2004 INFINITI FX35 Engine

ATC-100
TROUBLE DIAGNOSIS
Revision: 2004 November 2004 FX35/FX45
Insufficient HeatingAJS00150
SYMPTOM: Insufficient heating
INSPECTION FLOW
*1ATC-61, "Operational Check".*2AT C - 7 3 , "Air Mix Door Motor Circuit".*3ATC-54, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 4 to
6.
*4ATC-54, "
FUNCTION CONFIRMA-
TION PROCEDURE", see No. 13.*5AT C - 6 6 , "
LAN System Circuit".*6ATC-79, "Blower Motor Circuit".
*7EC-185, "
DTC P0117, P0118 ECT
SENSOR" (VQ35DE) or EC-842,
"DTC P0117, P0118 ECT SEN-
SOR" (VK45DE).*8CO-11, "
Changing Engine Coolant"
(VQ35DE) or CO-36, "
Changing
Engine Coolant" (VK45DE).*9CO-15, "
Checking Radiator Cap"
(VQ35DE) or CO-41, "
Checking
Radiator Cap" (VK45DE).
RJIA2013E

ATC-104
TROUBLE DIAGNOSIS
Revision: 2004 November 2004 FX35/FX45
Ambient Sensor CircuitAJS00154
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 circuit 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 meter 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 for a few minutes after high speed driving. Although the actual ambient tem-
perature has not changed, the temperature detected by the 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.
DIAGNOSTIC PROCEDURE FOR AMBIENT SENSOR
SYMPTOM: Ambient sensor circuit is open or shorted. (21 or − 21 is
indicated on unified meter and A/C amp. As a result of performing
Self-diagnosis STEP-2.)
1. CHECK VOLTAGE BETWEEN AMBIENT SENSOR AND GROUND
1. Disconnect ambient sensor connector.
2. Turn ignition switch ON.
3. Check voltage between ambient sensor harness connector E34
terminal 1 (Y) and ground.
OK or NG
OK >> GO TO 2.
NG >> GO TO 4.
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1 – Ground : Approx. 5V
RJIA2017E

ATC-126
HEATER & COOLING UNIT ASSEMBLY
Revision: 2004 November 2004 FX35/FX45
HEATER & COOLING UNIT ASSEMBLYPFP:27110
Removal and InstallationAJS0015J
REMOVAL
1. Use a refrigerant collecting equipment (for HFC-134a) to discharge refrigerant.
2. Drain coolant from cooling system. Refer to CO-11, "
Changing Engine Coolant" (VQ35DE) or CO-36,
"Changing Engine Coolant" (VK45DE).
3. Remove cowl top cover. Refer to EI-24, "
COWL TOP" .
4. Remove high-pressure pipe 2 mounting clip.
5. Remove low-pressure flexible hose bracket mounting bolts.
6. Disconnect evaporator-side one touch joint.
a. Set a disconnector (High-pressure side: 92530-89908, Low-
pressure side: 92530-89916) 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:
Seal connection opening of piping with a cap or vinyl tape
to avoid exposure to atmosphere.
7. Remove electronic control throttle assembly (VQ35DE). Refer to
EM-19, "
INTAKE MANIFOLD COLLECTOR" .
8. Disconnect two heater hoses from heater core.
9. Remove instrument panel assembly. Refer to IP-11, "
Removal
and Installation" .
10. Remove blower unit. Refer to ATC-121, "
BLOWER UNIT" .
11. Remove instrument stays (driver side and passenger side).
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RJIA2041E
RJIA2077E
RJIA2042E

HEATER & COOLING UNIT ASSEMBLY
ATC-127
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: 2004 November 2004 FX35/FX45
12. Remove mounting bolts from heater & cooling unit.
13. Disconnect drain hose.
14. Remove ventilator ducts, defroster nozzle and ducts.
15. Remove steering member mounting bolts, nut and harness clips.
16. Remove the steering member, and then remove heater & cooling unit.
INSTALLATION
Installation is basically the reverse order of removal.
CAUTION:

Replace O-rings for A/C piping with new one, then apply compressor oil to it when installing it.

Connection point for female-side piping is thin. So, when inserting male-side piping, take care not
to deform female-side piping. Slowly insert in axial direction.

Insert one-touch joint connection point securely until it clicks.

After piping has been connected, pull male-side piping by hand to make sure piping does not
come off.

When recharging refrigerant, check for leaks.
NOTE:

When filling radiator with coolant, refer to CO-11, "Changing Engine Coolant" (VQ35DE) or CO-36,
"Changing Engine Coolant" (VK45DE).

Recharge the refrigerant.
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Heater & cooling unit mounting bolt
Tightening torque : 6.8 N·m (0.69 kg-m, 60 in - lb)
Steering member mounting nut and bolt
Tightening torque : 12 N·m (1.2 kg-m, 9 ft - lb)

REFRIGERANT LINES
ATC-141
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: 2004 November 2004 FX35/FX45
VQ35DE
1. Use a refrigerant collecting equipment (for HFC-134a) to discharge the refrigerant.
2. Remove the air cleaner and air duct. Refer to EM-17, "
AIR CLEANER AND AIR DUCT" (VQ35DE) or EM-
172, "AIR CLEANER AND AIR DUCT" (VK45DE).
3. Remove front engine undercover, using power tools.
4. Remove cooling fan shroud (lower). Refer to CO-39, "
RADIATOR" (VK45DE).
5. Remove mounting nuts from low-pressure flexible hose and
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.
6. Remove high-pressure flexible hose. Refer to ATC-148,
"Removal and Installation of High-pressure Flexible Hose"
(VK45DE).
7. Disconnect compressor (magnet clutch and ECV) connectors.
8. Remove the A/C compressor belt. Refer to EM-15, "
DRIVE BELTS" (VQ35DE) or EM-169, "DRIVE
BELTS" (VK45DE).
9. Remove mounting bolt from radiator hose bracket (VK45DE).
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REFRIGERANT LINES
ATC-149
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: 2004 November 2004 FX35/FX45
INSTALLATION
Installation is basically the reverse order of removal.
CAUTION:

Replace the O-ring of the high-pressure flexible hose with a new one, then apply compressor oil to
it when installing it.

Connection point for female-side piping is thin. So, when inserting male-side piping, take care not
to deform female-side piping. Slowly insert in axial direction.

Insert one-touch joint connection point securely until it clicks.

After piping has been connected, pull male-side piping by hand to make sure piping does not
come off.

When recharging refrigerant, check for leaks.
Removal and Installation of Low-pressure Pipe 1 (Engine Compartment)AJS0015V
REMOVAL
1. Use a refrigerant collecting equipment (for HFC-134a) to discharge the refrigerant.
2. Remove cowl top cover. Refer to EI-24, "
COWL TOP" .
3. Remove mounting bolt for low-pressure pipe 1 bracket and low-
pressure flexible hose bracket.
4. Disconnect one-touch joints.
a. Set a disconnector (92530-89916) 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 the pipe with suitable material such
as vinyl tape to avoid the entry of air.Bolt mounting the high-pressure flexible hose bracket
Tightening torque : 5.5 N·m (0.56 kg-m, 49 in-lb)
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ATC-150
REFRIGERANT LINES
Revision: 2004 November 2004 FX35/FX45
INSTALLATION
Installation is basically the reverse order of removal.
CAUTION:

Replace the O-ring of the low-pressure pipe 1 with a new one, then apply compressor oil to it when
installing it.

Connection point for female-side piping is thin. So, when inserting male-side piping, take care not
to deform female-side piping. Slowly insert in axial direction.

Insert one-touch joint connection point securely until it clicks.

After piping has been connected, pull male-side piping by hand to make sure piping does not
come off.

When recharging refrigerant, check for leaks.
Removal and Installation of High-pressure Pipe 1 and 2 (Engine Compartment)AJS001BH
REMOVAL
1. Use a refrigerant collecting equipment (for HFC-134a) to discharge the refrigerant.
2. Remove low-pressure pipe 1. Refer to ATC-149, "
Removal and Installation of Low-pressure Pipe 1
(Engine Compartment)" .
3. Remove high-pressure flexible hose and low-pressure flexible hose. Refer to ATC-148, "
Removal and
Installation of High-pressure Flexible Hose" and ATC-147, "Removal and Installation of Low-pressure
Flexible Hose" .
4. Remove high-pressure pipe 1 and 2 from clips.
5. Disconnect one-touch joint between condenser and high-pres-
sure pipe 1.
a. Set a disconnector (92530-89908) 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 the pipe with suitable material such
as vinyl tape to avoid the entry of air. Bolts mounting the low-pressure pipe 1 bracket and low-pressure flexible hose bracket
Tightening torque : 5.5 N·m (0.56 kg-m, 49 in-lb)
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RJIA2071E

ATC-154
REFRIGERANT LINES
Revision: 2004 November 2004 FX35/FX45
Removal and Installation of CondenserAJS0015Z
REMOVAL
1. Use a refrigerant collecting equipment (for HFC-134a) to discharge the refrigerant.
2. Remove the air cleaner and air duct. Refer to EM-17, "
AIR CLEANER AND AIR DUCT" (VQ35DE) or EM-
172, "AIR CLEANER AND AIR DUCT" (VK45DE).
3. Remove engine undercover, using power tools.
4. Drain engine coolant (VK45DE). Refer to CO-36, "
Changing Engine Coolant" .
5. Remove cooling fan shroud after removing radiator upper hose (VK45DE). Refer to CO-39, "
RADIATOR" .
6. Remove mounting bolt for high-pressure flexible hose bracket.
7. Disconnect high-pressure flexible hose and high-pressure pipe
1 from condenser.
a. Set a disconnector (Condenser outlet: 92530-89908, Condenser
inlet: 92530-89912) 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 the pipe with suitable material such
as vinyl tape to avoid the entry of air.
8. Remove mounting bolts for condenser.
9. Remove radiator upper mount, move radiator and condenser to the engine side.
10. Remove condenser.
CAUTION:
Be careful not to damage the core surface of the condenser and the radiator.
INSTALLATION
Installation is basically the reverse order of removal.
CAUTION:

Replace O-rings for A/C piping with new ones, then apply compressor oil to it when installing it.

Connection point for female-side piping is thin. So, when inserting male-side piping, take care not
to deform female-side piping. Slowly insert in axial direction.

Insert one-touch joint connection point securely until it clicks.
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