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.

NO TEMPERATURE CONTROL WITH CLIMATE CONTROL UNIT (AUTO A/C) DIAGNOSTIC PROCEDURE

Step	Inspection		Action
1	INSPECT COOLANT TEMPERATURE Is the coolant sufficiently warmed up?	Yes	Go to the next step.
1		No	Warm up the engine, then perform the repair completion verification.
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)] .)
2		No	Go to the next step.
3	INSPECT AIR MIX LINK PART Inspect the air mix actuator and air mix link. 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.
3		No	Apply grease or securely install to the correct positions. If there is a malfunction in the air mix link, replace the air mix link. (See A/C UNIT DISASSEMBLY/ASSEMBLY [(US)] .) Then perform the repair completion verification.
4	INSPECT AIR MIX ACTUATOR Inspect the air mix actuator. (See AIR MIX ACTUATOR INSPECTION (AUTO A/C) .) Is it normal?	Yes	Inspect the air mix 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 mix door to the correct position. If the air mix door is cracked or damaged, replace the air mix door. (See A/C UNIT DISASSEMBLY/ASSEMBLY [(US)] .) Then perform the repair completion verification.
4		No	Replace the air mix actuator, then perform the repair completion verification. (See AIR MIX ACTUATOR REMOVAL (AUTO A/C) (US) .) (See AIR MIX ACTUATOR INSTALLATION (AUTO A/C) (US) .)
Repair completion verification	VERIFY THAT MALFUNCTION SYMPTOM DOES NOT RECUR AFTER REPAIR Does the temperature change when the temperature control dial is operated?	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.