Refrigerant Pressure Sensor

REFRIGERANT PRESSURE SENSOR

Component Function Check


1. CHECK REFRIGERANT PRESSURE SENSOR 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 terminals under the following conditions.





Is the inspection result normal?
YES- INSPECTION END
NO- Proceed to "Diagnosis Procedure" .


Diagnosis Procedure


1. CHECK REFRIGERANT PRESSURE SENSOR POWER SUPPLY

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 3.
NO- GO TO 2.

2. CHECK REFRIGERANT PRESSURE SENSOR POWER SUPPLY CIRCUIT

1.Turn ignition switch OFF.
2.Disconnect ECM harness connector.
3.Check the continuity between refrigerant pressure sensor harness connector and ECM harness connector.





Is the inspection result normal?
YES- Perform the trouble diagnosis for power supply circuit.
NO- Repair or replace error-detected parts.

3. 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 4.
NO- Repair or replace error-detected parts.

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

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





2.Also check harness for short to ground and short to power.
Is the inspection result normal?
YES- GO TO 5.
NO- Repair or replace error-detected parts.

5. CHECK INTERMITTENT INCIDENT

Check intermittent incident. Refer to "Intermittent Incident" Intermittent Incident.
Is the inspection result normal?
YES- Replace refrigerant pressure sensor. Refer to "REFRIGERANT PRESSURE SENSOR : Removal and Installation" Removal And Installation.
NO- Repair or replace error-detected parts.