Infiniti F50. Manual - part 508

REFRIGERANT PRESSURE SENSOR

EC-673

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Wiring Diagram

EBS00MOH

TBWM0134E

EC-674

REFRIGERANT PRESSURE SENSOR

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

EBS00MOI

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 88 and ground with CON-
SULT-II or tester.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 2.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

88

P

Refrigerant pressure sensor

[Engine is running]

●

Warm-up condition

●

Both A/C switch and blower switch “ON”. 
(Compressor operates.)

1.0 - 4.0V

89

B

Sensor ground

[Engine is running]

●

Warm-up condition

●

Idle speed

Approximately 0V

103

L

Sensor power supply

[Ignition switch “ON”]

Approximately 5V

Voltage: 1.0 - 4.0V

PBIB0187E

REFRIGERANT PRESSURE SENSOR

EC-675

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2. 

CHECK REFRIGERANT PRESSURE SENSOR POWER SUPPLY CIRCUIT

1.

Turn A/C switch and blower switch “OFF”.

2.

Stop engine.

3.

Disconnect refrigerant pressure sensor harness connector.

4.

Turn ignition switch “ON”.

5.

Check voltage between refrigerant pressure sensor terminal 1
and ground with CONSULT-II or tester.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 3.

3. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors E33, F33

●

Harness for open or short between ECM and refrigerant pressure sensor

>> Repair harness or connectors.

4. 

CHECK REFRIGERANT PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch “OFF”.

2.

Check harness continuity between refrigerant pressure sensor terminal 3 and ECM terminal 89.
Refer to Wiring Diagram.

3.

Also check harness for short to ground or short to power.

OK or NG

OK

>> GO TO 6.

NG

>> GO TO 5.

5. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors E33, F33

●

Joint connector-30

●

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.

PBIB0037E

Voltage: Approximately 5V

PBIB0188E

Continuity should exist.

EC-676

REFRIGERANT PRESSURE SENSOR

6. 

CHECK REFRIGERANT PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Disconnect ECM harness connector.

2.

Check harness continuity between ECM terminal 88 and refrigerant pressure sensor terminal 2.
Refer to Wiring Diagram.

3.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 8.

NG

>> GO TO 7.

7. 

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.

8. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

OK or NG

OK

>> Replace refrigerant pressure sensor.

NG

>> Repair or replace. 

Removal and Installation

EBS00MOJ

REFRIGERANT PRESSURE SENSOR

Refer to 

ATC-150, "Refrigerant Pressure Sensor"

 .

Continuity should exist.