Component Function Check

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.

      ECM			Voltage
      Connector	+	–
      	Terminal
      F24	48	45	1.0 – 4.0 V

   Is the inspection result normal?

   YES >>

   INSPECTION END

   NO >>

   Refer to Diagnosis Procedure.

Diagnosis Procedure

Diagnosis Procedure

1. CHECK REFRIGERANT PRESSURE SENSOR POWER SUPPLY

   1. Turn ignition switch OFF.

   2. Disconnect refrigerant pressure sensor harness connector.

   3. Turn ignition switch ON.

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

      +		−	Voltage (Approx.)
      Refrigerant pressure sensor
      Connector	Terminal
      E35	3	Ground	5 V

   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 ON.

   2. Disconnect ECM harness connector.

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

      Refrigerant pressure sensor		ECM		Continuity
      Connector	Terminal	Connector	Terminal
      E35	3	F24	43	Existed

   4. Also check harness for short to power.

   Is the inspection result normal?

   YES >>

   Perform trouble diagnosis for power supply circuit.

   NO >>

   Repair or replace malfunctioning part.

3. CHECK REFRIGERANT PRESSURE SENSOR GROUND CIRCUIT

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

      Refrigerant pressure sensor		ECM		Continuity
      Connector	Terminal	Connector	Terminal
      E35	1	F24	45	Existed

   2. Also check harness for short to power.

   Is the inspection result normal?

   YES >>

   GO TO 4.

   NO >>

   Repair or replace malfunctioning part.

4. CHECK REFRIGERANT PRESSURE SENSOR INPUT SIGNAL CIRCUIT

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

      Refrigerant pressure sensor		ECM		Continuity
      Connector	Terminal	Connector	Terminal
      E35	2	F24	48	Existed

   2. Also check harness for short to power.

   Is the inspection result normal?

   YES >>

   GO TO 5.

   NO >>

   Repair or replace malfunctioning part.

5. CHECK INTERMITTENT INCIDENT

   Check intermittent incident. Refer to Intermittent Incident.

   Is the inspection result normal?

   YES >>

   Replace refrigerant pressure sensor. Refer to Removal and Installation.

   NO >>

   Repair or replace malfunctioning part.