Nissan Pathfinder (2007 year). Manual — part 224
REFRIGERANT PRESSURE SENSOR
EC-659
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EC
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
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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2007 Pathfinder
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
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
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