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TROUBLE DIAGNOSIS MTC-47 C D E F G H I K L M A B MTC 2007 Pathfinder Air Mix Door Motor Circuit EJS004RO SYMPTOM: ● Discharge air temperature does not change. ● Air mix door motor does not operate. INSPECTION FLOW 1. CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE INCREASE 1. Blower must be on (1, 2, 3, 4). 2. Turn the temperature control dial clockwise to maximum heat. 3. Check for hot air at discharge air outlets. >> GO TO 2. 2. CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE DECREASE 1. Turn the temperature control dial counterclockwise to maximum cold. 2. Check for cold air at discharge air outlets. Can a symptom be duplicated? YES >> GO TO 4. NO >> GO TO 3. 3. PERFORM COMPLETE OPERATIONAL CHECK Perform a complete operational check and check for any symptoms. Refer to Can a symptom be duplicated? YES >> Refer to NO >> System OK. 4. CHECK FOR SERVICE BULLETINS Check for any service bulletins. >> GO TO 5. 5. CHECK AIR MIX DOOR OPERATION Check and verify air mix door mechanism for smooth operation from maximum cold to maximum heat in each OK or NG OK >> GO TO 6. NG >> Repair as necessary. 6. CHECK THE AIR MIX DOOR MOTOR PBR CIRCUIT Perform diagnostic procedure for the air mix door motor. Refer to ATC-63, "Air Mix Door Motor Circuit" . OK or NG OK >> GO TO 7. NG >> Repair PBR circuit or replace air mix door motor. Refer to |