2008 INFINITI FX35 engine

ATC-86
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
Ambient Sensor Circuit
INFOID:0000000001328196
COMPONENT DESCRIPTION
Ambient Sensor
The ambient sensor is attached on the hood lock stay. It detects
ambient temperature and converts it into a resistance value which is
then input into the unified meter and A/C amp.
AMBIENT TEMPERATURE INPUT PROCESS
The unified meter and A/C amp. includes a processing circ uit for the ambient sensor input. However, when the
temperature detected by the ambient sensor increases quickly, the processing circuit retards the unified meter
and A/C amp. function. It only allows the unified mete r and A/C amp. to recognize an ambient temperature
increase of 0.33 °C (0.6 °F) per 100 seconds.
As an example, consider stopping fo r a few minutes after high speed driving. Although the actual ambient tem-
perature has not changed, the temperature detected by t he ambient sensor will increase. This is because the
heat from the engine compartment can radiate to the front grille area, location of the ambient sensor.
DIAGNOSIS PROCEDURE FOR AMBIENT SENSOR
*1AT C - 5 2 , "Power Supply and Ground
Circuit for Auto Amp"
*2AT C - 5 0 , "Operational Check"*3AT C - 4 3 , "Self-Diagnosis Function"
SJIA1595E
RJIA2016E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

ATC-108
< SERVICE INFORMATION >
HEATER & COOLING UNIT ASSEMBLY
HEATER & COOLING UNIT ASSEMBLY
Removal and InstallationINFOID:0000000001328211
REMOVAL
1. Use a refrigerant collecting equipment (for HFC-134a) to discharge the refrigerant.
2. Drain coolant from cooling system. Refer to CO-10, "
Changing Engine Coolant" (VQ35DE) or CO-37,
"Changing Engine Coolant" (VK45DE).
3. Remove cowl top cover. Refer to EI-23
.
4. Remove high-pressure pipe 2 mounting clip.
5. Remove low-pressure flexible hose bracket mounting bolt. Refer to ATC-128, "
Removal and Installation of
Low-Pressure Flexible Hose".
6. Disconnect low-pressure pipe 1 and high-pressure pipe 2 from evaporator.
a. Set a disconnector [high-pressure side (SST: 9253089908), low- pressure side (SST: 9253089916)] on A/C piping.
b. Slide a disconnector toward vehicle front until it clicks.
c. Slide A/C piping toward vehicle front and disconnect it. CAUTION:
Cap or wrap the joint of low- pressure pipe 1, 2 and high-
pressure pipe 2, 3 with suitab le material such as vinyl tape
to avoid the entry of air.
7. Remove electric throttle control actuator (VQ35DE). Refer to EM-19
.
8. Disconnect two heater hoses from heater core.
9. Remove instrument panel and pad. Refer to IP-10
.
10. Remove blower unit. Refer to ATC-103
.
RJIA2037E
RJIA2077E
RJIA2041E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

ATC-110
< SERVICE INFORMATION >
HEATER & COOLING UNIT ASSEMBLY
NOTE:
 When filling radiator with coolant, refer to CO-10, "
Changing Engine Coolant" (VQ35DE) or CO-37, "Chang-
ing Engine Coolant" (VK45DE).
 Recharge the refrigerant.
Heater & cooling unit assembly mounting bolt: 6.8 N·m (0.69 kg-m, 60 in-lb)
Steering member mounting nut and bolt : 12 N·m (1.2 kg-m, 9 fl-lb)
Steering column mounting nut and bolt : 16.7 N·m (1.7 kg-m, 12 fl-lb)
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

ATC-124
< SERVICE INFORMATION >
REFRIGERANT LINES
VK45DE
1. Use a refrigerant collecting equipment (for HFC-134a) to discharge the refrigerant.
2. Remove air cleaner case and air duct. Refer to EM-17
(VQ35DE) or EM-173 (VK45DE).
3. Remove front engine undercover, using power tools.
4. Remove cooling fan shroud (lower). Refer to CO-40
(VK45DE).
5. Remove mounting nuts from low-pressure flexible hose and high-pressure flexible hose.
CAUTION:
Cap or wrap the joint of co mpressor, low-pressure flexible
hose and high-pressure flexibl e hose with suitable material
such as vinyl tape to avoid the entry of air.
6. Remove high-pressure flexible hose. Refer to ATC-129,
"Removal and Installation of High-pressure Flexible Hose"
(VK45DE).
7. Disconnect compressor connector.
8. Remove A/C compressor belt. Refer to EM-15, "
Removal and Installation" (VQ35DE) or EM-170,
"Removal and Installation" (VK45DE).
RJIA2244E
RJIA2059E
RJIA2058E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

REFRIGERANT LINESATC-131
< SERVICE INFORMATION >
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Removal and Installation of Low-Pre ssure Pipe 1 (Engine Compartment)INFOID:0000000001328223
REMOVAL
1. Use a refrigerant collecting equipment (f or HFC-134a) to discharge the refrigerant.
2. Remove cowl top cover. Refer to EI-23
.
3. Remove low-pressure pipe 1 bracket and low-pressure flexible hose bracket mounting bolts.
4. Disconnect one-touch joints.
a. Set a disconnector (SST: 9253089916) on A/C piping.
b. Slide a disconnector toward vehicle front until it clicks.
c. Slide A/C piping toward vehicle front and disconnect it.
5. Remove low-pressure pipe 1. CAUTION:
Cap or wrap the joint of low-pressure pipe 1 and 2 with suit-
able material such as vinyl ta pe to avoid the entry of air.
INSTALLATION
Installation is basically the reverse order of removal.
CAUTION:
 Replace O-rings of low-pressure pipe 1 with new ones, and th en apply compressor oil to it when
installing it.
 Female-side piping c onnection 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 comple ted, pull male-side piping by hand to make sure that connection
does not come loose.
 When recharging refrigerant, check for leaks. High-pressure flexible hose bracket mounting bolt
: 5.5 N·m (0.56 kg-m, 49 in-lb)
RJIA2068E
RJIA2069E
RJIA2037E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

ATC-132
< SERVICE INFORMATION >
REFRIGERANT LINES
Removal and Installation of High-pressu re Pipe 1 and 2 (Engine Compartment)
INFOID:0000000001328224
REMOVAL
1. Remove low-pressure pipe 1. Refer to ATC-131, "Removal and Installation of Low-Pressure Pipe 1
(Engine Compartment)".
2. Remove high-pressure flexible hose and low-pressure flexible hose. Refer to ATC-129, "
Removal and
Installation of High-pressure Flexible Hose" and ATC-128, "Removal and Installation of Low-Pressure
Flexible Hose".
3. Remove high-pressure pipe 1 and 2 from clips.
4. Disconnect one-touch joint between condenser and high-pres- sure pipe 1.
a. Set a disconnector (SST: 9253089908) on A/C piping.
b. Slide a disconnector upward until it clicks.
c. Slide A/C piping upward and disconnect it. CAUTION:
Cap or wrap the joint of condenser and high-pressure pipe
1 with suitable material such as vinyl tape to avoid the entry
of air.
5. Disconnect one-touch joint between high-pressure pipe 1 and 2.
a. Set a disconnector (SST: 9253089908) on A/C piping.
b. Slide a disconnector toward vehicle rear until it clicks.
c. Slide A/C piping toward vehicle rear and disconnect it. CAUTION:
Cap or wrap the joint of hi gh-pressure pipe 1 and 2 with
suitable material such as vinyl tape to avoid the entry of air.
6. Remove high-pressure pipe 1. Low-pressure pipe 1 bracket and low-pressu
re flexible hose bracket mounting bolts
: 5.5 N·m (0.56 kg-m, 49 in-lb)
RJIA2070E
RJIA2071E
RJIA2072E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

ATC-136
< SERVICE INFORMATION >
REFRIGERANT LINES
5. Remove washer tank mounting bolt.
6. Remove high-pressure flexible hose bracket mounting bolt.
7. Disconnect high-pressure flexible hose and high-pressure pipe1 from condenser.
a. Set a disconnector [condenser outlet (SST: 9253089908), con- denser inlet (SST: 9253089912)] on A/C piping.
b. Slide a disconnector upward until it clicks.
c. Slide A/C piping upward and disconnect it. CAUTION:
Cap or wrap the joint of co ndenser, high-pressure flexible
hose and high-pressure pipe 1 with suitable material such
as vinyl tape to avoid the entry of air.
8. Remove condenser mounting bolts.
9. Remove radiator upper mount, move radiator and condenser to the engine side.
10. Remove condenser. CAUTION:
Be careful not to damage the core su rface of the condenser and the radiator.
INSTALLATION
Installation is basically the reverse order of removal.
CAUTION:
 Replace O-rings of high-pressure flexible hose and 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.
PBIC1534E
RJIA2065E
RJIA2066E
SJIA1570E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

REFRIGERANT LINESATC-139
< SERVICE INFORMATION >
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4. Perform a system performance check and verify the l eak repair with an approved electrical 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 lubricants, 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:0000000001328233
(This procedure is only necessary when recharging t he 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 (3.52 kg/cm
2, 50 psi).
2. Pour one bottle (1/4 ounce / 7.4 cc) of the A/C refr igerant dye into the injector tool (SST: J-41459).
3. Connect the injector tool to the A/C low-pressure side service valve.
4. Start the 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 inje ctor tool (SST: J-41459) (refer to the manufacture’s
operating instructions).
6. With the engine still running, disconnect the injector tool from the service valve. CAUTION:
Be careful the A/C system or replacing a componen t, pour the dye directly into the open system
connection and proceed wi th 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.
8. Attach a blue label as necessary.
Electrical Leak DetectorINFOID:0000000001328234
PRECAUTIONS FOR HANDLING LEAK DETECTOR
When performing a refrigerant leak check, use an A/C electrical leak
detector (SST) or equivalent. Ensure that the instrument is calibrated
and set properly per the operating instructions.
The leak detector is a delicate device. In order to use the leak detec-
tor properly, read the operating instructions and perform any speci-
fied maintenance.
1. Position probe approximately 5 mm (3/16 in) away from point to
be checked.
SHA196FA
SHA707EA
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C