Nissan Altima 2007-2012 Service Manual: Refrigerant pressure sensor

Description

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.

Component Function Check

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 the voltage between ECM harness connector and ground.

Is the inspection result normal? YES >> INSPECTION END NO >> Go to EC-482, "Diagnosis Procedure".

Diagnosis Procedure

1.CHECK GROUND CONNECTION

1. Turn A/C switch and blower fan switch OFF.

2. Stop engine.

3. Turn ignition switch OFF.

4. Check ground connection E9. Refer to Ground Inspection in GI-45, "Circuit Inspection".

Is the inspection result normal? YES >> GO TO 2.

NO >> Repair or replace ground connection.

2.CHECK REFRIGERANT PRESSURE SENSOR POWER SUPPLY CIRCUIT

1. Disconnect refrigerant pressure sensor harness connector.

2. Turn ignition switch ON.

3. Check the voltage between refrigerant pressure sensor harness connector and ground.

Is the inspection result normal? YES >> GO TO 4.

NO >> GO TO 3.

3.DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors F1, E3

• 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.

4.CHECK REFRIGERANT PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check the continuity between refrigerant pressure sensor harness connector and ECM harness connector.

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

Is the inspection result normal? YES >> GO TO 6.

NO >> GO TO 5.

5.DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors F1, E3

• 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.

6.CHECK REFRIGERANT PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Check the continuity between ECM harness connector and refrigerant pressure sensor harness connector.

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

Is the inspection result normal? YES >> GO TO 8.

NO >> GO TO 7.

7.DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors F1, E3

• 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 GI-42, "Intermittent Incident".

Is the inspection result normal? YES >> Replace refrigerant pressure sensor.

NO >> Repair or replace.

    Positive crankcase ventilation
    Description This system returns blow-by gas to the intake manifold. The positive crankcase ventilation (PCV) valve is provided to conduct crankcase blow-by gas to the intake manifold. Duri ...

    Ecu diagnosis
    ECM Reference Value VALUES ON THE DIAGNOSIS TOOL Remarks: ● Specification data are reference values. ● Specification data are output/input values which are detected or supplied b ...

    Other materials:

    Water pump
    Removal and Installation 1. Water pump 2. O-rings WARNING: Never remove the radiator cap when the engine is hot. Serious burns could occur from high pressure coolant escaping from the radiator. CAUTION: • When removing water pump assembly, be careful not to get coolant on drive belt. ...

    Control linkage
    Exploded View 1. Control lever knob 2. Control lever 3. Control device assembly 4. Retainer grommet 5. Select cable 6. Shift cable 7. Lock plate 8. Cable bracket Removal and Installation REMOVAL 1. Shift control lever to the neutral position. 2. Remove the air filter assembly. Refer ...

    Control valve
    Exploded View COMPONENT PARTS LOCATION 1. Transaxle assembly 2. Control valve 3. Bracket 4. O-ring 5. Oil strainer assembly 6. Magnet 7. Oil pan bolt 8. Oil pan 9. Oil pan gasket 10. Lock nut 11. Washer 12. Manual plate 13. Collar 14. Lip seal 15. Snap ring A. CVT unit connector ...