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 | ||
| Air conditioning control panel circuit | ||
| A/C amplifier | ||
| Air Flow Control: No blower operation | Blower motor circuit | |
| Air conditioning control panel circuit | ||
| A/C amplifier | ||
| Air Flow Control: No blower control | Blower motor circuit | |
| Air conditioning control panel circuit | ||
| A/C amplifier | ||
| Air Flow Control: Insufficient air flow | Blower motor circuit | |
| A/C amplifier | ||
| Temperature Control: No cool air comes out | Refrigerant volume | |
| Refrigerant pressure | ||
| Air conditioning pressure sensor circuit | ||
| Air conditioning compressor magnetic clutch circuit*1 | ||
| Compressor lock sensor circuit*1 | ||
| Compressor solenoid circuit*2 | ||
| 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 | ||
| Air conditioning control panel circuit | ||
| Expansion valve | ||
| A/C amplifier | ||
| ECM (for 2GR-FE) | ||
| ECM (for 2AZ-FE) | ||
| 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 | ||
| Air conditioning control panel circuit | ||
| PTC heater circuit*6 | ||
| A/C amplifier | ||
| ECM (for 2GR-FE) | ||
| ECM (for 2AZ-FE) | ||
| Temperature Control: Output air is warmer or cooler than the set temperature or response is slow | Refrigerant volume | |
| Refrigerant pressure | ||
| Air conditioning compressor magnetic clutch circuit*1 | ||
| Compressor lock sensor circuit*1 | ||
| Compressor solenoid circuit*2 | ||
| 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 | ||
| Air conditioning control panel circuit | ||
| PTC heater circuit*6 | ||
| Radiator unit sub-assembly | ||
| Expansion valve | ||
| A/C amplifier | ||
| ECM (for 2GR-FE) | ||
| ECM (for 2AZ-FE) | ||
| 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) | ||
| Air conditioning control panel circuit | ||
| A/C amplifier | ||
| No air inlet control | Air inlet damper control servo motor circuit | |
| Air conditioning control panel circuit | ||
| A/C amplifier | ||
| No air flow mode control | Air outlet damper control servo motor circuit | |
| Air conditioning control panel circuit | ||
| A/C amplifier | ||
| Engine idle up does not occur, or is continuous | Air conditioning compressor magnetic clutch circuit*1 | |
| Compressor lock sensor circuit*1 | ||
| Compressor solenoid circuit*2 | ||
| A/C amplifier | ||
| Blinking of A/C indicator | Air conditioning compressor magnetic clutch circuit*1 | |
| Compressor lock sensor circuit*1 | ||
| Compressor solenoid circuit*2 | ||
| A/C amplifier | ||
| Pollen removal mode does not operate (A/C system is operating normally) | Air inlet damper control servo motor circuit | |
| Air outlet damper control servo motor circuit | ||
| Blower motor circuit | ||
| Air conditioning control panel circuit | ||
| A/C amplifier | ||
| Ion generator assembly does not operate.*3 | Ion generator circuit | |
| Ion generator switch circuit | ||
| Air conditioning control panel circuit | ||
| A/C amplifier | ||
| Ion generator switch assembly indicator does not come on.*3 | Wire harness or connector | - |
| Ion generator switch | ||
| A/C amplifier | ||
| Eco switch assembly does not operate normally. | ECO switch circuit | |
| A/C amplifier | ||
| Auto recirculation control function does not operate normally.*5 | Smog ventilation sensor circuit (for HC, CO) | |
| Smog ventilation sensor circuit (for NOx) | ||
| Room temperature sensor circuit | ||
| Ambient temperature sensor circuit | ||
| Air inlet damper control servo motor circuit | ||
| Air conditioning control panel circuit | ||
| A/C amplifier | ||
| Diagnostic trouble codes (DTCs) are not recorded. Set mode is cleared when engine switch is off. | Back-up power source circuit | |
| A/C amplifier |
| Symptom | Suspected Area | See page |
|---|---|---|
| All functions of the rear A/C system do not operate | IG power source circuit | |
| Back-up power source circuit | ||
| Rear air conditioning control panel circuit | ||
| A/C amplifier | ||
| Air Flow Control: No blower operation | Rear blower motor circuit | |
| Rear air conditioning control panel circuit | ||
| A/C amplifier | ||
| Air Flow Control: No blower control | Rear blower motor circuit | |
| Rear air conditioning control panel circuit | ||
| A/C amplifier | ||
| Air Flow Control: Insufficient air flow | Rear blower motor circuit | |
| Rear air conditioning control panel circuit | ||
| A/C amplifier | ||
| Temperature Control: No cool air comes out | Refrigerant volume | |
| Refrigerant pressure | ||
| Air conditioning pressure sensor circuit | ||
| Air conditioning compressor magnetic clutch circuit*1 | ||
| Compressor lock sensor circuit*1 | ||
| Compressor solenoid circuit*2 | ||
| Rear air mix damper control servo motor circuit | ||
| Rear evaporator temperature sensor circuit | ||
| Rear room temperature sensor circuit | ||
| Ambient temperature sensor circuit | ||
| Rear air conditioning control panel circuit | ||
| Expansion valve (for Rear air conditioning unit) | ||
| CAN communication system | ||
| A/C amplifier | ||
| ECM (for 2GR-FE) | ||
| ECM (for 2AZ-FE) | ||
| Temperature Control: No warm air comes out | Rear air mix damper control servo motor circuit | |
| Rear evaporator temperature sensor circuit | ||
| Rear room temperature sensor circuit | ||
| Ambient temperature sensor circuit | ||
| Rear air conditioning control panel circuit | ||
| Engine coolant temperature sensor circuit | ||
| Heater radiator unit sub-assembly (for Rear air conditioning unit) | ||
| CAN communication system | ||
| A/C amplifier | ||
| ECM (for 2GR-FE) | ||
| ECM (for 2AZ-FE) | ||
| Temperature Control: Output air is warmer or cooler than the set temperature or response is slow | Refrigerant volume | |
| Refrigerant pressure | ||
| Solar sensor circuit (for Driver side) | ||
| Solar sensor circuit (for Front passenger side) | ||
| Rear room temperature sensor circuit | ||
| Rear evaporator temperature sensor circuit | ||
| Ambient temperature sensor circuit | ||
| Rear air mix damper control servo motor circuit | ||
| Rear air conditioning control panel circuit | ||
| Engine coolant temperature sensor circuit | ||
| Expansion valve (for Rear air conditioning unit) | ||
| Heater radiator unit sub-assembly (for Rear air conditioning unit) | ||
| CAN communication system | ||
| A/C amplifier | ||
| ECM (for 2GR-FE) | ||
| ECM (for 2AZ-FE) | ||
| Temperature Control: No temperature control (only Max. cool or Max. hot) | Rear air mix damper control servo motor circuit | |
| Rear room temperature sensor circuit | ||
| Solar sensor circuit (for Driver side) | ||
| Solar sensor circuit (for Front passenger side) | ||
| Rear evaporator temperature sensor circuit | ||
| Ambient temperature sensor circuit | ||
| Engine coolant temperature sensor circuit | ||
| CAN communication system | ||
| A/C amplifier | ||
| No air flow mode control | Rear air outlet damper control servo motor circuit | |
| Rear air conditioning control panel circuit | ||
| A/C amplifier | ||
| No. 2 ion generator sub-assembly does not operate.*4 | Rear ion generator circuit | |
| Ion generator switch circuit | ||
| Rear air conditioning control panel circuit | ||
| Air conditioning control panel circuit | ||
| A/C amplifier |
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*1: for 2GR-FE
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*2: for 2AZ-FE
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*3: w/ No. 1 Ion Generator Sub-assembly
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*4: w/ No. 2 Ion Generator Sub-assembly
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*5: w/ Automatic Recirculation Control System
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*6: w/ PTC Heater Assembly