ALIIA0209ZZ

HA-48
< ON-VEHICLE REPAIR >
REFRIGERANT PRESSURE SENSOR
REFRIGERANT PRESSURE SENSOR
Removal and Installation of Refrigerant Pressure Sensor - MR18DE, HR16DE
INFOID:0000000001527644
REMOVAL
1. Use the recovery/recycling equipment to evacuate the refrigerant. Refer to HA-21, "HFC-134a (R-134a)
Service Procedure".
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
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 charging the refrigerant, check for leaks. Refer to HA-22, "
Checking of Refrigerant Leaks".
Removal and Installation of Refrigerant Pressure Sensor - K9KINFOID:0000000001527628
REMOVAL
1. Use the recovery/recycling equipment to evacuate the refrigerant. Refer to HA-21, "HFC-134a (R-134a)
Service Procedure".
2. Remove the air duct (front).
3. Remove the radiator core support finisher.
4. Remove the front grille. Refer to EXT-19, "
Removal and Installation".
5. Reposition the LH air guide out of the way.
6. Disconnect the refrigerant pressure sensor connector and
remove the refrigerant pressure sensor (1) from the liquid tank
on the condenser.
CAUTION:
Do not damage the condenser fins.
INSTALLATION
Installation is in the reverse order of removal.
CAUTION:
 Replace the O-ring of the refrigerant pressure sensor with a new one, and apply compressor oil
when installing.
 When charging the refrigerant, check for leaks. Refer to HA-22, "
Checking of Refrigerant Leaks".
SJIA0681E
ALIIA0004ZZ