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2008 - MX-5 - HVAC

NO.3 AIR INTAKE MODE DOES NOT CHANGE



3

Air intake mode does not change.

DESCRIPTION

  • Air intake mode does not change when switching REC/FRESH mode.

POSSIBLE CAUSE

  • Malfunction in air intake actuator

  • Malfunction in air intake door


Diagnostic procedure

STEP

INSPECTION

ACTION

1*

INSPECT TO SEE WHETHER MALFUNCTION (LACK OF CONTINUITY) IS IN AIR INTAKE ACTUATOR, WIRING HARNESS (BETWEEN CLIMATE CONTROL UNIT AND AIR INTAKE ACTUATOR) OR ELSEWHERE

  • Turn ignition switch to ON position.

  • Test voltages at the following terminals of climate control unit.

  • Are voltages okay?

Yes

Go to the next step.

No

Go to Step 3.

2*

INSPECT TO SEE WHETHER MALFUNCTION (LACK OF CONTINUITY) IS IN AIR INTAKE ACTUATOR OR WIRING HARNESS (BETWEEN CLIMATE CONTROL UNIT AND AIR INTAKE ACTUATOR)

  • Test voltages at the following terminals of air intake actuator.

    • Terminal A

    • Terminal I

  • Are voltages as shown below?

    • Terminal A: approx. 0.5 V during RECIRCULATE and approx. 10 V during FRESH

    • Terminal I: approx. 10 V during RECIRCULATE and approx. 0.5 V during FRESH

Yes

Replace air intake actuator, then go to Step 8. (See AIR INTAKE ACTUATOR REMOVAL/INSTALLATION.)

No

Repair wiring harness between climate control unit and air intake actuator, then go to Step 8.

3

INSPECT TO SEE WHETHER MALFUNCTION IS IN AIR INTAKE ACTUATOR OR ELSEWHERE

  • Disconnect air intake actuator connector.

  • Test voltages at the following terminals of climate control unit.

  • Are voltages okay?

Yes

Inspect air intake actuator, then go to Step 8.

No

Go to the next step.

4

INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (SHORT TO B+ BETWEEN CLIMATE CONTROL UNIT AND AIR INTAKE ACTUATOR) OR ELSEWHERE

  • Disconnect climate control unit connector.

  • Test voltages at the following terminals of climate control unit.

    • Terminal G (20-pin, ACTR POWER)

    • Terminal I (20-pin, ACTR SIGNAL)

  • Are voltages approx. 0 V?

Yes

Go to the next step.

No

Repair wiring harness between climate control unit and air intake actuator, then go to Step 8.

5

INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (SHORT TO GROUND BETWEEN CLIMATE CONTROL UNIT AND AIR INTAKE ACTUATOR) OR ELSEWHERE

  • Turn ignition switch to LOCK position.

  • Inspect for continuity at the following terminals between climate control unit and ground.

    • Terminal G (20-pin, ACTR POWER)

    • Terminal I (20-pin, ACTR SIGNAL)

  • Is there continuity?

Yes

Repair wiring harness between climate control unit and air intake actuator, then go to Step 8.

No

Go to the next step.

6

INSPECT AIR INTAKE LINK

  • Inspect air intake links.

    • Is there grease on link?

    • Are links securely and properly installed?

    • Are links free of obstructions and hindrances?

  • Are above items okay?

Yes

Go to the next step.

No

Apply grease to links. If any links are damaged, replace air intake actuator, then go to Step 8.

7

INSPECT TO SEE WHETHER MALFUNCTION IS IN CLIMATE CONTROL UNIT OR AIR INTAKE DOOR

  • Inspect blower unit air intake door.

    • Is door free of obstructions, cracks, and damage?

    • Are doors securely and properly installed?

  • Are above items okay?

Yes

Replace climate control unit, then go to the next step. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION.)

No

Remove obstruction, or install doors in proper position. If any doors are cracked or damaged, replace them, then go to the next step.

8

CONFIRM THAT MALFUNCTION SYMPTOMS DO NOT RECUR AFTER REPAIR

  • Does air intake mode change smoothly?

Yes

Troubleshooting completed. Explain repairs to customer.

No

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




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