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

STEP

INSPECTION

ACTION

1

• Does air blow out?

Yes

Go to the next step.

No

Go to Step 1 of troubleshooting indexes No.1 and 2.

2

• Start engine.

• Turn A/C switch and fan 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 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

• 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

• 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?

  (See PID/DATA MONITOR DISPLAY [FULL-AUTO AIR CONDITIONER].)

Yes

Go to Step 7.

No

Go to the next step.

6

• Inspect the refrigerant pressure sensor.

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

• 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.

7

• 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?

  (See PID/DATA MONITOR DISPLAY [FULL-AUTO AIR CONDITIONER].)

Yes

Go to Step 9.

No

Go to the next step.

8

• Inspect the evaporator temperature sensor.

  (See EVAPORATOR TEMPERATURE SENSOR INSPECTION [FULL-AUTO AIR CONDITIONER].)

• 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

• 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

• 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*

• Test voltage at the A/C relay control signal terminal of PCM.

• Is voltage approx. 12 V?

Yes

Inspect the PCM, then go to Step 16.

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.

12*

• Test voltage at the following terminal of magnetic clutch thermal protector.

• Terminal A (magnetic clutch operation signal)

• Is voltage approx. 12 V?

Yes

Inspect magnetic clutch, then go to Step 16.

No

Go to the next step.

13

• Are A/C relay power supply fuses normal?

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

• Test voltages at following terminals of A/C relay.

• Terminal A (A/C relay control signal)

• Terminal C (A/C control signal)

• Are voltages approx. 12 V?

Yes

Go to the next step.

No

Refer to the wiring diagram and verify whether or not there is a common connector between fuse block terminal and A/C relay 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

• Test voltage at the following terminal of A/C relay.

• Terminal D (magnetic clutch operation signal)

• Is voltage approx. 12 V?

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 A/C relay, then go to the next step.

16

• 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.