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.

AIR INTAKE MODE DOES NOT CHANGE (AUTO A/C) DIAGNOSTIC PROCEDURE

Step	Inspection		Action
1	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)] .)
1		No	Go to the next step.
2	INSPECT AIR INTAKE LINK Inspect air intake links. (See BLOWER UNIT DISASSEMBLY/ASSEMBLY [(US)] .) Is grease on link? Are links securely and properly installed? Are links free of obstructions and hindrances? Are the above items normal?	Yes	Go to the next step.
2		No	Apply grease to links. If any links are damaged, replace malfunctioning part. Then perform the repair completion verification.
3	INSPECT AIR INTAKE ACTUATOR Inspect the air intake actuator. (See AIR INTAKE ACTUATOR INSPECTION (AUTO A/C) .) Is it normal?	Yes	Inspect the air intake doors, then perform the repair completion verification. (See BLOWER UNIT DISASSEMBLY/ASSEMBLY [(US)] .) If any doors are cracked or damaged, replace them. If any doors are not installed securely and properly. Install them in proper positions. If there are any obstructions, remove them.
3		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 air intake mode change smoothly?	Yes	Troubleshooting completed. Explain repairs to customer.
Repair completion verification		No	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.