Infiniti Q45. Manual — part 527
REFRIGERANT PRESSURE SENSOR
EC-747
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EC
2.
CHECK GROUND CONNECTIONS
1.
Turn A/C switch and blower switch OFF.
2.
Stop engine.
3.
Turn ignition switch OFF.
4.
Loosen and retighten three ground screws on the body.
Refer to
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace ground connections.
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 1
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 E33, F33
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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.
PBIB2417E
PBIB0037E
Voltage: Approximately 5V
PBIB0188E
EC-748
REFRIGERANT PRESSURE SENSOR
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 3 and ECM terminal 67.
Refer to Wiring Diagram.
4.
Also check harness for short to ground or short to power.
OK or NG
OK
>> GO TO 7.
NG
>> GO TO 6.
6.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors E33, F33
●
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.
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 E33, F33
●
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
NBS0027J
REFRIGERANT PRESSURE SENSOR
Refer to
ATC-156, "Removal and Installation of Refrigerant Pressure Sensor"
Continuity should exist.
Continuity should exist.
VARIABLE INDUCTION AIR CONTROL SYSTEM (VIAS)
EC-749
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EC
VARIABLE INDUCTION AIR CONTROL SYSTEM (VIAS)
PFP:14956
Description
NBS0026T
SYSTEM DESCRIPTION
*: 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 is fully closed. Under this condition, the
effective suction port length is equivalent to the total length of the intake manifold collector's suction port
including the intake valve. This long suction port provides increased air intake which results in improved suc-
tion efficiency and higher torque generation.
The surge tank and one-way valve are provided. When engine is running at high speed, the ECM sends the
signal to the VIAS control solenoid valve. This signal introduces the intake manifold vacuum into the power
valve actuator and therefore opens the power valve to two suction passages together in the collector.
Under this condition, the effective port length is equivalent to the length of the suction port provided indepen-
dently for each cylinder. This shortened port length results in enhanced engine output with reduced suction
resistance under high speeds.
The power valve is always open regardless of the engine speed when selector lever position is in N or P.
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*
PBIB1876E
EC-750
VARIABLE INDUCTION AIR CONTROL SYSTEM (VIAS)
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.
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
NBS0026U
Specification data are reference values.
PBIB2421E
PBIB2421E
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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