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TROUBLE DIAGNOSIS ATC-63 C D E F G H I K L M A B ATC CHECKING INTAKE AIR (INTAKE SWITCH) 1. Press intake switch one time. 2. Press intake switch again. Recirculation indicator should illuminate. 3. Listen for intake door position change. (Slight change of blower sound can be heard.) If NG, go to trouble diagnosis procedure for ATC-76, "Intake Door Motor Circuit" . If OK, continue the check. CHECKING TEMPERATURE DECREASE 1. Turn temperature dial (driver side) until 18 ° C (60 ° F) is displayed. 2. Check for cold air at discharge air outlets. If NG, go to trouble diagnosis procedure for ATC-93, "Insufficient Cooling" . If OK, continue the check. CHECKING TEMPERATURE INCREASE 1. Turn temperature dial (driver side) until 32 ° C (90 ° F) is displayed. 2. Check for hot air at discharge air outlets. If NG, go to trouble diagnosis procedure for ATC-102, "Insufficient Heating" If OK, continue the check. CHECK ECON (ECONOMY) MODE 1. Set temperature dial 25 ° C (75 ° F). 2. Press ECON switch. 3. Display should indicate ECON (not AUTO). 4. Press ECON switch again. Display should disappear ECON. ● Confirm that the compressor clutch is not engaged (sound or visual inspection). (Discharge air and If NG, go to trouble diagnosis procedure for ATC-106, "ECON (ECONOMY) MODE" . If OK, continue the check. CHECKING AUTO MODE 1. Press AUTO switch. 2. Display should indicate AUTO (not ECON). ● Confirm that the compressor clutch engages (sound or visual inspection). (Discharge air and blower If NG, go to trouble diagnosis procedure for ATC-64, "Power Supply and Ground Circuit for Auto Amp." , then if necessary, trouble diagnosis procedure for ATC-86, "Magnet Clutch Circuit" If all operational checks are OK (symptom cannot be duplicated), go to Incident Simulation Tests in "How to Perform Efficient Diagnosis for an Electrical Incident" and perform tests as outlined to simulate driv- ing conditions environment. If symptom appears, refer to and perform applica- ble trouble diagnosis procedures. |