Infiniti FX35 / FX45. Manual — part 455
REFRIGERANT PRESSURE SENSOR
EC-581
< SERVICE INFORMATION >
[VQ35DE]
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REFRIGERANT PRESSURE SENSOR
Component Description
INFOID:0000000001326460
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.
PBIB2007E
PBIB2657E
EC-582
< SERVICE INFORMATION >
[VQ35DE]
REFRIGERANT PRESSURE SENSOR
Wiring Diagram
INFOID:0000000001326461
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.
TBWM0312E
REFRIGERANT PRESSURE SENSOR
EC-583
< SERVICE INFORMATION >
[VQ35DE]
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Diagnosis Procedure
INFOID:0000000001326462
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 fan switch ON.
3.
Check voltage between ECM terminal 70 and ground with CON-
SULT-III or tester.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 2.
2.
CHECK GROUND CONNECTIONS
1.
Turn A/C switch and blower fan switch OFF.
2.
Stop engine.
3.
Turn ignition switch OFF.
4.
Loosen and retighten ground screw 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
TER-
MI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
49
PU
Sensor power supply
(Refrigerant pressure sen-
sor)
[Ignition switch: ON]
Approximately 5V
67
B/W
Sensor ground
[Engine is running]
• Warm-up condition
• Idle speed
Approximately 0V
70
L/R
Refrigerant pressure sensor
[Engine is running]
• Warm-up condition
• Both A/C switch and blower fan switch: ON
(Compressor operates)
1.0 - 4.0V
Voltage: 1.0 - 4.0V
PBIB1188E
PBIB2625E
EC-584
< SERVICE INFORMATION >
[VQ35DE]
REFRIGERANT PRESSURE SENSOR
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-III or tester.
OK or NG
OK
>> GO TO 5.
NG
>> GO TO 4.
4.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E18, F48
• 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.
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 and short to power.
OK or NG
OK
>> GO TO 7.
NG
>> GO TO 6.
6.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E18, F48
• 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
PBIB2007E
Voltage: Approximately 5V
PBIB0188E
Continuity should exist.
Continuity should exist.
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