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

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

SM2566242

id0703c17009c3

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.

Diagnostic Procedure

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.
• 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 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 (US))].)
― Dash-electrical supply unit (See DTC TABLE [DASH-ELECTRICAL SUPPLY UNIT (US)].)
― Body control module (BCM) (See DTC TABLE [BODY CONTROL MODULE (BCM) (US)].)
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 (US)].)
• 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 2.0, SKYACTIV-G 2.5].)
• A/C compressor (See A/C COMPRESSOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
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 (US)].)
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 (US)].)
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 2.0, SKYACTIV-G 2.5].)
• 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 2.0, SKYACTIV-G 2.5].)
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 [(US)].)
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 [(US)].)
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 [(US)].)
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 2.0, SKYACTIV-G 2.5].)