Infiniti M45 (Y34). Manual - part 498

 

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Infiniti M45 (Y34). Manual - part 498

 

 

REFRIGERANT PRESSURE SENSOR

EC-681

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Wiring Diagram

ABS002U6

TBWA0315E

EC-682

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

ABS002U7

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.

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 two ground screws. 
Refer to 

EC-141, "Ground Inspection"

 .

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace ground connections.

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

PBIB1118E

REFRIGERANT PRESSURE SENSOR

EC-683

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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 E34, F34

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 89.
Refer to Wiring Diagram.

4.

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

OK or NG

OK

>> GO TO 6.

NG

>> GO TO 5.

6. 

DETECT MALFUNCTIONING PART

Check the following.

Harness connectors E34, F34

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.

PBIB1113E

Voltage: Approximately 5V

PBIB0188E

Continuity should exist.

EC-684

REFRIGERANT PRESSURE SENSOR

7. 

CHECK REFRIGERANT PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Check harness continuity between ECM terminal 88 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 E34, F34

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. 

REFRIGERANT PRESSURE SENSOR SHIELD CIRCUIT FOR OPEN AND SHORT

1.

Disconnect harness connector E34, F34.

2.

Check harness continuity between harness connector F34 terminal 2 and ground.
Refer to Wiring Diagram.

3.

Also check harness for short to power.

OK or NG

OK

>> GO TO 11.

NG

>> GO TO 10.

10. 

DETECT MALFUNCTIONING PART

Check the following.

Harness connectors E34, F34

Harness for open or short between harness connector F34 and ground.

>> Repair open circuit or short to power in harness or connectors.

11. 

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

ABS002U8

REFRIGERANT PRESSURE SENSOR

Refer to 

ATC-143, "Removal and Installation of Refrigerant Pressure Sensor"

 .

Continuity should exist.

Continuity should exist.

 

 

 

 

 

 

 

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