2006 INFINITI M35 low oil pressure

REFRIGERATION SYSTEM
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Revision: 2006 January2006 M35/M45
Operation
1. Control Valve
–By changing high-pressure valve lift amount, built-in electronic control valve executes the following:
• Controls high-pressure valve discharge amount.
• Changes crankcase pressure in compressor.
• Changes angle of swash plate.
–Amount of high-pressure valve lift is determined by factors below.
• Low-pressure applied to diaphragm
• Spring load of set spring
• Balance of magnetic force generated in magnet coil
–Electronic control valve (ECV) magnet coil receives electric signal (duty control) from unified meter and A/
C amp. Then, magnetic force generated by electric current is changed to control high-pressure valve lift
amount.
2. Maximum Cooling
High-pressure valve is closed by magnetic force generated by electric signal sent from unified meter and
A/C amp. At this time, cylinder moves full stroke due to pressure balance between inside crankcase (Pc)
and suction line (Ps).
Under this condition, the swash plate is set to the maximum stroke position.
3. Capacity Control
When no electric signal is sent from unified meter and A/C amp. (current: OFF), high-pressure valve is
opened by spring force.
Since suction pressure is low, it makes the suction port close and the discharge port open. Thus, crank-
case pressure becomes high as high-pressure enters the crankcase.
–The force acts around the link near the swash plate, and is generated by the pressure difference before
and behind the piston.
–The thrust flange and link are located where the piston generates the highest pressure. Piston pressure is
between suction pressure Ps and discharge pressure Pd, which is close to suction pressure Ps. If crank-
case pressure Pc rises due to capacity control, the force around the link makes the swash plate angle
decrease and also the piston stroke decrease. In other words, crankcase pressure increase triggers pres-
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INTAKE SENSOR
ATC-129
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Revision: 2006 January2006 M35/M45
INTAKE SENSORPFP:27723
Removal and InstallationNJS000H9
REMOVAL
1. Remove low-pressure pipe 1 and high-pressure pipe 2. Refer to ATC-162, "Removal and Installation of
Low-Pressure Pipe 1 and High-Pressure Pipe 2" .
CAUTION:
Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air.
2. Slide evaporator to passenger side, and then remove intake
sensor.
INSTALLATION
Installation is basically the reverse order of removal.
CAUTION:
Replace O-rings of A/C piping with new ones, and then apply compressor oil to it when installing
it.
Mark the mounting position of intake sensor bracket prior to removal so that the reinstalled sen-
sor can be located in the same position.
Female-side piping connection is thin and easy to deform. Slowly insert the male-side piping
straight in axial direction.
Insert piping securely until a click is heard.
After piping connection is completed, pull male-side piping by hand to make sure that connection
does not come loose.
When recharging refrigerant, check for leaks.
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REFRIGERANT LINES
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Revision: 2006 January2006 M35/M45
7. Disconnect compressor (magnet clutch and ECV) connectors.
8. Remove mounting bolts from compressor, using power tools.
9. Remove compressor downward of the vehicle.
INSTALLATION
Installation is basically the reverse order of removal.
CAUTION:
Replace O-rings of low-pressure flexible hose, low-pressure pipe 1 (VK45DE) and high-pressure
flexible hose with new ones, and then apply compressor oil to it when installing it.
When recharging refrigerant, check for leaks.
Check Disc to Pulley ClearanceNJS000I7
Check clearance around entire periphery of clutch disc.
If specified clearance is not obtained, replace compressor.
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Disc to pulley
clearance: 0.3 - 0.6 mm (0.012 - 0.024 in)
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REFRIGERANT LINES
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Revision: 2006 January2006 M35/M45
CAUTION:
Replace O-rings of low-pressure flexible hose and low-pressure pipe (VK45DE) with new ones,
and then apply compressor oil to it when installing it.
Female-side piping connection is thin and easy to deform. Slowly insert the male-side piping
straight in axial direction.
Insert piping securely until a click is heard.
After piping connection is completed, pull male-side piping by hand to make sure that connection
does not come loose.
When recharging refrigerant, check for leaks.
Removal and Installation of High-Pressure Flexible HoseNJS000HQ
REMOVAL
1. Use a refrigerant collecting equipment (for HFC-134a) to discharge the refrigerant.
2. Remove engine cover. Refer to EM-14, "
ENGINE ROOM COVER" (VQ35DE) or EM-173, "ENGINE
ROOM COVER" (VK45DE).
3. Remove air cleaner case and air duct. Refer to EM-17, "
AIR CLEANER AND AIR DUCT" (VQ35DE) or
EM-177, "
AIR CLEANER AND AIR DUCT" (VK45DE).
4. Remove mounting bolt from high-pressure flexible hose bracket.
5. Disconnect one-touch joint between high-pressure flexible hose
and condenser.
a. Set a disconnector (SST: 9253089912) on A/C piping.
b. Slide a disconnector backward until it clicks.
c. Slide A/C piping backward and disconnect it.
CAUTION:
Cap or wrap the joint of the pipe with suitable material such
as vinyl tape to avoid the entry of air.
6. Remove low-pressure pipe (VK45DE). Refer to ATC-158, "
Removal and Installation of Low-Pressure
Flexible Hose and Pipe" .
7. Remove mounting nut from high-pressure flexible hose, and
then remove high-pressure flexible hose.
CAUTION:
Cap or wrap the joint of the pipe with suitable material such
as vinyl tape to avoid the entry of air.Low-pressure flexible hose bracket mounting bolt
: 4.2 Nꞏm (0.43 kg-m, 37 in-lb)
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ATC-160
REFRIGERANT LINES
Revision: 2006 January2006 M35/M45
INSTALLATION
Installation is basically the reverse order of removal.
CAUTION:
Replace O-rings of high-pressure flexible house with new ones, and then apply compressor oil to
it when installing it.
Female-side piping connection is thin and easy to deform. Slowly insert the male-side piping
straight in axial direction.
Insert piping securely until a click is heard.
After piping connection is completed, pull male-side piping by hand to make sure that connection
does not come loose.
When recharging refrigerant, check for leaks.
Removal and Installation of High-Pressure Pipe 1 (Engine Compartment)NJS000HR
REMOVAL
1. Remove low-pressure flexible hose. Refer to ATC-158, "Removal and Installation of Low-Pressure Flexi-
ble Hose and Pipe" .
2. Remove mounting bolt from high-pressure flexible hose bracket.
3. Remove high-pressure pipe 1 from vehicle clips.
4. Disconnect one-touch joints of high-pressure pipe 1.
a. Set a disconnector (SST: 9253089908) on A/C piping.
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High-pressure flexible hose bracket mounting bolt
: 4.2 Nꞏm (0.43 kg-m, 37 in-lb)
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REFRIGERANT LINES
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Revision: 2006 January2006 M35/M45
b. Slide a disconnector toward (or upward) vehicle front until it clicks.
c. Slide A/C piping toward (or upward) vehicle front and disconnect it.
CAUTION:
Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air.
5. Remove high-pressure pipe 1.
INSTALLATION
Installation is basically the reverse order of removal.
CAUTION:
Replace O-rings of high-pressure pipe 1 with new ones, and then apply compressor oil to it when
installing it.
Female-side piping connection is thin and easy to deform. Slowly insert the male-side piping
straight in axial direction.
Insert piping securely until a click is heard.
After piping connection is completed, pull male-side piping by hand to make sure that connection
does not come loose.
When recharging refrigerant, check for leaks.
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High-pressure flexible hose bracket mounting bolt
: 4.2 Nꞏm (0.43 kg-m, 37 in-lb)

REFRIGERANT LINES
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Revision: 2006 January2006 M35/M45
13. Remove mounting bolt, and then remove low-pressure pipe 1
and high-pressure pipe 2.
CAUTION:
Cap or wrap the joint of the pipe with suitable material such
as vinyl tape to avoid the entry of air.
INSTALLATION
Installation is basically the reverse order of removal.
CAUTION:
Replace O-rings of A/C piping with new ones, and then apply compressor oil to it when installing
it.
Female-side piping connection is thin and easy to deform. Slowly insert the male-side piping
straight in axial direction.
Insert piping securely until a click is heard.
After piping connection is completed, pull male-side piping by hand to make sure that connection
does not come loose.
When recharging refrigerant, check for leaks.
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Low-pressure flexible hose bracket mounting bolt
: 4.2 Nꞏm (0.43 kg-m, 37 in-lb)

REFRIGERANT LINES
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Revision: 2006 January2006 M35/M45
INSTALLATION
Install liquid tank, and then install liquid tank bracket on condenser.
CAUTION:
Make sure liquid tank bracket is securely installed at protru-
sion of condenser. (Make sure liquid tank bracket does not
move to a position below center of liquid tank.)
Replace O-rings of A/C piping with new ones, and then
apply compressor oil to it when installing it.
When recharging refrigerant, check for leaks.
Removal and Installation of CondenserNJS000HU
REMOVAL
1. Use a refrigerant collecting equipment (for HFC-134a) to discharge the refrigerant.
2. Remove engine cover. Refer to EM-14, "
ENGINE ROOM COVER" (VQ35DE) or EM-173, "ENGINE
ROOM COVER" (VK45DE).
3. Remove air cleaner case, air hose and air duct. Refer to EM-17, "
AIR CLEANER AND AIR DUCT"
(VQ35DE) or EM-177, "AIR CLEANER AND AIR DUCT" (VK45DE).
4. Remove engine under cover, using power tools.
5. Drain engine coolant. Refer to CO-11, "
Changing Engine Coolant" (VQ35DE) or CO-40, "Changing
Engine Coolant" (VK45DE).
6. Remove radiator fan shroud with cooling fan after (VK45DE). Refer to CO-51, "
COOLING FAN" .
7. Remove mounting clips and bolts, and then remove bracket.
8. Remove radiator upper mount, remove radiator and condenser
to the engine side.
9. Remove mounting bolt from high-pressure flexible hose bracket.
10. Remove high-pressure pipe1 from vehicle clip.
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