2008 INFINITI FX35 air condition

REFRIGERANT PRESSURE SENSOREC-1179
< SERVICE INFORMATION > [VK45DE]
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Diagnosis ProcedureINFOID:0000000001327075
1.CHECK REFRIGERANT PRESSURE
SENSOR OVERALL FUNCTION
1. Start engine and warm it up to normal operating temperature.
2. Turn A/C switch and blower fan switch ON.
3. Check voltage between ECM terminal 70 and ground with CON- SULT-III or tester.
OK or NG
OK >> INSPECTION END
NG >> GO TO 2.
2.CHECK GROUND CONNECTIONS
1. Turn A/C switch and blower fan switch OFF.
2. Turn ignition switch OFF.
3. Loosen and retighten three ground screws on the body. Refer to EC-723, "
Ground Inspection".
OK or NG
OK >> GO TO 3.
NG >> Repair or replace ground connections.
3.CHECK REFRIGERANT PRESSURE SE NSOR POWER SUPPLY CIRCUIT
TER-
MI-
NAL
NO. WIRE
COLOR ITEM CONDITION DATA (DC Voltage)
49 PU Sensor power supply
(Refrigerant pressure sen-
sor)
[Ignition switch: ON]
Approximately 5V
67 B/W Sensor ground [Engine is running]

Warm-up condition
 Idle speed Approximately 0V
70 L/R Refrigerant pressure sensor [Engine is running]

Warm-up condition
 Both A/C switch and blower fan motor switch: ON (Compressor operates) 1.0 - 4.0V
Voltage: 1.0 - 4.0V
PBIB1188E
PBIB2195E
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EC-1184
< SERVICE INFORMATION >[VK45DE]
SNOW MODE SWITCH
OK or NG
OK >> GO TO 2.
NG >> GO TO 3.
2.CHECK SNOW MODE SWIT
ICH OVERALL FUNCTION-II
1. Turn ignition switch ON.
2. Start engine.
3. Check the snow indicator lamp under the following condition.
OK or NG
OK >> INSPECTION END
NG >> GO TO 7.
3.CHECK DTC WITH “UNIFIED METER AND A/C AMP.”
Refer to DI-27, "
CONSULT-III Function (METER/M&A)".
OK or NG
OK >> GO TO 4.
NG >> Go to DI-26
.
4.CHECK SNOW MODE SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect snow mode switch harness connector.
3. Turn ignition switch ON.
4. Check voltage between snow mode switch terminal 1 and ground with CONSULT-III or tester.
OK or NG
OK >> GO TO 6.
NG >> GO TO 5.
5.DETECT MALFUNCTIONING PART
Check the following.
 10A fuse
 Harness for open or short between snow mode switch and fuse.
>> Repair open circuit or short to ground or short to power in harness or connectors.
6.CHECK SNOW MODE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect “unified meter and A/C amp.” harness connector.
3. Check harness continuity between snow mode switch terminal 4 and “unified meter and A/C amp.” termi-
nal 12. Refer to Wiring Diagram.
CONDITION INDICATION
Snow mode switch: ON ON
Snow mode switch: OFF OFF
CONDITION INDICATOR LAMP
Snow mode switch: ON Illuminated
Snow mode switch: OFF Not illuminated
Voltage: Battery voltage.
PBIB2562E
Continuity should exist.
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
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VARIABLE INDUCTION AIR CONTROL SYSTEM (VIAS)
EC-1187
< SERVICE INFORMATION > [VK45DE]
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VARIABLE INDUCTION AI
R CONTROL SYSTEM (VIAS)
DescriptionINFOID:0000000001327082
SYSTEM DESCRIPTION
*: The ECM determines the start signal status by the signals of engine speed and battery voltage.
When the engine is running at low or medium speed, the power valve isfully closed. Under this condition, the
effective suction port length is equivalentto the total lengt h of the intake manifold collector's suction port includ-
ingthe intake valve. This long suction port provides incr eased air intake whichresults in improved suction effi-
ciency and higher torque generation.
The surge tank and one-way valve are provided. When engine is runningat high speed, the ECM sends the
signal to the VIAS control solenoid valve.This signal introduces the intake manifold vacuum into the power
valve actuatorand therefore opens the power valve to two suction passages together in thecollector.
Under this condition, the effective port length is equi valent to thelength of the suction port provided indepen-
dently for each cylinder. Thisshortened port length results in enhanced engine output with reduced suctionre-
sistance under high speeds.
The power valve is always open regardless of the engine speed when gear position is in N or P.
COMPONENT DESCRIPTION
Power Valve
Sensor Input signal to ECM ECM function Actuator
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE) Engine speed*
VIAS control VIAS control solenoid valve
Mass air flow sensor Amount of intake air
Throttle position sensor Throttle position
Accelerator pedal position sensor Accelerator pedal position
Battery Battery voltage*
Engine coolant temperature sensor Engine coolant temperature
PBIB1876E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

EC-1188
< SERVICE INFORMATION >[VK45DE]
VARIABLE INDUCTION AIR CONTROL SYSTEM (VIAS)
The power valve is installed in intake manifold collector and used to
control the suction passage of the variable induction air control sys-
tem. It is set in the fully closed or fully opened position by the power
valve actuator (1) operated by the
vacuum stored in the surge tank.
The vacuum in the surge tank is controlled by the VIAS control sole-
noid valve.
 : Vehicle front
VIAS Control Solenoid Valve
The VIAS control solenoid valve (1) cuts the intake manifold vacuum
signal for power valve control. It responds to ON/OFF signals from
the ECM. When the solenoid is off, the vacuum signal from the
intake manifold is cut. When the ECM sends an ON signal the coil
pulls the plunger downward and feeds the vacuum signal to the
power valve actuator.
 Vacuum tank (2)
CONSULT-III Reference Value in Data Monitor ModeINFOID:0000000001327083
PBIB3237E
PBIB3236E
MONITOR ITEM CONDITION SPECIFICATION
VIAS S/V  Selector lever: P or N
ON
 Engine speed: More than 5,000 rpm
 Selector lever: Except P or N
 Engine speed: Less than 5,000 rpm OFF
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EC-1190
< SERVICE INFORMATION >[VK45DE]
VARIABLE INDUCTION AIR CONTROL SYSTEM (VIAS)
Diagnosis Procedure
INFOID:0000000001327085
1.CHECK OVERALL FUNCTION
With CONSULT-III
1. Start engine and warm it up to normal operating temperature.
2. Perform “VIAS SOL VALVE” in “A CTIVE TEST” mode with CONSULT-III.
3. Turn VIAS control solenoid valve ON and OFF, and make sure that power valve actuator (1) rod moves.
Without CONSULT-III
1. Lift up the vehicle.
2. Start engine and warm it up to normal operating temperature.
3. Make sure that power valve actuator (1) rod moves when chang- ing the gear position to N and D alternately.
OK or NG
OK >> INSPECTION END
NG (With CONSULT-III)>>GO TO 2.
NG (Without CONSULT-III)>>GO TO 3.
2.CHECK VACUUM EXISTENCE
With CONSULT-III
1. Stop engine and disconnect vacuum hose connected to power valve actuator.
2. Start engine and let it idle.
3. Perform “VIAS SOL VALVE” in “A CTIVE TEST” mode with CONSULT-III.
4. Turn VIAS control solenoid valve “ON” and “OFF”, and check vacuum existence under the following condi-
tions.
TER-
MI-
NAL
NO. WIRE
COLOR ITEM CONDITION DATA (DC Voltage)
29 GY VIAS control solenoid valve [Engine is running]
 Selector lever: P or N
0 - 1.0V
[Engine is running]
 Selector lever: D
 Engine speed: Below 5,000 rpm BATTERY VOLTAGE
(11 - 14V)
[Engine is running]
 Engine speed: Above 5,000 rpm 0 - 1.0V
PBIB3249E
PBIB3249E
VIAS SOL VALVE Vacuum
ON Should exist.
OFF Should not exist.
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3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

VARIABLE INDUCTION AIR CONTROL SYSTEM (VIAS)
EC-1191
< SERVICE INFORMATION > [VK45DE]
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OK or NG
OK >> Repair or replace power valve actuator.
NG >> GO TO 4.
3.CHECK VACUUM EXISTENCE
Without CONSULT-III
1. Stop engine and disconnect vacuum hose connected to power valve actuator.
2. Disconnect VIAS control solenoid valve (1) harness connector.
- Vacuum tank (2)
3. Start engine and let it idle.
4. Apply 12V of direct current bet ween VIAS control solenoid valve
terminals 1 and 2.
5. Check vacuum existence under the following conditions.
OK or NG
OK >> Repair or replace power valve actuator.
NG >> GO TO 4.
4.CHECK VACUUM HOSE
1. Stop engine.
2. Check hoses and tubes between intake manifold and power valve actuator for crack, clogging, improper connection or dis-
connection. Refer to EC-684, "
Vacuum Hose Drawing".
OK or NG
OK >> GO TO 5.
NG >> Repair hoses or tubes.
5.CHECK VACUUM TANK
Refer to EC-1193, "
Component Inspection".
OK or NG
OK >> GO TO 6.
NG >> Replace vacuum tank.
6.CHECK VIAS CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
PBIB3236E
Condition Vacuum
12V direct current supply Should exist
No supply Should not exist
PBIB0845E
SEF109L
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3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

VARIABLE INDUCTION AIR CONTROL SYSTEM (VIAS)
EC-1193
< SERVICE INFORMATION > [VK45DE]
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Component InspectionINFOID:0000000001327086
VIAS CONTROL SOLENOID VALVE
With CONSULT-III
1. Reconnect harness connectors disconnected.
2. Turn ignition switch ON.
3. Perform “VIAS SOL VALVE”
in “ACTIVE TEST” mode.
4. Check air passage continuity and operation delay time under the following conditions.
Operation takes less than 1 second.
Without CONSULT-III
Check air passage continuity and operation delay time under the fol-
lowing conditions.
Operation takes less than 1 second.
VACUUM TANK
1. Disconnect vacuum hose connected to vacuum tank.
2. Connect a vacuum pump to the port A of vacuum tank.
3. Apply vacuum and make sure that vacuum exists at the port B.
Removal and InstallationINFOID:0000000001327087
VIAS CONTROL SOLENOID VALVE
Refer to EM-175.
Condition
VIAS SOL VALVE Air passage continuity
between A and B Air passage continuity
between A and C
ON Yes No
OFF No Yes
JMBIA0180ZZ
Condition Air passage continuity
between A and B Air passage continuity
between A and C
12V direct current supply
between terminals 1 and 2 Ye s N o
No supply No Yes
MEC488B
PBIB0846E
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EC-1196
< SERVICE INFORMATION >[VK45DE]
SERVICE DATA AND SPECIFICATIONS (SDS)
SERVICE DATA AND SPECIFICATIONS (SDS)
Fuel PressureINFOID:0000000001327089
Idle Speed and Ignition TimingINFOID:0000000001327090
*: Under the following conditions:
 Air conditioner switch: OFF
 Electric load: OFF (Lights, heater fan & rear window defogger)
 Steering wheel: Kept in straight-ahead position
Calculated Load ValueINFOID:0000000001327091
Mass Air Flow SensorINFOID:0000000001327092
*: Engine is warmed up to normal operating temperature and running under no load.
Intake Air Temperature SensorINFOID:0000000001327093
Engine Coolant Te
mperature SensorINFOID:0000000001327094
Fuel Tank Temperature SensorINFOID:0000000001327095
Fuel pressure at idling kPa (kg/cm2, psi) Approximately 350 (3.57, 51)
Target idle speed No load* (in P or N position) 650
±50 rpm
Air conditioner: ON In P or N position 700 rpm or more
Ignition timing In P or N position 12 ° ± 5 ° BTDC
Condition Calculated load value% (Using CONSULT-III or GST)
At idle 14.0 - 33.0
At 2,500 rpm 12.0 - 25.0
Supply voltageBattery voltage (11 - 14V)
Output voltage at idle 1.0 - 1.3V*
Mass air flow (Using CONSULT-III or GST) 2.0 - 6.0 g·m/sec at idle*
7.0 - 20.0 g·m/sec at 2,500 rpm*
Temperature °C ( °F) Resistance k Ω
25 (77) 1.800 - 2.200
Temperature °C ( °F) Resistance k Ω
20 (68) 2.1 - 2.9
50 (122) 0.68 - 1.00
90 (194) 0.236 - 0.260
Temperature °C ( °F) Resistance k Ω
20 (68) 2.3 - 2.7
50 (122) 0.79 - 0.90
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