Infiniti FX35 / FX45. Manual - part 604

 

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Infiniti FX35 / FX45. Manual - part 604

 

 

REFRIGERANT PRESSURE SENSOR

EC-1177

< SERVICE INFORMATION >

[VK45DE]

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REFRIGERANT PRESSURE SENSOR

Component Description

INFOID:0000000001327073

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.

PBIB1492E

PBIB2657E

EC-1178

< SERVICE INFORMATION >

[VK45DE]

REFRIGERANT PRESSURE SENSOR

Wiring Diagram

INFOID:0000000001327074

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.

TBWM0265E

REFRIGERANT PRESSURE SENSOR

EC-1179

< SERVICE INFORMATION >

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Diagnosis Procedure

INFOID:0000000001327075

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.

Turn ignition switch OFF.

3.

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

EC-723, "Ground Inspection"

.

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 motor 

switch: ON (Compressor operates)

1.0 - 4.0V

Voltage: 1.0 - 4.0V

PBIB1188E

PBIB2195E

EC-1180

< SERVICE INFORMATION >

[VK45DE]

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 E17, F47
• 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 E17, F47
• 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

PBIB1492E

Voltage: Approximately 5V

PBIB0188E

Continuity should exist.

Continuity should exist.

 

 

 

 

 

 

 

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