INFINITI FX35 2008 Service Manual

REFRIGERANT PRESSURE SENSOREC-1181
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OK >> GO TO 9.
NG >> GO TO 8.
8.DETECT MALFUNCTIONING PART
Check the following.
 Harness connectors E17, F47
 Harness for open or short between ECM and refrigerant pressure sensor
>> Repair open circuit or short to ground or short to power in harness or connectors.
9.CHECK INTERMITTENT INCIDENT
Refer to EC-717
.
OK or NG
OK >> Replace refrigerant pressure sensor.
NG >> Repair or replace.
Removal and InstallationINFOID:0000000001327076
REFRIGERANT PRESSURE SENSOR
Refer to ATC-137, "Removal and Installation of Refrigerant Pressure Sensor".
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EC-1182
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SNOW MODE SWITCH
SNOW MODE SWITCH
DescriptionINFOID:0000000001327077
The snow mode switch signal is sent to the “unifi
ed meter and A/C amp.” from the snow mode switch. The
“unified meter and A/C amp.” then sends the signal to the ECM by CAN communication line.
The snow mode is used for driving or starting the vehicle on snowy roads or slippery areas. If the snow mode
is activated, the vehicle speed will not be accelerated i mmediately than your original pedal in due to avoid the
vehicle slip. In other words, ECM controls the rapi d engine torque change by controlling the electric throttle
control actuator operating speed.
CONSULT-III Reference Value in Data Monitor ModeINFOID:0000000001327078
MONITOR ITEM CONDITION SPECIFICATION
SNOW MODE SW  Ignition switch: ON Snow mode switch: ON ON
Snow mode switch: OFF OFF
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SNOW MODE SWITCHEC-1183
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Wiring DiagramINFOID:0000000001327079
Diagnosis ProcedureINFOID:0000000001327080
1.CHECK SNOW MODE SWIT
ICH OVERALL FUNCTION-I
1. Turn ignition switch ON.
2. Select “SNOW MODE SW” in “DAT A MONITOR” mode with CONSULT-III.
3. Check “SNOW MODE SW” indication under the following conditions.
TBWM1369E
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EC-1184
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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.
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SNOW MODE SWITCHEC-1185
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4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 9.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
7.CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body. Refer to EC-723, "
Ground Inspection".
OK or NG
OK >> GO TO 8.
NG >> Repair or replace ground connections.
8.CHECK SNOW MODE INDICATOR LAMP GROUND CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between snow mode switch terminal 2 and ground. Refer to Wiring Diagram.
2. Also check harness for short to power.
OK or NG
OK >> GO TO 9.
NG >> Repair open circuit or short to power in harness or connectors.
9.CHECK SNOW MODE SWITCH
Refer to EC-1185, "
Component Inspection".
OK or NG
OK >> GO TO 10.
NG >> Replace snow mode switch.
10.CHECK INTERMITTENT INCIDENT
Refer to EC-717
.
>> INSPECTION END
Component InspectionINFOID:0000000001327081
SNOW MODE SWITCH
PBIB2195E
Continuity should exist.
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EC-1186
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SNOW MODE SWITCH
1. Check continuity between snow mode switch terminals 1 and 4
under the following conditions.
2. If NG, replace snow mode switch. If OK, go to following step.
3. Check continuity between snow mode switch terminals 2 and 4 under the following conditions.
4. If NG, replace snow mode switch.
CONDITION CONTINUITY
Snow mode switch: ON Should exist
Snow mode switch: OFF Should not exist
PBIB2563E
CONDITION CONTINUITY 1 Should exist
2 Should not exist
PBIB2564E
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VARIABLE INDUCTION AIR CONTROL SYSTEM (VIAS)
EC-1187
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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
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EC-1188
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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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VARIABLE INDUCTION AIR CONTROL SYSTEM (VIAS)
EC-1189
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Wiring DiagramINFOID:0000000001327084
Specification data are reference values
and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals wh en measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground ot her than ECM terminals, such as the ground.
TBWM1370E
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EC-1190
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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-
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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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