Nissan Xterra. Manual - part 339

EC-482

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REFRIGERANT PRESSURE SENSOR

REFRIGERANT PRESSURE SENSOR

Component Description

INFOID:0000000009484233

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.

Diagnosis Procedure

INFOID:0000000009484234

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 63 and ground with CONSULT 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. Turn ignition switch OFF.

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

EC-152, "Ground Inspection"

.

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace ground connections.

BBIA0564E

PBIB2657E

Voltage: 1.0 - 4.0V

BBIA0539E

REFRIGERANT PRESSURE SENSOR

EC-483

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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 3

and ground with CONSULT or tester.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4.

4.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors E5, F14

• Harness for open or short between ECM and refrigerant pressure sensor

>> Repair 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 1 and ECM terminal 64.

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 E5, F14

• 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 63 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 E5, F14

• 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.

Voltage: Approximately 5V

BBIA0564E

Continuity should exist.

Continuity should exist.

EC-484

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[VQ40DE]

REFRIGERANT PRESSURE SENSOR

9.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

OK or NG

OK

>> Replace refrigerant pressure sensor. Refer to 

HA-36, "Removal and Installation"

.

NG

>> Repair or replace. 

VIAS

EC-485

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VIAS

Diagnosis Procedure

INFOID:0000000009484235

1.

CHECK OVERALL FUNCTION

 With CONSULT

1. Start engine and warm it up to normal operating temperature.

2. Perform “VIAS S/V-1” in “ACTIVE TEST” mode with CONSULT.

3. Turn VIAS control solenoid valve “ON” and “OFF”, and make

sure that power valve actuator rod moves.

 Without CONSULT

1. Start engine and warm it up to normal operating temperature.

2. Rev engine up to between 2,200 and 3,300 rpm and make sure

that power valve actuator rod moves.

OK or NG

OK

>> INSPECTION END

NG (With CONSULT) >>GO TO 2.

NG (Without CONSULT) >>GO TO 3.

2.

CHECK VACUUM EXISTENCE

 With CONSULT

1. Stop engine and disconnect vacuum hose connected to power valve actuator.

2. Start engine and let it idle.

3. Perform “VIAS S/V-1” in “ACTIVE TEST” mode with CONSULT.

4. Turn VIAS control solenoid valve “ON” and “OFF”, and check vacuum existence under the following condi-

tions.

OK or NG

OK

>> Repair or replace power valve actuator.

NG 

>> GO TO 4.

3.

CHECK VACUUM EXISTENCE

 Without CONSULT

1. Stop engine and disconnect vacuum hose connected to power valve actuator.

2. Disconnect VIAS control solenoid valve harness connector.

3. Start engine and let it idle.

4. Apply 12V of direct current between VIAS control solenoid valve terminals 1 and 2.

5. Check vacuum existence under the following conditions.

1

: Power valve actuator

AWBIA0689ZZ

1

: Power valve actuator

AWBIA0689ZZ

VIAS SOL VALVE

Vacuum

ON

Should exist.

OFF

Should not exist.