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AIR INTAKE MODE DOES NOT CHANGE [CLIMATE CONTROL SYSTEM]

DESCRIPTION

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

POSSIBLE CAUSE

  • Air intake actuator malfunction

  • Open or short circuit in wiring harness between climate control unit and air intake actuator

  • Climate control unit malfunction

  • Air intake link malfunction

  • Air intake door malfunction

  • Restriction in A/C unit

  • 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, inspect to make sure connectors, terminals and wiring harnesses are connected correctly and undamaged.

Diagnostic Procedure

Step

Inspection

Action

1

 INSPECT AIR INTAKE ACTUATOR

  • Does the air intake actuator operate?

Yes

Go to Step 7.

No

Go to the next step.

2

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

Yes

Go to the next step.

No

Go to Step 4.

3

 INSPECT AIR INTAKE ACTUATOR

Yes

Go to Step 7.

No

Replace the air intake actuator.

(See AIR INTAKE ACTUATOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)

(See AIR INTAKE ACTUATOR REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].)

Then go to Step 9.

4

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

Yes

Go to the next step.

No

Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and air intake actuator 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 for a short to power supply.

  • Repair or replace the malfunctioning part.

    If there is no common connector:

  • Repair or replace the wiring harness which has a short to power supply.

Go to Step 9.

5

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

  • Climate control unit and air intake actuator connectors disconnected.

  • Switch the ignition off.

  • Inspect for continuity at the following terminals between the air intake actuator and ground.

    • Terminal A (FRESH motor drive signal)

    • Terminal B (RECIRCULATE motor drive signal)

  • Is there continuity?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and air intake actuator 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 for a short to ground.

  • Repair or replace the malfunctioning part.

    If there is no common connector:

  • Repair or replace the wiring harness which has a short to ground.

Go to Step 9.

No

Go to the next step.

6

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

  • Climate control unit and air intake actuator connectors disconnected.

  • Inspect for continuity at the following terminals between the air intake actuator and climate control unit.

    • Terminal A—U (FRESH motor drive signal)

    • Terminal B—S(RECIRCULATE motor drive signal)

  • Is there continuity?

Yes

Replace the climate control unit, then go to Step 9.

(See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)

(See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].)

No

Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and air intake actuator 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 9.

7

 INSPECT AIR INTAKE LINK

  • Inspect the air intake link.

    (See A/C UNIT REMOVAL/INSTALLATION.)

    • Is there grease on link?

    • Are the links securely and properly installed?

    • Are the links free of obstructions and hindrances?

  • Are the above items normal?

Yes

Go to the next step.

No

Apply grease to the links. If any the links are damaged, replace the air intake actuator, then go to Step 9.

(See A/C UNIT DISASSEMBLY/ASSEMBLY.)

8

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

  • Inspect the A/C unit air intake door.

    (See A/C UNIT REMOVAL/INSTALLATION.)

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

    • Are the doors securely and properly installed?

  • Are the above items normal?

Yes

Go to the next step.

No

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

(See A/C UNIT DISASSEMBLY/ASSEMBLY.)

9

 VERIFY THAT MALFUNCTION SYMPTOMS DO NOT RECUR AFTER REPAIR

  • Does the air intake mode change smoothly?

Yes

Troubleshooting completed. Explain repairs to customer.

No

Recheck malfunction symptoms, then repeat from Step 1 if the malfunction recurs.
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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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