Diagnosis Procedure
- CHECK GROUND CONNECTION
- Turn A/C switch and blower fan switch OFF.
- Turn ignition switch OFF.
- Check ground connection E191. Refer to Ground Inspection in Inspection .
Is the inspection result normal?
YES
GO TO 2.
NO
Repair or replace ground connection.
- CHECK REFRIGERANT PRESSURE SENSOR POWER SUPPLY
- Disconnect refrigerant pressure sensor harness connector.
- Turn ignition switch ON.
- Check the voltage between refrigerant pressure sensor harness connector and ground.
+
-
Voltage
(Approx.)
Refrigerant pressure sensor
Connector
Terminal
E162
3
Ground
5 V
Is the inspection result normal?
YES
GO TO 5.
NO
GO TO 3.
- CHECK REFRIGERANT PRESSURE SENSOR POWER SUPPLY CIRCUIT
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Check the continuity between refrigerant pressure sensor harness connector and ECM harness connector.
Refrigerant pressure sensor
ECM
Continuity
Connector
Terminal
Connector
Terminal
E162
3
F142
136
Existed
- Also check harness for short to power and short to ground.
Is the inspection result normal?
YES
GO TO 4.
NO
Repair or replace error-detected parts.
- CHECK SENSOR POWER SUPPLY 2 CIRCUIT
Refer to SENSOR POWER SUPPLY 2 CIRCUIT .
Is the inspection result normal?
YES
Perform the trouble diagnosis for ECM power supply circuit. Refer to Diagnosis Procedure .
NO
Repair or replace error-detected parts.
- CHECK REFRIGERANT PRESSURE SENSOR GROUND CIRCUIT
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Check the continuity between refrigerant pressure sensor harness connector and ECM harness connector.
Refrigerant pressure sensor
ECM
Continuity
Connector
Terminal
Connector
Terminal
E162
1
F142
125
Existed
- Also check harness for short to power and short to ground.
Is the inspection result normal?
YES
GO TO 6.
NO
Repair or replace error-detected parts.
- CHECK REFRIGERANT PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
- Check the continuity between refrigerant pressure sensor harness connector and ECM harness connector.
Refrigerant pressure sensor
ECM
Continuity
Connector
Terminal
Connector
Terminal
E162
2
F142
108
Existed
- Also check harness for short to power and short to ground.
Is the inspection result normal?
YES
GO TO 7.
NO
Repair or replace error-detected parts.
- Check the continuity between refrigerant pressure sensor harness connector and ECM harness connector.
- CHECK INTERMITTENT INCIDENT
Refer to Inspection .
Is the inspection result normal?
YES
Replace refrigerant pressure sensor. Refer to REFRIGERANT PRESSURE SENSOR : Removal & Installation .
NO
Repair or replace error-detected parts.