Diagnosis Procedure

1. Disconnect refrigerant pressure sensor harness connector.
2. Turn ignition switch ON.
3. Check the voltage between refrigerant pressure sensor harness connector and ground.

   Refrigerant pressure sensor		Ground	Voltage (V)
   Connector	Terminal
   E77	1	Ground	Approx. 5

Is the inspection result normal?

YES

GO TO 3.

NO

GO TO 2.

Check the following.

• Harness for open or short between ECM and refrigerant pressure sensor
• Loose or poor connection for each connector and harness

Repair open circuit, short to ground or short to power in harness or connectors.

1. Turn ignition switch OFF.
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
   E77	3	F91	13	Existed

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

Is the inspection result normal?

YES

GO TO 5.

NO

GO TO 4.

Check the following.

• Harness for open or short between ECM and refrigerant pressure sensor
• Loose or poor connection for each connector and harness

Repair open circuit, short to ground or short to power in harness or connectors.

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

   Refrigerant pressure sensor		ECM		Continuity
   Connector	Terminal	Connector	Terminal
   E77	2	F91	12	Existed

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

Is the inspection result normal?

YES

GO TO 7.

NO

GO TO 6.

Check the following.

• Harness for open or short between ECM and refrigerant pressure sensor
• Loose or poor connection for each connector and harness

Repair open circuit, short to ground or short to power in harness or connectors.

Refer to Inspection .

Is the inspection result normal?

YES

Replace refrigerant pressure sensor. Refer to REFRIGERANT PRESSURE SENSOR : Removal & Installation .

NO

Repair or replace malfunctioning part.