Nissan Pathfinder (2006 year). Instruction - part 225

 

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Nissan Pathfinder (2006 year). Instruction - part 225

 

 

REFRIGERANT PRESSURE SENSOR

EC-659

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2006 Pathfinder

REFRIGERANT PRESSURE SENSOR

PFP:92136

Component Description

UBS00KII

The refrigerant pressure sensor is installed at the condenser of the
air conditioner system. The sensor uses an electrostatic volume
pressure transducer to convert refrigerant pressure to voltage. The
voltage signal is sent to ECM, and ECM controls cooling fan system.

BBIA0564E

PBIB2657E

EC-660

REFRIGERANT PRESSURE SENSOR

2006 Pathfinder

Wiring Diagram

UBS00KIJ

BBWA1776E

REFRIGERANT PRESSURE SENSOR

EC-661

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2006 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.

Diagnostic Procedure

UBS00KIK

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 switch ON.

3.

Check voltage between ECM terminal 70 and ground with CON-
SULT-II or tester.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 2.

2. 

CHECK GROUND CONNECTIONS

1.

Turn A/C switch and blower switch OFF.

2.

Turn ignition switch OFF.

3.

Loosen and retighten three ground screws on the body. Refer to 

EC-151, "Ground Inspection"

 .

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace ground connections.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

49

P

Sensor power supply
(Refrigerant pressure sen-
sor/Battery current sensor)

[Ignition switch: ON]

Approximately 5V

67

B

Sensor ground

[Engine is running]

●

Warm-up condition

●

Idle speed

Approximately 0V

70

BR

Refrigerant pressure sensor

[Engine is running]

●

Warm-up condition

●

Both A/C switch and blower switch: ON 
(Compressor operates)

1.0 - 4.0V

Voltage: 1.0 - 4.0V

PBIB1188E

BBIA0539E

EC-662

REFRIGERANT PRESSURE SENSOR

2006 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.

REFRIGERANT PRESSURE SENSOR

EC-663

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2006 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-144, "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-165, "Removal and Installation for Refrigerant Pressure Sensor"

   or 

MTC-106, "Removal and

Installation for Refrigerant Pressure Sensor"

 .

Continuity should exist.

EC-664

VIAS

2006 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

VIAS

EC-665

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2006 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

EC-666

VIAS

2006 Pathfinder

Wiring Diagram

UBS00KI2

BBWA1773E

 

 

 

 

 

 

 

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