Diagnosis Procedure

DIAGNOSIS PROCEDURE CHART

Step	Action	YES	NO
1	CHECK REFRIGERANT PRESSURE SENSOR OVERALL FUNCTION Start engine and warm it up to normal operating temperature. Turn A/C switch and blower fan switch ON. Check voltage between ECM terminal 70 and ground with SDT or tester. Courtesy of SUZUKI OF AMERICA CORP. Voltage: 1.0 - 4.0V OK or NG	INSPECTION END	GO TO 2.
2	CHECK GROUND CONNECTIONS Turn A/C switch and blower fan switch OFF. Stop engine. Loosen and retighten two ground screws on the body. Refer to [POWER SUPPLY AND GROUND CIRCUIT CHECK ]. Courtesy of SUZUKI OF AMERICA CORP. OK or NG	GO TO 3.	Repair or replace ground connections.
3	CHECK REFRIGERANT PRESSURE SENSOR POWER SUPPLY CIRCUIT Disconnect refrigerant pressure sensor harness connector. Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP. 2. Turn ignition switch ON. 3. Check voltage between refrigerant pressure sensor terminal 3 and ground with SDT or tester. Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP. Voltage: Approximately 5V OK or NG	GO TO 5.	GO TO 4.
4	DETECT MALFUNCTIONING PART Check the following. Harness connectors E5, F14 Harness for open or short between ECM and refrigerant pressure sensor	Repair harness or connectors.
5	CHECK REFRIGERANT PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT Turn ignition switch OFF. Disconnect ECM harness connector. Check harness continuity between refrigerant pressure sensor terminal 1 and ECM terminal 67. Refer to WIRING DIAGRAM . Continuity should exist. Also check harness for short to ground and short to power. OK or NG	GO TO 7.	GO TO 6.
6	DETECT MALFUNCTIONING PART Check the following. Harness connectors E5, F14 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.
7	CHECK REFRIGERANT PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT Check harness continuity between ECM terminal 70 and refrigerant pressure sensor terminal 2. Refer to WIRING DIAGRAM . Continuity should exist. Also check harness for short to ground and short to power. OK or NG	GO TO 9.	GO TO 8.
8	DETECT MALFUNCTIONING PART Check the following. Harness connectors E5, F14 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.
9	CHECK INTERMITTENT INCIDENT Refer to [SERVICE INFORMATION FOR ELECTRICAL INCIDENT: INTERMITTENT INCIDENT ] OK or NG	Replace refrigerant pressure sensor.	Repair or replace.