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NO COOL AIR [CLIMATE CONTROL SYSTEM]

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2016 – MX-5 – HVAC

NO COOL AIR [CLIMATE CONTROL SYSTEM]

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 MAG 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

INSPECT AIR BLOW OUT

  • Does air blow out?

Yes

Go to the next step.

No

Go to Step 1 of the following troubleshooting.

(See INSUFFICIENT AIR (OR NO AIR) BLOWN FROM VENTS [CLIMATE CONTROL SYSTEM].)

(See AMOUNT OF AIR BLOWN FROM VENTS DOES NOT CHANGE [CLIMATE CONTROL SYSTEM].)

2

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 VENTS NOT COLD ENOUGH [CLIMATE CONTROL SYSTEM]

No

Go to the next step.

3

INSPECT FOR DTCs IN PCM, CLIMATE CONTROL UNIT, AND INSTRUMENT CLUSTER

Yes

Go to appropriate inspection procedure.

(See DTC TABLE [PCM (SKYACTIV-G 2.0)].)

(See DTC TABLE [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)

(See DTC TABLE [CLIMATE CONTROL UNIT (MANUAL AIR CONDITIONER)].)

(See DTC TABLE [INSTRUMENT CLUSTER].)

No

Go to the next step.

4

DETERMINE IF MALFUNCTION CAUSE IS A/C REQUEST SIGNAL OR A/C RELAY OPERATIONAL MALFUNCTION

Yes

Go to the next step.

No

Go to Step 9.

5

DETERMINE IF MALFUNCTION CAUSE IS REFRIGERANT PRESSURE SENSOR SIGNAL OR ELSEWHERE

Yes

Go to Step 7.

No

Go to the next step.

6

INSPECT REFRIGERANT PRESSURE SENSOR

Yes

Inspect the following and repair or replace if necessary.

  • Refrigerant charging amount

  • A/C compressor for seizure

Then go to Step 15.

No

Repair or replace malfunctioning part according to inspection result, then go to Step 15.

7

DETERMINE IF MALFUNCTION CAUSE IS EVAPORATOR TEMPERATURE SENSOR OPERATIONAL SIGNAL OR ELSEWHERE

Yes

Go to Step 9.

No

Go to the next step.

8

INSPECT EVAPORATOR TEMPERATURE SENSOR

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 15.

No

Replace the evaporator temperature sensor, then go to Step 16.

(See A/C UNIT DISASSEMBLY/ASSEMBLY.)

9*

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 11.

10*

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 voltage approx. 12 V?

Yes

Inspect the PCM, then go to Step 15.

(See PCM INSPECTION [SKYACTIV-G 2.0].)

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 14.

11

INSPECT TO SEE WHETHER MALFUNCTION IS IN MAGNETIC CLUTCH OR ELSEWHERE

Yes

Go to the next step.

No

Replace the magnetic clutch, then go to Step 15.

(See MAGNETIC CLUTCH DISASSEMBLY/ASSEMBLY.)

12

INSPECT FUSE

  • Remove the A/C MAG 7.5 A fuse.

  • Is the fuse normal?

Yes

Go to the next step.

No

Replace the A/C MAG 7.5 A fuse, then go to Step 16.

If fuse burns out immediately, go to the next step.

13

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)

  • 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 15.

14

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 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.

(See RELAY LOCATION.)

15

VERIFY THAT MALFUNCTION SYMPTOMS DO NOT RECUR AFTER REPAIR

Yes

Troubleshooting completed. Explain repairs to customer.

No

Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs.

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