2008 INFINITI FX35 check engine

PRECAUTIONSATC-9
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CAUTION:
When replacing or cleaning refrigerant cycle components, observe the following.
 When the compressor is removed, store it in the sam e way at it is when mounted on the car. Failure
to do so will cause lubricant to enter 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 dust and moisture.
 When installing an air conditioner in the vehicle, connect the pipes at the final stage of the operation.
Never remove the seal caps of pipes and other compon ents until just before required for connection.
 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 refriger ation system before charging the refrigerant.
 Always replace used O-rings.
 When connecting tubes, apply lubricant to circle of the O-rings shown in illustration. Be careful not
to apply lubricant to threaded portion.
 O-ring must be closely att ached to the groove of tube.
 When replacing the O-ring, be careful not to damage O-ring and tube.
 Connect tube until a click can be heard, then tighten the nut or bolt by hand. 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:0000000001328156
 Plug all openings to prevent moisture and foreign matter from entering.
 When the compressor is removed, store it in th e same way at it is when mounted on the car.
 When replacing or repairing compressor, follow “Maintenance of Lubricant Quantity in Compressor”
exactly. Refer to ATC-22, "
Maintenance of Lubricant Quantity in Compressor".
 Keep friction surfaces between clut ch and pulley clean. If the surface is contaminated with lubricant,
wipe it off by using a clean w aste cloth moistened with thinner.
 After compressor service operation, turn the compr essor shaft by hand more than five turns in both
directions. This will equally dist ribute lubricant inside the compressor. After the compressor is
installed, let the engine idle and operate the compressor for one hour.
 After replacing the compressor magnet clutch, ap ply voltage to the new one and check for normal
operation.
Precaution for Service EquipmentINFOID:0000000001328157
RECOVERY/RECYCLING EQUIPMENT
Name : Nissan A/C System Oil Type S
RHA861F
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ATC-22
< SERVICE INFORMATION >
LUBRICANT
LUBRICANT
Maintenance of Lubricant Quantity in CompressorINFOID:0000000001328166
The lubricant in the compressor circulates through the system with the refrigerant. Add lubricant to compres-
sor when replacing any component or after a large refriger ant leakage occurred. It is important to maintain the
specified amount.
If lubricant quantity is not maintained properly, the following malfunctions may result:
 Lack of lubricant: May lead to a seized compressor.
 Excessive lubricant: Inadequate cooling (thermal exchange interference)
LUBRICANT
LUBRICANT RETURN OPERATION
Adjust the lubricant quantity according to the test group shown below.
1.CHECK LUBRICANT RETURN OPERATION
Can lubricant return operation be performed?
 A/C system works properly.
 There is no evidence of a lar ge amount of lubricant leakage.
CAUTION:
If excessive lubricant leakage is noted, never perform the lubricant return operation.
OK or NG
OK >> GO TO 2.
NG >> GO TO 3.
2.PERFORM LUBRICANT RETURN OPERATION, PROCEEDING AS FOLLOWS
1. Start the engine, and set to the following conditions:
- Engine speed: Idling to 1,200 rpm
- A/C switch: ON
- Blower speed: Max. position
- Temp. control: Optional [Set so that intake air temperature is 25 to 30 °C (77 to 86 °F).]
- Intake position: Recirculation (REC)
2. Perform lubricant return operation for about 10 minutes.
3. Stop the engine.
>> GO TO 3.
3.CHECK REPLACEMENT PART
Should the compressor be replaced?
YES >> Go to "LUBRICANT ADJUSTING PROCEDURE FOR COMPRESSOR REPLACEMENT".
NO >> Go to "LUBRICANT ADJUSTING PROCEDURE FOR COMPONENTS REPLACEMENT EXCEPT COMPRESSOR".
LUBRICANT ADJUSTING PROCEDURE FOR COMPONENTS REPLACEMENT EXCEPT COM-
PRESSOR
After replacing any of the followi ng major components, add the correct am ount of lubricant to the system.
Amount of lubricant to be added: Name : NISSAN A/C System Oil Type S
Part replaced
Lubricant to be added to system
Remarks
Amount of lubricant
m (US fl oz., Imp fl oz.)
Evaporator 75 (2.5, 2.6) —
Condenser 35 (1.2, 1.2) —
Liquid tank 10 (0.3, 0.4) —
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ATC-44
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
Shifting from STEP-5 to AUXILIARY MECHANISM is accomplished by means of pressing (fan) UP switch.
FUNCTION CONFIRMATION PROCEDURE
1.SET IN SELF-DIAGNOSIS MODE
1. Turn ignition switch ON.
2. Set in self-diagnosis mode as follows. Within 10 seconds after starting engine (ignition switch is turned ON.), press OFF switch for at least 5 seconds.
NOTE:
 If battery voltage drops below 12 V during diagnosis STEP-3, door motor speed becomes slower and as a
result, the system may generate an error even when operation is normal. To avoid this, start engine before
performing this diagnosis.
 Former STEP-1 (LEDs and display screen are checked) does not exist in this self-diagnosis function.
>> GO TO 2.
2.STEP-2: SENSOR CIRCUITS ARE CHECK ED FOR OPEN OR SHORT CIRCUIT
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ATC-50
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
4. Press the mode switch as desired.
When battery cable is disconnected or battery voltage is below 10 V, trimmer operation is canceled. Wind dis-
tribution ratio set becomes that of initial condition.
AUXILIARY MECHANISM: INLET PORT MEMORY FUNCTION
When ignition switch is turned from OFF to ON, inlet port memory function at manual mode can be set.
Operating procedures for this trimmer are as follows:1. Begin self-diagnosis STEP-5 mode. Refer to "Self-diagnosis Function".
2. Press (fan) UP switch to set system in auxiliary mode.
3. Press the intake switch as desired.
When battery cable is disconnected or battery voltage is below 10 V, memory function is canceled. Memory
function set becomes that of initial condition.
Operational CheckINFOID:0000000001328182
The purpose of the operational check is to c heck if the individual system operates properly.
CHECKING MEMORY FUNCTION
1. Press the temperature control (UP) switch (driver side) until 32°C (90 °F) is displayed.
2. Press OFF switch.
3. Turn ignition switch OFF.
4. Turn ignition switch ON.
5. Press the AUTO switch.
6. Confirm that the set temperature remains at previous temperature.
7. Press OFF switch.
If NG, go to trouble diagnosis procedure for ATC-85, "
Memory Function".
If OK, continue the check.
CHECKING BLOWER
SJIA1581E
LED status of
FRE position LED status of
REC position Setting status
Setting changeover
method
FRE REC
OFF OFF AUTO control AUTO control
Intake SW: ON
OFF ON AUTO control (Initial setting)
Manual REC status is memorized.
(Initial setting)
ON OFF Manual FRE status is memorized. AUTO control
ON ON Manual FRE status is memorized. Manual REC status is memorized.
Conditions : Engine running at normal operating temperature
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ATC-72
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
3. Check continuity between BCM harness connector M3 terminal27 and unified meter and A/C amp. harness connector M57 ter-
minal 42.
OK or NG
OK >> GO TO 7.
NG >> Repair harness or connector.
7.CHECK VOLTAGE FOR UNIFIED METER AND A/C AMP. (COMPRESSOR ON SIGNAL)
1. Reconnect BCM connector and unified meter and A/C amp. connector.
2. Turn ignition switch ON.
3. Check voltage between unified meter and A/C amp. harness connector M57 terminal 42 and ground using an oscilloscope.
OK or NG
OK >> GO TO 8.
NG-1 >> If the voltage is approx. 5 V when A/C switch is ON: Replace unified meter and A/C amp.
NG-2 >> If the voltage is approx. 0 V w hen A/C switch is OFF: Replace BCM.
8.CHECK REFRIGERANT PRESSURE SENSOR
WITH CONSULT-III
1. Start the engine.
2. Check voltage of refrigerant pressure sensor in “Data monitor”. Refer to EC-127, "
CONSULT-III Reference
Value in Data Monitor Mode" (VQ35DE) or EC-705, "CONSULT-III Reference Value in Data Monitor
Mode" (VK45DE).
WITHOUT CONSULT-III
1. Start the engine. 27 – 42 : Continuity should exist.
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Te r m i n a l s
Condition Voltage
(+)
(− )
Unified meter
and A/C amp.
connector Te r m i n a l
No.
M57 42 Ground A/C switch: ON
(Blower motor operates.)
Approx. 0 V
OFF switch: ON
(A/C system: OFF)
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TROUBLE DIAGNOSISATC-79
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High-pressure Side is Too High and Low-pressure Side is Too Low
High-pressure Side is Too Low and Low-pressure Side is Too High
Both High- and Low-pressure Sides are Too Low
Gauge indication Refrigerant cycle Probable cause Corrective action
Both high- and low-pressure sides
are too high. The pressure returns to nor-
mal soon after water is
splashed on condenser.
Excessive refrigerant charge in
refrigeration cycle.
Reduce refrigerant until speci-
fied pressure is obtained.
Air suction by cooling fan is in-
sufficient. Insufficient condenser cooling
performance.
↓
1. Condenser fins are
clogged.
2. Improper fan rotation of cooling fan.  Clean condenser.
 Check and repair cooling fan
as necessary.
 Low-pressure pipe is not cold.
 When compressor is stopped high-pressure val-
ue quickly drops by approx-
imately 196 kPa (2 kg/cm
2,
28 psi). It then decreases
gradually thereafter. Poor heat exchange in con-
denser
(After compressor operation
stops, high-pressure decreas-
es too slowly.).
↓
Air in refrigeration cycle.
Evacuate repeatedly and re-
charge system.
Engine tends to overheat. Engine cooling systems mal-
function. Check and repair each engine
cooling system.
 An area of the low-pressure pipe is colder than areas
near the evaporator outlet.
 Low-pressure pipe is some- times covered with frost.  Excessive liquid refrigerant
on low-pressure side.
 Excessive refrigerant dis- charge flow.
 Expansion valve is open a lit- tle compared with the speci-
fication.
↓
Improper expansion valve ad-
justment. Replace expansion valve.
AC359A
Gauge indication Refrigerant cycle Probable cause Corrective action
High-pressure side is too high and
low-pressure side is too low.
Upper side of condenser and
high-pressure side are hot,
however, liquid tank is not so
hot.High-pressure tube or parts lo-
cated between compressor
and condenser are clogged or
crushed. Check and repair or replace
malfunctioning parts.
 Check lubricant for contami- nation.
AC360A
Gauge indication Refrigerant cycle Probable cause Corrective action
High-pressure side is too low and
low-pressure side is too high. High- and low-pressure sides
become equal soon after com-
pressor operation stops.Compressor pressure opera-
tion is improper.
↓
Damaged inside compressor
packings.
Replace compressor.
No temperature difference be-
tween high- and low-pressure
sides. Compressor pressure opera-
tion is improper.
↓
Damaged inside compressor
packings.
Replace compressor.
AC356A
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TROUBLE DIAGNOSISATC-83
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NoiseINFOID:0000000001328193
SYMPTOM: Noise
INSPECTION FLOW
*1 AT C - 5 0 , "Operational Check"*2AT C - 5 9 , "Air Mix Door Motor Circuit"*3AT C - 4 3 , "Self-Diagnosis Function",
see No. 4 to 6.
*4 AT C - 4 3 , "
Self-Diagnosis Function",
see No. 13. *5
AT C - 5 4 , "LAN System Circuit"*6AT C - 6 4 , "Blower Motor Circuit"
*7 EC-193 (VQ35DE) or EC-779
(VK45DE) *8
CO-10, "Changing Engine Coolant"
(VQ35DE) or CO-37, "
Changing En-
gine Coolant" (VK45DE) *9
CO-14, "
Checking Radiator Cap"
(VQ35DE) or CO-42, "
Checking Ra-
diator Cap" (VK45DE)
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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
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