Diagnosis Procedure

REFRIGERANT PRESSURE SENSOR


Diagnosis Procedure

1.CHECK GROUND CONNECTION
1. Turn A/C switch and blower fan switch OFF.
2. Turn ignition switch OFF.
3. Check ground connections M16, M70. Refer to Power Supply and Ground Circuit.
3. Check ground connections M16, M70. Refer to Power Supply and Ground Circuit.
Is the inspection result normal?
YES - GO TO 2.
NO - Repair or replace ground connections.
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 E108, M15
- Harness for open or short between ECM and refrigerant pressure sensor
Repair open circuit, 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 E108, M15
- Harness for open or short between ECM and refrigerant pressure sensor
Repair open circuit, 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 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 8.
NO - GO TO 7.
7.DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E108, M15
- Harness for open or short between ECM and refrigerant pressure sensor
Repair open circuit, short to ground or short to power in harness or connectors.
8.CHECK INTERMITTENT INCIDENT
Refer to Description.
Is the inspection result normal?
YES - Replace refrigerant pressure sensor.
NO - Repair or replace malfunctioning part.