NO.7 NO COOL AIR [MANUAL AIR CONDITIONER]

id0702c2812600

7
No cool air
Description
•  Magnetic clutch does not operate.
Possible cause
•  Malfunction in PCM A/C cut control system
•  Malfunction in climate control unit
•  Malfunction in refrigerant pressure sensor
•  Malfunction in PCM (A/C signal)
•  Malfunction in PCM (IG1 signal)
•  Malfunction in A/C compressor
•  Malfunction in A/C relay
•  Malfunction in evaporator temperature sensor
•  Malfunction in front body control module (FBCM)
•  Malfunction in instrument cluster
•  Malfunction in CAN communication
•  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
INSPECT AIR BLOW OUT
•  Does air blow out?
Yes
Go to the next step.
No
Go to Step 1 of troubleshooting indexes No.1 and 2.
2
INSPECT A/C COMPRESSOR OPERATION
•  Start engine.
•  Turn A/C switch and airflow volume control switch on.
•  Does A/C compressor operate?
Yes
Go to Step 1 of troubleshooting index No.6.
No
Go to the next step.
3
INSPECT FOR DTC IN PCM, CLIMATE CONTROL UNIT, AND INSTRUMENT CLUSTER
•  Inspect for DTCs related to the PCM, climate control unit, and instrument cluster on-board diagnostic system.
•  Are any DTCs displayed?
Yes
Go to appropriate inspection procedure.
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.
•  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.
5
DETERMINE IF MALFUNCTION CAUSE IS A/C PRESSURE SENSOR SIGNAL OR ELSEWHERE
•  Access climate control unit 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 7.
No
Go to the next step.
6
INSPECT TO SEE MALFUNCTION IS IN REFRIGERANT PRESSURE SENSOR OR A/C SYSTEM
•  Inspect the refrigerant pressure sensor.
•  Is the refrigerant pressure sensor normal?
Yes
Inspect for 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.
7
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 9.
No
Go to the next step.
8
INSPECT EVAPORATOR TEMPERATURE SENSOR
•  Inspect the evaporator temperature sensor.
•  Is the evaporator temperature sensor normal?
Yes
Inspect and repair for open or short circuit between evaporator temperature sensor and climate control unit.
Then go to Step 16.
No
Replace the evaporator temperature sensor, then go to Step 16.
(See A/C UNIT DISASSEMBLY/ASSEMBLY.)
9
DETERMINE IF MALFUNCTION CAUSE IS INSTRUMENT CLUSTER OR CAN COMMUNICATION SIGNAL
•  Verify the information panel indication of A/C system while turning on and off the air conditioner by switching the control panel.
•  Does the information panel indicate properly?
Yes
Replace the instrument cluster.(Instrument cluster does not receive A/C request signal from climate control unit or transmit it to PCM.)
(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
Then go to Step 16.
No
Repair or replace malfunctioning part according to inspection result, then go to Step 16.
10
INSPECT TO SEE WHETHER MALFUNCTION (LACK OF CONTINUITY) IS IN A/C CONTROL SIGNAL CIRCUIT (BETWEEN A/C RELAY AND PCM) OR ELSEWHERE
•  Does cool air blow out when terminal E of A/C relay connector (A/C control signal) is grounded?
Yes
Release short, then go to the next step.
No
Go to Step 12.
11
INSPECT TO SEE WHETHER MALFUNCTION (LACK OF CONTINUITY) IS IN PCM OR WIRING HARNESS (BETWEEN A/C RELAY AND PCM)
•  Test voltage at the A/C relay control signal terminal of PCM.
•  Is the voltage approx. 12 V?
Yes
Inspect the PCM, then go to Step 16.
No
Repair wiring harness between A/C relay and PCM, then go to Step 16.
12*
INSPECT TO SEE WHETHER MALFUNCTION IS IN MAGNETIC CLUTCH OR ELSEWHERE
•  Test voltage at the following terminal of magnetic clutch.
―  Terminal A (magnetic clutch operation signal)
•  Is the voltage approx. 12 V?
Yes
Inspect magnetic clutch, then go to Step 16.
No
Go to the next step.
13*
INSPECT FUSE
•  Are A/C relay power supply fuses okay?
Yes
Go to the next step.
No
Replace fuse, then go to Step 16. If fuse burns out immediately, go to the next step.
14
INSPECT WIRING HARNESS BETWEEN FUSE BLOCK AND A/C RELAY FOR LACK OF CONTINUITY
•  Test voltages at following terminals of A/C relay.
―  Terminal A (A/C relay control signal)
―  Terminal C (A/C control signal)
•  Is the voltage approx. 12 V?
Yes
Go to the next step.
No
Repair wiring harness between fuse block and A/C relay, then go to Step 16.
15
INSPECT TO SEE WHETHER MALFUNCTION IS IN A/C RELAY OR WIRING HARNESS (BETWEEN A/C RELAY AND MAGNETIC CLUTCH)
•  Test voltage at the following terminal of A/C relay.
―  Terminal D (magnetic clutch operation signal)
•  Is the voltage approx. 12 V?
Yes
Inspect wiring harness between A/C relay and magnetic clutch.
•  If above wiring harness is OK, go to the next step.
•  If above wiring harness malfunctions, repair wiring harness, then go to the next step.
No
Replace the A/C relay, then go to the next step.
16
CONFIRM THAT MALFUNCTION SYMPTOMS DO NOT RECUR AFTER REPAIR
•  Does cool air blow out? (Are the results of refrigerant system performance test okay?)
Yes
Troubleshooting completed. Explain repairs to customer.
No
Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs.