Nissan Pathfinder (2007 year). Manual - part 224

REFRIGERANT PRESSURE SENSOR

EC-659

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2007 Pathfinder

3. 

CHECK REFRIGERANT PRESSURE SENSOR POWER SUPPLY CIRCUIT

1.

Disconnect refrigerant pressure sensor harness connector.

2.

Turn ignition switch ON.

3.

Check voltage between refrigerant pressure sensor terminal 3
and ground with CONSULT-II or tester.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4.

4. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors E5, F14

●

Harness for open or short between ECM and refrigerant pressure sensor

>> Repair harness or connectors.

5. 

CHECK REFRIGERANT PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check harness continuity between refrigerant pressure sensor terminal 1 and ECM terminal 67.
Refer to Wiring Diagram.

4.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 7.

NG

>> GO TO 6.

6. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors E5, F14

●

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.

BBIA0564E

Voltage: Approximately 5V

PBIB1872E

Continuity should exist.

EC-660

REFRIGERANT PRESSURE SENSOR

2007 Pathfinder

7. 

CHECK REFRIGERANT PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Check harness continuity between ECM terminal 70 and refrigerant pressure sensor terminal 2.
Refer to Wiring Diagram.

2.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 9.

NG

>> GO TO 8.

8. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors E5, F14

●

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-145, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

  .

OK or NG

OK

>> Replace refrigerant pressure sensor.

NG

>> Repair or replace. 

Removal and Installation

UBS00KIL

REFRIGERANT PRESSURE SENSOR

Refer to 

ATC-169, "Removal and Installation for Refrigerant Pressure Sensor"

    or 

MTC-107, "Removal and

Installation for Refrigerant Pressure Sensor"

  .

Continuity should exist.

VIAS

EC-661

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2007 Pathfinder

VIAS

PFP:14956

Description

UBS00KI0

SYSTEM DESCRIPTION

*: ECM determines the start signal status by the signals of engine speed and battery voltage.

When the engine is running at medium speed, the ECM sends the ON signal to the VIAS control solenoid
valve. This signal introduces the intake manifold vacuum into the power valve actuator and therefore closes
the power valve.
Under this condition, the effective intake manifold length is equivalent to the total length of passage A and pas-
sage B. This long intake manifold provides increased amount of intake air, which results in improved suction
efficiency and higher torque.
When engine is running at low or high speed, the ECM sends the OFF signal to the VIAS control solenoid
valve and the power valve is opened.
Under this condition, the effective intake manifold length is equivalent to the length of passage B. This short-
ened intake manifold length results in enhanced engine output due to reduced suction resistance under high
speeds.

COMPONENT DESCRIPTION
Power Valve

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 operated by the vacuum stored in the surge tank. The
vacuum in the surge tank is controlled by the VIAS control solenoid
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

Engine coolant temperature sensor

Engine coolant temperature

Throttle position sensor

Throttle position

Accelerator pedal position sensor

Accelerator pedal position

Battery

Battery voltage*

PBIB1822E

BBIA0569E

EC-662

VIAS

2007 Pathfinder

VIAS Control Solenoid Valve

The VIAS control solenoid valve 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.

CONSULT-II Reference Value in Data Monitor Mode

UBS00KI1

Specification data are reference values.

BBIA0569E

MONITOR ITEM

CONDITION

SPECIFICATION

VIAS S/V

●

Engine: After warming up

2,200 - 3,300 rpm

ON

Except above conditions

OFF

VIAS

EC-663

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2007 Pathfinder

Wiring Diagram

UBS00KI2

BBWA1773E

EC-664

VIAS

2007 Pathfinder

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

29

G

VIAS control solenoid valve

[Engine is running]

●

Idle speed

BATTERY VOLTAGE
(11 - 14V)

[Engine is running]

●

Engine speed: Between 2,200 and 3,300 
rpm.

0 - 1.0V

111

BR

ECM relay
(Self shut-off)

[Engine is running]
[Ignition switch: OFF]

●

For a few seconds after turning ignition 
switch OFF

0 - 1.5V

[Ignition switch: OFF]

●

More than a few seconds passed after turn-
ing ignition switch OFF

BATTERY VOLTAGE
(11 - 14V)

119
120

R
P

Power supply for ECM

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14V)

VIAS

EC-665

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Diagnostic Procedure

UBS00KI3

1. 

CHECK OVERALL FUNCTION

 With CONSULT-II

1.

Start engine and warm it up to normal operating temperature.

2.

Perform “VIAS SOL VALVE” in “ACTIVE TEST” mode with CON-
SULT-II.

3.

Turn VIAS control solenoid valve “ON” and “OFF”, and make
sure that power valve actuator rod moves.

 Without CONSULT-II

1.

Start engine and warm it up to normal operating temperature.

2.

Rev engine up to between 2,200 and 3,300 rpm and make sure
that power valve actuator rod moves.

OK or NG

OK

>> INSPECTION END

NG (With CONSULT-II) >>GO TO 2.
NG (Without CONSULT-II) >>GO TO 3.

PBIB0844E

BBIA0570E

BBIA0570E

EC-666

VIAS

2007 Pathfinder

2. 

CHECK VACUUM EXISTENCE

 With CONSULT-II

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 “ACTIVE TEST” mode with CONSULT-II.

4.

Turn VIAS control solenoid valve “ON” and “OFF”, and check
vacuum existence under the following conditions.

OK or NG

OK

>> Repair or replace power valve actuator.

NG 

>> GO TO 4.

3. 

CHECK VACUUM EXISTENCE

 Without CONSULT-II

1.

Stop engine and disconnect vacuum hose connected to power valve actuator.

2.

Disconnect VIAS control solenoid valve harness connector.

3.

Start engine and let it idle.

4.

Apply 12V of direct current between 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-102, "Vacuum Hose Drawing"

  .

OK or NG

OK

>> GO TO 5.

NG

>> Repair hoses or tubes.

VIAS SOL VALVE

Vacuum

ON

Should exist.

OFF

Should not exist.

PBIB0844E

Condition

Vacuum

12V direct current supply

Should exist.

No supply

Should not exist.

PBIB0845E

SEF109L