NO COOL AIR [FULL-AUTO AIR CONDITIONER (E)]

Troubleshooting item	No cool air
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. • A/C request signal is not input to PCM ― Communication error between dash electrical supply unit and body control module (BCM) ― Communication error between body control module (BCM) 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 dash-electrical supply unit • Open circuit in A/C relay signal circuit • Short to power supply in A/C relay signal circuit • Open circuit in magnetic clutch power supply circuit • Short to ground in magnetic clutch power supply circuit • Open circuit in A/C relay power supply circuit • Short to ground in A/C relay power supply circuit • Open circuit in magnetic clutch signal circuit • Short to ground in magnetic clutch signal circuit • 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	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.
No	Go to Step 1 of the following troubleshooting. (See INSUFFICIENT AIR (OR NO AIR) BLOWN FROM VENTS [FULL-AUTO AIR CONDITIONER].) (See AMOUNT OF AIR BLOWN FROM VENTS DOES NOT CHANGE [FULL-AUTO AIR CONDITIONER (E)].)
2	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 AIR FROM VENTS NOT COLD ENOUGH [FULL-AUTO AIR CONDITIONER].)
No	Go to the next step.
3	VERIFY DTCs FOR RELATED MODULES • Verify DTCs using the M-MDS. ― PCM (See DTC INSPECTION.) ― Dash-electrical supply unit (See DTC INSPECTION.) ― Body control module (BCM) (See DTC INSPECTION.) • Are any DTCs displayed?	Yes	Go to the applicable DTC inspection. ― PCM (See DTC TABLE [PCM (SKYACTIV-G (E))].) (See DTC TABLE [PCM (SKYACTIV-D)].) (See DTC TABLE [PCM (SKYACTIV-X)].) ― Dash-electrical supply unit (See DTC TABLE [DASH-ELECTRICAL SUPPLY UNIT (E)].) ― Body control module (BCM) (See DTC TABLE [BODY CONTROL MODULE (BCM) (E)].)
No	Go to the next step.
4	VERIFY MAGNETIC CLUTCH OPERATION • Access PCM PID A/C_SW using the M-MDS. (See PID/DATA MONITOR INSPECTION.) • Start engine. • Turn the PID A/C_SW to ON from OFF using the M-MDS simulation function. (See SIMULATION INSPECTION.) • Is the magnetic clutch engaged/disengaged according to the simulation function operation?	Yes	Go to the next step.
No	Go to Step 9.
5	VERIFY MEASURED VALUE OF A/C PRESSURE SENSOR • Access PCM PIDs AC_PRES_AFT_COMP and AC_PRES_BEF_EXP_VLV using the M-MDS. (See PID/DATA MONITOR INSPECTION.) • Monitor the AC_PRES_AFT_COMP and AC_PRES_BEF_EXP_VLV while turning on and off the air conditioner by switching the control panel. • Are PIDs normal?	Yes	Go to Step 7.
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 (E)].) • 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].) (See RECEIVER/DRIER REMOVAL/INSTALLATION [SKYACTIV-D 1.8].) (See RECEIVER/DRIER REMOVAL/INSTALLATION [SKYACTIV-X 2.0].) • A/C compressor (See A/C COMPRESSOR REMOVAL/INSTALLATION [SKYACTIV-G].) (See A/C COMPRESSOR REMOVAL/INSTALLATION [SKYACTIV-D 1.8].) (See A/C COMPRESSOR REMOVAL/INSTALLATION [SKYACTIV-X 2.0].) Perform the repair completion verification.
No	Replace refrigerant pressure sensor, then perform the repair completion verification. (See REFRIGERANT PRESSURE SENSOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER (E)].)
7	VERIFY MEASURED VALUE OF EVAPORATOR TEMPERATURE SENSOR • Access dash-electrical supply unit PID EVA_TMP using the M-MDS. (See PID/DATA MONITOR INSPECTION.) • Turn the climate control unit A/C switch on and off while the PID EVA_TMP is displayed. • Is the PID normal?	Yes	Perform the repair completion verification.
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. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness. Perform the repair completion verification.
No	Replace the evaporator temperature sensor, then perform the repair completion verification. (See EVAPORATOR TEMPERATURE SENSOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER (E)].)
9	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.
No	Go to Step 13.
10*	INSPECT A/C RELAY CONTROL CIRCUIT FOR OPEN CIRCUIT • Inspect the applicable circuit for open circuit. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification.
11	INSPECT A/C RELAY CONTROL CIRCUIT FOR SHORT TO GROUND • Inspect the applicable circuit for a short to ground. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification.
12	INSPECT MAGNETIC CLUTCH • Inspect the magnetic clutch. (See MAGNETIC CLUTCH INSPECTION [SKYACTIV-G].) (See MAGNETIC CLUTCH INSPECTION [SKYACTIV-D 1.8].) (See MAGNETIC CLUTCH INSPECTION [SKYACTIV-X 2.0].) • Is the magnetic clutch normal?	Yes	Go to the next step.
No	Replace the magnetic clutch, then perform the repair completion verification. (See MAGNETIC CLUTCH DISASSEMBLY/ASSEMBLY [SKYACTIV-G].) (See MAGNETIC CLUTCH DISASSEMBLY/ASSEMBLY [SKYACTIV-D 1.8].) (See MAGNETIC CLUTCH DISASSEMBLY/ASSEMBLY [SKYACTIV-X 2.0].)
13*	INSPECT MAGNETIC CLUTCH POWER SUPPLY CIRCUIT FOR SHORT TO GROUND AND OPEN CIRCUIT • Inspect the power supply circuit for an open circuit and short to ground. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification.
14*	INSPECT A/C RELAY POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT • Inspect the power supply circuit for an open circuit. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification.
15*	INSPECT A/C RELAY POWER SUPPLY CIRCUIT FOR SHORT TO GROUND • Inspect the applicable circuit for a short to ground. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification.
16*	INSPECT MAGNETIC CLUTCH CONTROL CIRCUIT FOR OPEN CIRCUIT • Inspect the applicable circuit for open circuit. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification.
17*	INSPECT MAGNETIC CLUTCH CONTROL CIRCUIT FOR SHORT TO GROUND • Inspect the applicable circuit for a short to ground. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Replace the A/C relay and perform the repair completion verification. (See RELAY LOCATION [(E)].)
No	Repair or replace the malfunctioning location and perform the repair completion verification.
Repair completion verification	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 [(E)].)	Yes	Troubleshooting completed. Explain repairs to customer.
No	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].) If the CAN communication is normal, perform the diagnosis from Step 1.

Step

Inspection

Action

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.

Go to Step 1 of the following troubleshooting.

(See INSUFFICIENT AIR (OR NO AIR) BLOWN FROM VENTS [FULL-AUTO AIR CONDITIONER].)

(See AMOUNT OF AIR BLOWN FROM VENTS DOES NOT CHANGE [FULL-AUTO AIR CONDITIONER (E)].)

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 AIR FROM VENTS NOT COLD ENOUGH [FULL-AUTO AIR CONDITIONER].)

Go to the next step.

VERIFY DTCs FOR RELATED MODULES

• Verify DTCs using the M-MDS.

― PCM

(See DTC INSPECTION.)

― Dash-electrical supply unit

(See DTC INSPECTION.)

― Body control module (BCM)

(See DTC INSPECTION.)

• Are any DTCs displayed?

Yes

Go to the applicable DTC inspection.

― PCM

(See DTC TABLE [PCM (SKYACTIV-G (E))].)

(See DTC TABLE [PCM (SKYACTIV-D)].)

(See DTC TABLE [PCM (SKYACTIV-X)].)

― Dash-electrical supply unit

(See DTC TABLE [DASH-ELECTRICAL SUPPLY UNIT (E)].)

― Body control module (BCM)

(See DTC TABLE [BODY CONTROL MODULE (BCM) (E)].)

Go to the next step.

VERIFY MAGNETIC CLUTCH OPERATION

• Access PCM PID A/C_SW using the M-MDS.

(See PID/DATA MONITOR INSPECTION.)

• Start engine.

• Turn the PID A/C_SW to ON from OFF using the M-MDS simulation function.

(See SIMULATION INSPECTION.)

• Is the magnetic clutch engaged/disengaged according to the simulation function operation?

Yes

Go to the next step.

Go to Step 9.

VERIFY MEASURED VALUE OF A/C PRESSURE SENSOR

• Access PCM PIDs AC_PRES_AFT_COMP and AC_PRES_BEF_EXP_VLV using the M-MDS.

(See PID/DATA MONITOR INSPECTION.)

• Monitor the AC_PRES_AFT_COMP and AC_PRES_BEF_EXP_VLV while turning on and off the air conditioner by switching the control panel.

• Are PIDs normal?

Yes

Go to Step 7.

Go to the next step.

INSPECT REFRIGERANT PRESSURE SENSOR

• Inspect the refrigerant pressure sensor.

(See REFRIGERANT PRESSURE SENSOR INSPECTION [FULL-AUTO AIR CONDITIONER (E)].)

• 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].)

(See RECEIVER/DRIER REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

(See RECEIVER/DRIER REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)

• A/C compressor

(See A/C COMPRESSOR REMOVAL/INSTALLATION [SKYACTIV-G].)

(See A/C COMPRESSOR REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

(See A/C COMPRESSOR REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)

Perform the repair completion verification.

Replace refrigerant pressure sensor, then perform the repair completion verification.

(See REFRIGERANT PRESSURE SENSOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER (E)].)

VERIFY MEASURED VALUE OF EVAPORATOR TEMPERATURE SENSOR

• Access dash-electrical supply unit PID EVA_TMP using the M-MDS.

(See PID/DATA MONITOR INSPECTION.)

• Turn the climate control unit A/C switch on and off while the PID EVA_TMP is displayed.

• Is the PID normal?

Yes

Perform the repair completion verification.

Go to the next step.

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.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness.

Perform the repair completion verification.

Replace the evaporator temperature sensor, then perform the repair completion verification.

(See EVAPORATOR TEMPERATURE SENSOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER (E)].)

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.

Go to Step 13.

10*

INSPECT A/C RELAY CONTROL CIRCUIT FOR OPEN CIRCUIT

• Inspect the applicable circuit for open circuit.

(See CIRCUIT INSPECTION.)

• Is the circuit normal?

Yes

Go to the next step.

Repair or replace the malfunctioning location and perform the repair completion verification.

INSPECT A/C RELAY CONTROL CIRCUIT FOR SHORT TO GROUND

• Inspect the applicable circuit for a short to ground.

(See CIRCUIT INSPECTION.)

• Is the circuit normal?

Yes

Go to the next step.

Repair or replace the malfunctioning location and perform the repair completion verification.

INSPECT MAGNETIC CLUTCH

• Inspect the magnetic clutch.

(See MAGNETIC CLUTCH INSPECTION [SKYACTIV-G].)

(See MAGNETIC CLUTCH INSPECTION [SKYACTIV-D 1.8].)

(See MAGNETIC CLUTCH INSPECTION [SKYACTIV-X 2.0].)

• Is the magnetic clutch normal?

Yes

Go to the next step.

Replace the magnetic clutch, then perform the repair completion verification.

(See MAGNETIC CLUTCH DISASSEMBLY/ASSEMBLY [SKYACTIV-G].)

(See MAGNETIC CLUTCH DISASSEMBLY/ASSEMBLY [SKYACTIV-D 1.8].)

(See MAGNETIC CLUTCH DISASSEMBLY/ASSEMBLY [SKYACTIV-X 2.0].)

13*

INSPECT MAGNETIC CLUTCH POWER SUPPLY CIRCUIT FOR SHORT TO GROUND AND OPEN CIRCUIT

• Inspect the power supply circuit for an open circuit and short to ground.

(See CIRCUIT INSPECTION.)

• Is the circuit normal?

Yes

Go to the next step.

Repair or replace the malfunctioning location and perform the repair completion verification.

14*

INSPECT A/C RELAY POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT

• Inspect the power supply circuit for an open circuit.

(See CIRCUIT INSPECTION.)

• Is the circuit normal?

Yes

Go to the next step.

Repair or replace the malfunctioning location and perform the repair completion verification.

15*

INSPECT A/C RELAY POWER SUPPLY CIRCUIT FOR SHORT TO GROUND

• Inspect the applicable circuit for a short to ground.

(See CIRCUIT INSPECTION.)

• Is the circuit normal?

Yes

Go to the next step.

Repair or replace the malfunctioning location and perform the repair completion verification.

16*

INSPECT MAGNETIC CLUTCH CONTROL CIRCUIT FOR OPEN CIRCUIT

• Inspect the applicable circuit for open circuit.

(See CIRCUIT INSPECTION.)

• Is the circuit normal?

Yes

Go to the next step.

Repair or replace the malfunctioning location and perform the repair completion verification.

17*

INSPECT MAGNETIC CLUTCH CONTROL CIRCUIT FOR SHORT TO GROUND

• Inspect the applicable circuit for a short to ground.

(See CIRCUIT INSPECTION.)

• Is the circuit normal?

Yes

Replace the A/C relay and perform the repair completion verification.

(See RELAY LOCATION [(E)].)

Repair or replace the malfunctioning location and perform the repair completion verification.

Repair completion verification

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 [(E)].)

Yes

Troubleshooting completed. Explain repairs to customer.

Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].)

If the CAN communication is normal, perform the diagnosis from Step 1.

*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-G] .) (See RECEIVER/DRIER REMOVAL/INSTALLATION [SKYACTIV-D 1.8].) (See RECEIVER/DRIER REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)

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