Diagnostic Procedure

DIAGNOSTIC PROCEDURE DESCRIPTION

Step	Inspection		Action
1	INSPECT AIR BLOW OUT Does air blow out?	Yes	Go to the next step.
1	INSPECT AIR BLOW OUT Does air blow out?	No	Go to Step 1 of the following troubleshooting. INSUFFICIENT AIR (OR NO AIR) BLOWN FROM VENTS [FULL-AUTO AIR CONDITIONER] AMOUNT OF AIR BLOWN FROM VENTS DOES NOT CHANGE [FULL-AUTO AIR CONDITIONER]
2	INSPECT A/C COMPRESSOR OPERATION Start engine. Turn A/C switch and fan switch on. Does A/C compressor operate?	Yes	Go to Step 1 of the following troubleshooting. AIR FROM VENTS NOT COLD ENOUGH [FULL-AUTO AIR CONDITIONER]
2		No	Go to the next step.
3	INSPECT FOR DTCs IN PCM, CLIMATE CONTROL UNIT, INSTRUMENT CLUSTER, AND FRONT BODY CONTROL MODULE (FBCM) Inspect for DTCs related to the PCM, climate control unit, instrument cluster and front body control module (FBCM) on-board diagnostic system. (See FOREWORD [PCM (SKYACTIV-G 2.0, SKYACTIV-G 2.5)] .) (See DTC DISPLAY [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)] .) (See DTC INSPECTION [INSTRUMENT CLUSTER] .) (See DTC INSPECTION [FRONT BODY CONTROL MODULE (FBCM)] .) Are any DTCs displayed?	Yes	Go to appropriate inspection procedure. (See DTC TABLE [PCM (SKYACTIV-G 2.0, SKYACTIV-G 2.5)] .) (See DTC TABLE [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)] .) (See DTC TABLE [INSTRUMENT CLUSTER] .) (See DTC TABLE [FRONT BODY CONTROL MODULE (FBCM)] .)
3		No	Go to the next step.
4	DETERMINE IF MALFUNCTION CAUSE IS A/C REQUEST SIGNAL OR A/C RELAY OPERATIONAL MALFUNCTION Access PCM PID ACCS using the M-MDS. (See PCM INSPECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .) Start the engine and idle it. Turn the PID ACCS to ON from OFF using the M-MDS simulation function. Is the A/C magnetic clutch engaged?	Yes	Go to the next step.
4		No	Go to Step 9.
5	DETERMINE IF MALFUNCTION CAUSE IS A/C PRESSURE SENSOR SIGNAL OR ELSEWHERE Access PCM PID AC_PRES. (See PCM INSPECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .) Monitor the AC_PRES PID while turning on and off the air conditioner by switching the control panel. Is the PID normal?	Yes	Go to Step 7.
5		No	Go to the next step.
6	INSPECT REFRIGERANT PRESSURE SENSOR Inspect the refrigerant pressure sensor. (See REFRIGERANT PRESSURE SENSOR INSPECTION [FULL-AUTO AIR CONDITIONER] .) Is the refrigerant pressure sensor normal?	Yes	Inspect the following and repair or replace if necessary. Refrigerant charging amount A/C compressor for seizure Then go to Step 15.
6		No	Repair or replace malfunctioning part according to inspection result, then go to Step 15.
7	DETERMINE IF MALFUNCTION CAUSE IS EVAPORATOR TEMPERATURE SENSOR OPERATIONAL SIGNAL OR ELSEWHERE Access climate control unit PID EVA_TMP_SEN. (See PID/DATA MONITOR TABLE [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)] .) Monitor the EVA_TMP_SEN PID while turning on and off the air conditioner by switching the control panel. (See PID/DATA MONITOR TABLE [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)] .) Is the PID normal?	Yes	Go to Step 9.
7		No	Go to the next step.
8	INSPECT EVAPORATOR TEMPERATURE SENSOR Inspect the evaporator temperature sensor. (See EVAPORATOR TEMPERATURE SENSOR INSPECTION [FULL-AUTO AIR CONDITIONER] .) Is the evaporator temperature sensor normal?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between evaporator temperature sensor terminal and climate control unit terminal. If there is a common connector: Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness. Go to Step 15.
8		No	Replace the evaporator temperature sensor, then go to Step 15. (See EVAPORATOR TEMPERATURE SENSOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER] .)
9*	INSPECT TO SEE WHETHER MALFUNCTION (LACK OF CONTINUITY) IS IN A/C CONTROL SIGNAL CIRCUIT (BETWEEN A/C RELAY AND PCM) OR ELSEWHERE Measure the voltage between A/C relay terminal D and body ground under the following conditions. A/C switch is off. A/C switch is on. Is the voltage as follows? A/C on: below 1.0 V A/C off: B+	Yes	Go to Step 14.
9*		No	Go to the next step.
10	INSPECT FUSE Switch the ignition off. Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .) Remove the A/C 7.5 A fuse. Is the fuse normal?	Yes	Go to the next step.
10		No	If the fuse is blown: Refer to the wiring diagram and verify whether or not there is a common connector between A/C 7.5 A fuse and climate control unit terminal. If there is a common connector: Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has a short to ground. Replace the fuse. If the fuse is damaged: Replace the fuse. Then go to Step 15.
11	INSPECT TO SEE WHETHER MALFUNCTION IS IN A/C RELAY OR ELSEWHERE Is the A/C relay normal?	Yes	Go to the next step.
11		No	Replace the A/C relay, then go to Step 15. (See RELAY LOCATION .)
12*	INSPECT WIRING HARNESS BETWEEN FUSE BLOCK AND A/C RELAY FOR LACK OF CONTINUITY Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .) Switch the ignition ON (engine off or on). Measure the voltages at following terminals of A/C relay. Terminal A (A/C relay control signal) Terminal C (A/C control signal) Are voltages B+?	Yes	Go to the next step.
12*		No	Refer to the wiring diagram and verify whether or not there is a common connector between A/C relay terminal and fuse block/front body control module (FBCM) terminal. If there is a common connector: Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness. Go to Step 15.
13*	INSPECT TO SEE WHETHER MALFUNCTION (LACK OF CONTINUITY) IS IN PCM OR WIRING HARNESS (BETWEEN A/C RELAY AND PCM) Switch the ignition off. Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .) Disconnect the PCM connector. Verify continuity at the following terminals between PCM and A/C relay. PCM terminal 2AF (wiring harness-side)- A/C relay terminal E (relay and fuse block side) Is there continuity?	Yes	Inspect the PCM, then go to Step 15. (See PCM INSPECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .)
13*		No	Refer to the wiring diagram and verify whether or not there is a common connector between A/C relay terminal and PCM terminal. If there is a common connector: Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness. Go to Step 15.
14	INSPECT TO SEE WHETHER MALFUNCTION IS IN MAGNETIC CLUTCH OR ELSEWHERE Inspect the magnetic clutch. (See MAGNETIC CLUTCH INSPECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .) Is the magnetic clutch normal?	Yes	Inspect wiring harness between A/C relay and magnetic clutch. If above wiring harness is normal, go to the next step. If above wiring harness malfunctions, repair wiring harness, then go to the next step.
14		No	Replace the magnetic clutch, then go to the next step. (See MAGNETIC CLUTCH DISASSEMBLY/ASSEMBLY [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .)
15	VERIFY THAT MALFUNCTION SYMPTOMS DO NOT RECUR AFTER REPAIR Does cool air discharge from the vents? (Are the results of refrigerant system performance test normal?) (See REFRIGERANT SYSTEM PERFORMANCE TEST .)	Yes	Troubleshooting completed. Explain repairs to customer.
15		No	Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs.