NO COOL AIR FROM FRONT/REAR VENTS [CLIMATE CONTROL SYSTEM]

id0703k2901000

DESCRIPTION
•  Magnetic clutch does not operate
POSSIBLE CAUSE
•  Airflow mode system malfunction
•  Blower system malfunction
•  A/C compressor malfunction
•  CAN communication malfunction
•  PCM A/C cut control system malfunction
•  Refrigerant pressure sensor malfunction
•  Evaporator temperature sensor malfunction
•  Magnetic clutch malfunction
•  A/C 7.5 A fuse malfunction
•  A/C relay malfunction
•  Improper refrigerant charging amount
•  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
CHECK MALFUNCTION SYMPTOMS
Note
•  Without i-stop, go to the next step.
•  Is malfunctions occur in only when operating the i-stop?
Yes
Perform the i-stop troubleshooting.
(See FOREWORD [PCM (SKYACTIV-G 2.5T)].)
No
Go to the next step.
2
INSPECT AIR BLOW OUT
•  Does air blow out?
Yes
Go to the next step.
No
Go to Step 1 of the following troubleshooting.
•  INSUFFICIENT AIR (OR NO AIR) BLOWN FROM FRONT VENTS [CLIMATE CONTROL SYSTEM]
•  INSUFFICIENT AIR (OR NO AIR) BLOWN FROM REAR VENTS [CLIMATE CONTROL SYSTEM]
•  AMOUNT OF AIR BLOWN FROM FRONT VENTS DOES NOT CHANGE [CLIMATE CONTROL SYSTEM]
•  AMOUNT OF AIR BLOWN FROM REAR VENTS DOES NOT CHANGE [CLIMATE CONTROL SYSTEM]
3
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 FRONT/REAR VENTS NOT COLD ENOUGH [CLIMATE CONTROL SYSTEM]
No
Go to the next step.
4
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.
•  Are any DTCs displayed?
Yes
Go to appropriate inspection procedure.
(See DTC TABLE [PCM (SKYACTIV-G 2.5T)].)
(See DTC TABLE [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)
(See DTC TABLE [INSTRUMENT CLUSTER].)
(See DTC TABLE [FRONT BODY CONTROL MODULE (FBCM)].)
No
Go to the next step.
5
DETERMINE IF MALFUNCTION CAUSE IS A/C REQUEST SIGNAL OR A/C RELAY OPERATIONAL MALFUNCTION
•  Access PCM PID ACCS using the M-MDS.
•  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.
No
Go to Step 10.
6
DETERMINE IF MALFUNCTION CAUSE IS A/C PRESSURE SENSOR SIGNAL OR ELSEWHERE
•  Access PCM PID AC_PRES.
•  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.
No
Go to the next step.
7
INSPECT REFRIGERANT PRESSURE SENSOR
•  Inspect the refrigerant pressure sensor.
•  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 16.
No
Repair or replace malfunctioning part according to inspection result, then go to Step 16.
8
DETERMINE IF MALFUNCTION CAUSE IS EVAPORATOR TEMPERATURE SENSOR OPERATIONAL SIGNAL OR ELSEWHERE
•  Access climate control unit PID EVA_TMP_SEN.
•  Monitor the EVA_TMP_SEN PID while turning on and off the air conditioner by switching the control panel.
•  Is the PID normal?
Yes
Go to Step 10.
No
Go to the next step.
9
INSPECT EVAPORATOR TEMPERATURE SENSOR
•  Inspect the evaporator temperature sensor.
•  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 16.
No
Replace the evaporator temperature sensor, then go to Step 16.
(See EVAPORATOR TEMPERATURE SENSOR REMOVAL/INSTALLATION.)
10*
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 E and body ground under the following conditions.
?  A/C switch is off.
?  A/C switch is on.
•   Is the voltage as follows?
?  A/C off: B+
?  A/C on: below 1.0 V
Yes
Go to Step 15.
No
Go to the next step.
11
INSPECT FUSE
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
•  Remove the A/C 7.5 A fuse.
•  Is the fuse normal?
Yes
Go to the next step.
No
Replace the A/C 7.5 A fuse, then go to Step 16.
If fuse burns out immediately, go to the next step.
12
INSPECT TO SEE WHETHER MALFUNCTION IS IN A/C RELAY OR ELSEWHERE
•  Is the A/C relay normal?
Yes
Go to the next step.
No
Replace the A/C relay, then go to Step 16.
(See RELAY LOCATION.)
13*
INSPECT WIRING HARNESS BETWEEN FUSE BLOCK AND A/C RELAY FOR LACK OF CONTINUITY
•  Connect the negative battery terminal.
•  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 D (A/C control signal)
•  Are voltages B+?
Yes
Go to the next step.
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 16.
14*
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.
•  Disconnect the PCM connector.
•  Verify continuity at the following terminals between PCM and A/C relay.
?  PCM terminal 2BB (wiring harness-side)—A/C relay terminal E (relay and fuse block side)
•  Is there continuity?
Yes
Inspect the PCM, then go to Step 16.
(See PCM INSPECTION [SKYACTIV-G 2.5T].)
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 16.
15
INSPECT TO SEE WHETHER MALFUNCTION IS IN MAGNETIC CLUTCH OR ELSEWHERE
•  Inspect the magnetic clutch.
•  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.
No
Replace the magnetic clutch, then go to the next step.
(See MAGNETIC CLUTCH DISASSEMBLY/ASSEMBLY.)
16
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?)
Yes
Troubleshooting completed. Explain repairs to customer.
No
Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs.