AIR CONDITIONING SYSTEM PROBLEM SYMPTOMS TABLE
Tech Tips
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Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes 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 |
|---|---|---|
| All functions of the A/C system do not operate | IG power source circuit | |
| Back-up power source circuit | ||
| LIN communication circuit | ||
| Air conditioning amplifier assembly | ||
| System does not respond to operation of switches on the air conditioning panel (heater control switch board). | Check the cooler control switch assembly. (Check to see if the temperature adjustment switch is stuck on.)*3 | - |
| Check the cooler control switch assembly temperature display. (Check to see if the display change when the temperature adjustment switch is operated.)*3 | - | |
| LIN communication circuit | ||
| Air conditioning amplifier assembly | ||
| Air flow control: No blower operation | Blower motor circuit | |
| LIN communication circuit | ||
| Air conditioning amplifier assembly | ||
| Air flow control: No blower control | Blower motor circuit | |
| LIN communication circuit | ||
| Air conditioning amplifier assembly | ||
| Air flow control: Insufficient air flow | Blower motor circuit | |
| Air conditioning amplifier assembly | ||
| Temperature control: Cooling effectiveness is poor | Refrigerant shortage check using the intelligent tester | |
| Cooling performance | ||
| Refrigerant volume | ||
| Refrigerant pressure | ||
| Cooler compressor assembly*1 | ||
| Compressor assembly with pulley*2 | ||
| Compressor assembly with pulley*5 | ||
| Air conditioning amplifier assembly | ||
| Temperature control: No cool air comes out | Refrigerant shortage check using the intelligent tester | |
| Refrigerant volume | ||
| Refrigerant pressure | ||
| Air conditioning pressure sensor circuit | ||
| Air conditioning compressor magnetic clutch circuit*1 | ||
| Compressor lock sensor circuit*1 | ||
| Compressor solenoid circuit | ||
| A/C flow sensor circuit | ||
| Air mix damper control servo motor circuit (for driver side) | ||
| Air mix damper control servo motor circuit (for front passenger side) | ||
| Evaporator temperature sensor circuit | ||
| Room temperature sensor circuit | ||
| Ambient temperature sensor circuit | ||
| LIN communication circuit | ||
| Cooler expansion valve | ||
| Engine room junction block assembly*1 | ||
| Air conditioning amplifier assembly | ||
| ECM*1 | ||
| ECM*2 | ||
| ECM*5 | ||
| Temperature control: No warm air comes out | Air mix damper control servo motor circuit (for driver side) | |
| Air mix damper control servo motor circuit (for front passenger side) | ||
| Evaporator temperature sensor circuit | ||
| Room temperature sensor circuit | ||
| Ambient temperature sensor circuit | ||
| LIN communication circuit | ||
| Air conditioning amplifier assembly | ||
| ECM*1 | ||
| ECM*2 | ||
| ECM*5 | ||
| Temperature control: Output air is warmer or cooler than the set temperature or response is slow | Refrigerant shortage check using the intelligent tester | |
| Refrigerant volume | ||
| Refrigerant pressure | ||
| Air conditioning compressor magnetic clutch circuit*1 | ||
| Compressor lock sensor circuit*1 | ||
| Compressor solenoid circuit | ||
| Solar sensor circuit (for driver side) | ||
| Solar sensor circuit (for front passenger side) | ||
| Room temperature sensor circuit | ||
| Ambient temperature sensor circuit | ||
| Air mix damper control servo motor circuit (for driver side) | ||
| Air mix damper control servo motor circuit (for front passenger side) | ||
| Air inlet damper control servo motor circuit | ||
| LIN communication circuit | ||
| Radiator unit sub-assembly | ||
| Cooler expansion valve | ||
| Engine room junction block assembly*1 | ||
| Air conditioning amplifier assembly | ||
| ECM*1 | ||
| ECM*2 | ||
| ECM*5 | ||
| Temperature control: No temperature control (only Max. cool or Max. warm) | Air mix damper control servo motor circuit (for driver side) | |
| Air mix damper control servo motor circuit (for front passenger side) | ||
| Room temperature sensor circuit | ||
| Ambient temperature sensor circuit | ||
| Evaporator temperature sensor circuit | ||
| Solar sensor circuit (for driver side) | ||
| Solar sensor circuit (for front passenger side) | ||
| LIN communication circuit | ||
| Air conditioning amplifier assembly | ||
| No air inlet control | Air inlet damper control servo motor circuit | |
| LIN communication circuit | ||
| Air conditioning amplifier assembly | ||
| No air flow mode control | Air outlet damper control servo motor circuit | |
| LIN communication circuit | ||
| Air conditioning amplifier assembly | ||
| Rear seat temperature cannot be adjusted*3 | Rear air mix control servo motor circuit | |
| Rear LIN communication circuit | ||
| Air conditioning amplifier assembly | ||
| Ion generator does not operate*4 | Ion generator circuit | |
| LIN communication circuit | ||
| Air conditioning amplifier assembly | ||
| Diagnostic trouble codes (DTCs) are not recorded. Set mode is cleared when ignition switch is off. | Back-up power source circuit | |
| Air conditioning amplifier assembly |
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*1: for 2GR-FE
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*2: for 2AR-FE
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*3: for 3 Zone Type
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*4: w/ Ion Generator Assembly
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*5: for 1AZ-FE