NO COOL AIRFLOW FROM VENT [FULL-AUTO AIR CONDITIONER]

DESCRIPTION

• Magnetic clutch does not operate

• No cool airflow even if airflow temperature setting is MAX COLD

POSSIBLE CAUSE

Note

• If the engine coolant temperature increases due to a cooling system malfunction, the fail-safe function disables the A/C operation.

• i-stop system operation malfunction (A/C system operation malfunction while i-stop function is operating)

• A/C request signal is not input to PCM

― Communication error between climate control unit and instrument cluster

― Communication error between instrument cluster and PCM

• Magnetic clutch malfunction

― Operation malfunction

― Clearance adjustment malfunction

• Refrigerant pressure sensor malfunction

• A/C compressor malfunction

• Improper refrigerant charging amount

• Evaporator temperature sensor malfunction

• Open circuit or short to ground in wiring harness between evaporative temperature sensor and climate control unit

• Instrument cluster malfunction

• PCM A/C cut control system malfunction

― Accelerator pedal position sensor malfunction

― Engine coolant temperature sensor malfunction

― Cooling system malfunction

• Front climate control unit malfunction

• Open circuit or short to ground in wiring harness between PCM and A/C relay

• A/C 7.5 A fuse malfunction

― A/C 7.5 A fuse damaged or blown

• Short to ground in wiring harness between A/C 7.5 A fuse, A/C relay, and magnetic clutch

• Open circuit in wiring harness between A/C relay and magnetic clutch

• A/C relay malfunction

• When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while performing the inspection to discover whether poor contact points are the cause of any intermittent malfunctions. If there is a problem, check to make sure connectors, terminals and wiring harnesses are connected correctly and undamaged.

Step	Inspection		Action
1	CHECK MALFUNCTION SYMPTOMS • Is malfunctions occur in only when operating the i-stop?	Yes	Perform the i-stop troubleshooting. (See FOREWORD [PCM (SKYACTIV-G 2.5)].) (See FOREWORD [PCM (SKYACTIV-D 2.2)].)
1		No	Go to the next step.
2	VERIFY AIRFLOW CONDITION • Switch the ignition ON (engine off or on). • Set the airflow volume control dial to 1 or more. • Does air flow from the vent after operating the blower motor?	Yes	Go to the next step.
2		No	Go to Step 1 of the following troubleshooting. • INSUFFICIENT AIR (OR NO AIR) BLOWN FROM FRONT VENTS [FULL-AUTO AIR CONDITIONER] • INSUFFICIENT AIR (OR NO AIR) BLOWN FROM REAR VENTS [FULL-AUTO AIR CONDITIONER] • AMOUNT OF AIR BLOWN FROM FRONT VENTS DOES NOT CHANGE [FULL-AUTO AIR CONDITIONER] • AMOUNT OF AIR BLOWN FROM REAR VENTS DOES NOT CHANGE [FULL-AUTO AIR CONDITIONER]
3	INSPECT A/C COMPRESSOR OPERATION • Start engine. • Turn A/C switch on. • Does A/C compressor operate?	Yes	Go to Step 1 of the following troubleshooting. (See REFRIGERANT SYSTEM INEFFECTIVE [FULL-AUTO AIR CONDITIONER].)
3		No	Go to the next step.
4	VERIFY DTCs FOR RELATED MODULES • Verify DTCs using the M-MDS. ― PCM (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.5)].) (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 2.2)].) ― Climate control unit (See DTC DISPLAY [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].) ― Instrument cluster (See DTC INSPECTION [INSTRUMENT CLUSTER].) ― Front body control module (FBCM) (See DTC INSPECTION [FRONT BODY CONTROL MODULE (FBCM)].) • Are any DTCs displayed?	Yes	Go to the applicable DTC inspection. ― PCM (See DTC TABLE [PCM (SKYACTIV-G 2.5)].) (See DTC TABLE [PCM (SKYACTIV-D 2.2)].) ― Climate control unit (See DTC TABLE [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].) ― Instrument cluster (See DTC TABLE [INSTRUMENT CLUSTER].) ― Front body control module (FBCM) (See DTC TABLE [FRONT BODY CONTROL MODULE (FBCM)].)
4		No	Go to the next step.
5	VERIFY MAGNETIC CLUTCH OPERATION • Access PCM PID ACCS using the M-MDS. (See PCM INSPECTION [SKYACTIV-G 2.5].) (See PCM INSPECTION [SKYACTIV-D 2.2].) • Start engine. • Turn the PID ACCS to ON from OFF using the M-MDS simulation function. (See PCM INSPECTION [SKYACTIV-G 2.5].) (See PCM INSPECTION [SKYACTIV-D 2.2].) • Is the magnetic clutch engaged/disengaged according to the simulation function operation?	Yes	Go to the next step.
5		No	Go to Step 10.
6	VERIFY MEASURED VALUE OF A/C PRESSURE SENSOR • Access PCM PID AC_PRES using the M-MDS. (See PCM INSPECTION [SKYACTIV-G 2.5].) (See PCM INSPECTION [SKYACTIV-D 2.2].) • 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 8.
6		No	Go to the next step.
7	INSPECT REFRIGERANT PRESSURE SENSOR • Inspect the refrigerant pressure sensor. (See REFRIGERANT PRESSURE SENSOR INSPECTION.) • Is the refrigerant pressure sensor normal?	Yes	Inspect the following and repair or replace if necessary. • Refrigerant charge amount (if refrigerant has discharged completely, replace receiver/drier(^*1)) (See RECEIVER/DRIER REMOVAL/INSTALLATION [SKYACTIV-G 2.5].) (See RECEIVER/DRIER REMOVAL/INSTALLATION [SKYACTIV-D 2.2].) • A/C compressor (See A/C COMPRESSOR REMOVAL/INSTALLATION [SKYACTIV-G 2.5].) (See A/C COMPRESSOR REMOVAL/INSTALLATION [SKYACTIV-D 2.2].) Go to Step 16.
7		No	Replace refrigerant pressure sensor, then go to Step 16. (See REFRIGERANT PRESSURE SENSOR REMOVAL/INSTALLATION.)
8	VERIFY MEASURED VALUE OF EVAPORATOR TEMPERATURE SENSOR • Access climate control unit PID EVA_TMP_SEN using the M-MDS. (See PID/DATA MONITOR TABLE [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].) • Turn the climate control unit A/C switch on and off while the PID EVA_TMP_SEN is displayed. • Is the PID normal?	Yes	Go to Step 16.
8		No	Go to the next step.
9	INSPECT EVAPORATOR TEMPERATURE SENSOR • Inspect the evaporator temperature sensor. (See EVAPORATOR TEMPERATURE SENSOR INSPECTION.) • 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. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness. Go to Step 16.
9		No	Replace the evaporator temperature sensor, then go to Step 16. (See EVAPORATOR TEMPERATURE SENSOR REMOVAL/INSTALLATION.)
10	DETERMINE IF MALFUNCTION IS CAUSED BY A/C RELAY CIRCUIT MALFUNCTION OR PCM MALFUNCTION • Short circuit between A/C relay terminal E (A/C control signal) and ground. • Is there cool airflow?	Yes	Repair the short circuit and go to the next step.
10		No	Go to Step 13.
11^*	INSPECT WIRING HARNESS BETWEEN A/C RELAY AND PCM • Inspect the terminal voltage of the PCM A/C relay control signal. • Is the voltage B+?	Yes	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. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness. Go to Step 16.
11^*		No	Go to the next step.
12	INSPECT MAGNETIC CLUTCH • Inspect the magnetic clutch. (See MAGNETIC CLUTCH INSPECTION.) • Is the magnetic clutch normal?	Yes	Go to the next step.
12		No	Replace the magnetic clutch, then go to Step 16. (See MAGNETIC CLUTCH DISASSEMBLY/ASSEMBLY [SKYACTIV-G 2.5].) (See MAGNETIC CLUTCH DISASSEMBLY/ASSEMBLY [SKYACTIV-D 2.2].)
13	INSPECT FUSE • Inspect A/C 7.5 A fuse • Is the fuse normal?	Yes	Go to the next step.
13		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 magnetic clutch 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. Go to Step 16.
14^*	INSPECT A/C RELAY POWER SUPPLY CIRCUIT • Measure the voltage at the following terminals (wiring harness-side): ― A/C relay terminal A (A/C relay control signal) ― A/C relay terminal C (A/C control signal) • Is the voltage B+?	Yes	Go to the next step.
14^*		No	Refer to the wiring diagram and verify whether or not there is a common connector between A/C relay terminal and A/C 7.5 A fuse terminal / 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. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness. Go to Step 16.
15^*	INSPECT WIRING HARNESS BETWEEN A/C RELAY AND MAGNETIC CLUTCH • Measure the voltage at the following terminals (wiring harness-side): ― A/C relay terminal D (magnetic clutch drive signal) • Is the voltage B+?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between A/C relay terminal and magnetic clutch 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. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness. Go to the next step.
15^*		No	Replace the A/C relay, then go to the next step. (See RELAY LOCATION.)
16	VERIFY THAT MALFUNCTION SYMPTOM DOES 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.
16		No	Recheck malfunction symptoms, then repeat from Step 1 if the malfunction recurs.

*1 :If the refrigerant has completely leaked out, ambient air may penetrate the refrigerant system and the desiccant in the receiver/drier may absorb moisture in the ambient air resulting in saturation. If the refrigerant system is used under this condition, rust may generate in the A/C compressor due to the moisture, causing secondary problems such as A/C compressor lock or abnormal noise. Therefore, it will be necessary to replace the receiver/drier.(See RECEIVER/DRIER REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)(See RECEIVER/DRIER REMOVAL/INSTALLATION [SKYACTIV-G 2.5].)