AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System) PROBLEM SYMPTOMS TABLE
Tech Tips
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Use the table below to help determine the causes of the problem symptom. If multiple suspected areas are listed, the potential cases of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
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Inspect the fuses and relays related to this system before inspecting the suspected areas below.
| Symptom | Suspected Area | See page |
|---|---|---|
| No functions of air conditioning panel operate | LIN communication line | |
| Air conditioning control panel circuit | ||
| Air conditioning amplifier | ||
| No functions of air conditioning system operate | IG power source circuit | |
| Back-up power source circuit | ||
| Air conditioning control panel circuit | ||
| Air conditioning amplifier | ||
| Airflow Control: No blower control (Blower motor does not operate) | Blower motor circuit | |
| Air conditioning control panel circuit | ||
| Air conditioning amplifier | ||
| Airflow Control: No blower control (Blower motor does not change speed) | Blower motor circuit | |
| Air conditioning control panel circuit | ||
| Air conditioning amplifier | ||
| Temperature Control: No cool air comes out | Refrigerant volume | |
| Refrigerant pressure | ||
| Air conditioning pressure sensor circuit | ||
| Compressor solenoid circuit | ||
| Air conditioning compressor magnetic clutch circuit | ||
| Flow sensor circuit | ||
| Air mix damper control servo motor circuit | ||
| Evaporator temperature sensor circuit | ||
| Room temperature sensor circuit | ||
| Ambient temperature sensor circuit | ||
| Air conditioning control panel circuit | ||
| Expansion valve | ||
| Air conditioning amplifier | ||
| ECM (for 1KR-FE) | ||
| ECM (for 1NR-FE) | ||
| ECM (for 1ND-TV) | ||
| CAN communication system | ||
| Temperature Control: No warm air comes out | Air mix damper control servo motor circuit | |
| Air conditioning harness | ||
| Evaporator temperature sensor circuit | ||
| Room temperature sensor circuit | ||
| Ambient temperature sensor circuit | ||
| Air conditioning control panel circuit | ||
| Air conditioning amplifier | ||
| ECM (for 1KR-FE) | ||
| ECM (for 1NR-FE) | ||
| ECM (for 1ND-TV) | ||
| CAN communication system | ||
| Temperature Control: Output air is warmer or cooler than set temperature | Refrigerant volume | |
| Refrigerant pressure | ||
| Solar sensor circuit | ||
| Room temperature sensor circuit | ||
| Ambient temperature sensor circuit | ||
| Air mix damper control servo motor circuit | ||
| Air inlet damper control servo motor circuit | ||
| Air conditioning control panel circuit | ||
| Heater radiator unit | ||
| Expansion valve | ||
| Air conditioning amplifier | ||
| ECM (for 1KR-FE) | ||
| ECM (for 1NR-FE) | ||
| ECM (for 1ND-TV) | ||
| CAN communication system | ||
| Temperature Control: No temperature control (Only Max. cool or Max. warm) | Solar sensor circuit | |
| Air conditioning control panel circuit | ||
| Air conditioning amplifier | ||
| LIN communication line | ||
| Engine coolant does not warm up quickly when the engine is cold. (PTC heater does not operate)* | PTC heater circuit | |
| Air conditioning amplifier | ||
| No air inlet control | Air conditioning control panel circuit | |
| Air inlet damper control servo motor circuit | ||
| Air conditioning amplifier | ||
| No air flow mode control | Air conditioning control panel circuit | |
| Air outlet damper control servo motor circuit | ||
| Air conditioning amplifier | ||
| Engine idle up does not occur, or is continuous | Air conditioning compressor magnetic clutch circuit | |
| Compressor solenoid circuit | ||
| Air conditioning amplifier | ||
| ECM (for 1KR-FE) | ||
| ECM (for 1NR-FE) | ||
| ECM (for 1ND-TV) | ||
| CAN communication system | ||
| Blinking of air conditioning indicator | Compressor solenoid circuit | |
| Air conditioning amplifier | ||
| CAN communication system | ||
| Cooling fan motor does not operate | Cooling fan system (for 1KR-FE) | |
| Cooling fan system (for 1NR-FE) | - | |
| Cooling fan system (for 1ND-TV) | ||
| Air conditioning amplifier | ||
| Diagnostic trouble codes are not recorded. Set mode is cleared when ignition switch turned off. | Back-up power source circuit | |
| Air conditioning amplifier |
*: w/ PTC Heater