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Diagnostic Procedure

WARNING: This page is about a different car, the 2020 Mazda CX-30. However, it is still accessible from the selected car via links, so may be relevant.
WINDSHIELD FOGGED (AUTO A/C) DIAGNOSTIC PROCEDURE

Step Inspection Action
1 VERIFY THAT THERE IS COOL AIRFLOW
  • Switch the A/C switch ON.
  • Set the airflow volume control dial to 1 or more.
  • Is there cool airflow from the vent?
 Yes Go to the next step.
No Go to the following malfunction symptom item.
(See NO COOL AIR (AUTO A/C) (US) .)
2 PERFORM DASH-ELECTRICAL SUPPLY UNIT DTC INSPECTION
  • Perform the dash-electrical supply unit DTC inspection using the M-MDS. (See DTC INSPECTION .)
  • Are any DTCs displayed?
 Yes Go to the applicable DTC inspection.
(See DTC TABLE [DASH-ELECTRICAL SUPPLY UNIT (US)] .)
No Go to the next step.
3 INSPECT AIR INTAKE LINK PART
  • Inspect the air intake actuator, air intake link for the following items.
    • Is grease on link?
    • Are links securely and properly installed?
    • Are links free of obstructions and hindrances?
  • Are the above items normal?
 Yes Inspect the air intake door for the following items.
  • Verify if there is no abnormal noise, cracks, or damage.
  • Are doors securely and properly installed?

If there is foreign matter, remove it or securely install the air intake door to the correct position.
If the air intake door is cracked or damaged, replace the air intake door.
(See BLOWER UNIT DISASSEMBLY/ASSEMBLY [(US)] .)
Then perform the repair completion verification.
No Apply grease or securely install to the correct positions.
If there is a malfunction in the air intake link, replace the air intake link.
(See BLOWER UNIT DISASSEMBLY/ASSEMBLY [(US)] .)
Then perform the repair completion verification.
4 INSPECT AIR INTAKE ACTUATOR
 Yes Inspect the air intake door for the following items.
  • Verify if there is no abnormal noise, cracks, or damage.
  • Are doors securely and properly installed?

If there is foreign matter, remove it or securely install the air intake door to the correct position.
If the air intake door is cracked or damaged, replace the air intake door.
(See BLOWER UNIT DISASSEMBLY/ASSEMBLY [(US)] .)
Then perform the repair completion verification.
No Replace the air intake actuator, then perform the repair completion verification.
(See AIR INTAKE ACTUATOR REMOVAL/INSTALLATION (AUTO A/C) (US) .)
Repair completion verification VERIFY THAT MALFUNCTION SYMPTOM DOES NOT RECUR AFTER REPAIR
  • Does the malfunction symptom recur?
 Yes Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.
(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(US)] .)
If the CAN communication is normal, perform the diagnosis from Step 1.
No Troubleshooting completed.
Explain repairs to customer.
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