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 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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As the operation of the quick heater may be limited due to battery voltage reduction history in the power steering system, proceed according to "How to Proceed with Troubleshooting".*
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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 | Proceed to "IG Power Source Circuit" | |
| Proceed to "Back-up Power Source Circuit" | ||
| Proceed to "Air Conditioning Control Panel Circuit" | ||
| Replace air conditioning amplifier assembly | ||
| Proceed to "LIN Communication System" | ||
| Air Flow Control: No blower operation | Proceed to "Blower Motor Circuit" | |
| Proceed to "Air Conditioning Control Panel Circuit" | ||
| Replace air conditioning amplifier assembly | ||
| Proceed to "LIN Communication System" | ||
| Air Flow Control: No blower control | Proceed to "Blower Motor Circuit" | |
| Proceed to "Air Conditioning Control Panel Circuit" | ||
| Replace air conditioning amplifier assembly | ||
| Replace air conditioning control assembly | ||
| Proceed to "LIN Communication System" | ||
| Air Flow Control: Insufficient air flow | Proceed to "Blower Motor Circuit" | |
| Replace air conditioning amplifier assembly | ||
| Temperature Control: No cool air comes out | Check volume of refrigerant | |
| Check for refrigerant gas leak | ||
| Replace cooler expansion valve | ||
| Check compressor assembly with pulley (for AD Series Engine) | ||
| Check compressor assembly with pulley (for ZR Series Engine) | ||
| Proceed to "Pressure Sensor Circuit" | ||
| Proceed to "Compressor Solenoid Circuit" | ||
| Proceed to "Air Mix Damper Control Servo Motor Circuit (Driver Side)" | ||
| Proceed to "Air Mix Damper Control Servo Motor Circuit (Passenger Side)" | ||
| Proceed to "Room Temperature Sensor Circuit" | ||
| Proceed to "Ambient Temperature Sensor Circuit" | ||
| Proceed to "Evaporator Temperature Sensor Circuit" | ||
| Proceed to "Driver Side Solar Sensor Short Circuit" | ||
| Proceed to "Front Passenger Side Solar Sensor Short Circuit" | ||
| Proceed to "BUS IC Communication Malfunction" | ||
| Proceed to "Air Conditioning Control Panel Circuit" | ||
| Replace air mix control servo motor (for front passenger side) | ||
| Replace air mix control servo motor (for driver side) | ||
| Replace air conditioning harness assembly | ||
| Replace air conditioning amplifier assembly | ||
| Proceed to "CAN Communication System" | ||
| Proceed to "LIN Communication System" | ||
| Temperature Control: No warm air comes out | Proceed to "Air Conditioning Control Panel Circuit" | |
| Proceed to "Air Mix Damper Control Servo Motor Circuit (Driver Side)" | ||
| Proceed to "Air Mix Damper Control Servo Motor Circuit (Passenger Side)" | ||
| Proceed to "Room Temperature Sensor Circuit" | ||
| Proceed to "Ambient Temperature Sensor Circuit" | ||
| Proceed to "Driver Side Solar Sensor Short Circuit" | ||
| Proceed to "Front Passenger Side Solar Sensor Short Circuit" | ||
| Proceed to "BUS IC Communication Malfunction" | ||
| Replace air mix control servo motor (for front passenger side) | ||
| Replace air mix control servo motor (for driver side) | ||
| Replace air conditioning harness assembly | ||
| Replace air conditioning amplifier assembly | ||
| Proceed to "CAN Communication System" | ||
| Proceed to "LIN Communication System" | ||
| Temperature Control: Output air is warmer or cooler than the set temperature or response is slow | Check volume of refrigerant | |
| Check for refrigerant gas leak | ||
| Replace cooler expansion valve | ||
| Check compressor assembly with pulley (for AD Series Engine) | ||
| Check compressor assembly with pulley (for ZR Series Engine) | ||
| Replace heater radiator unit sub-assembly | ||
| Proceed to "Pressure Sensor Circuit" | ||
| Proceed to "Compressor Solenoid Circuit" | ||
| Proceed to "Air Mix Damper Control Servo Motor Circuit (Driver Side)" | ||
| Proceed to "Air Mix Damper Control Servo Motor Circuit (Passenger Side)" | ||
| Proceed to "Air Inlet Damper Control Servo Motor Circuit" | ||
| Proceed to "Room Temperature Sensor Circuit" | ||
| Proceed to "Ambient Temperature Sensor Circuit" | ||
| Proceed to "Evaporator Temperature Sensor Circuit" | ||
| Proceed to "Driver Side Solar Sensor Short Circuit" | ||
| Proceed to "Front Passenger Side Solar Sensor Short Circuit" | ||
| Proceed to "BUS IC Communication Malfunction" | ||
| Proceed to "Air Conditioning Control Panel Circuit" | ||
| Replace air mix control servo motor (for front passenger side) | ||
| Replace air mix control servo motor (for driver side) | ||
| Replace damper servo sub-assembly | ||
| Replace air conditioning harness assembly | ||
| Replace air conditioning amplifier assembly | ||
| Proceed to "CAN Communication System" | ||
| Proceed to "LIN Communication System" | ||
| Temperature Control: No temperature control (only MAX COOL or MAX WARM) | Proceed to "Air Conditioning Control Panel Circuit" | |
| Proceed to "Compressor Solenoid Circuit" | ||
| Proceed to "Air Mix Damper Control Servo Motor Circuit (Driver Side)" | ||
| Proceed to "Air Mix Damper Control Servo Motor Circuit (Passenger Side)" | ||
| Proceed to "Room Temperature Sensor Circuit" | ||
| Proceed to "Ambient Temperature Sensor Circuit" | ||
| Proceed to "Evaporator Temperature Sensor Circuit" | ||
| Proceed to "Driver Side Solar Sensor Short Circuit" | ||
| Proceed to "Front Passenger Side Solar Sensor Short Circuit" | ||
| Proceed to "BUS IC Communication Malfunction" | ||
| Replace air mix control servo motor (for front passenger side) | ||
| Replace air mix control servo motor (for driver side) | ||
| Replace air conditioning harness assembly | ||
| Replace air conditioning amplifier assembly | ||
| Proceed to "CAN Communication System" | ||
| Proceed to "LIN Communication System" | ||
| No air inlet control | Proceed to "BUS IC Communication Malfunction" | |
| Proceed to "Air Inlet Damper Control Servo Motor Circuit" | ||
| Replace damper servo sub-assembly | ||
| Replace air conditioning harness assembly | ||
| Replace air conditioning amplifier assembly | ||
| No air flow mode control | Proceed to "BUS IC Communication Malfunction" | |
| Proceed to "Air Outlet Damper Control Servo Motor Circuit" | ||
| Replace air outlet control servo motor | ||
| Replace air conditioning harness assembly | ||
| Replace air conditioning amplifier assembly | ||
| Engine coolant does not warm up quickly when the engine is cold (PTC heater does not operate)* | Proceed to "PTC Heater Circuit" | |
| Proceed to "Generator Signal Circuit" | ||
| Check generator assembly (for 1ZR-FAE) | ||
| Check generator assembly (for 2ZR-FAE) | ||
| Check generator assembly (for 1AD-FTV) | ||
| Check generator assembly (for 2AD-FHV) | ||
| Proceed to "Headlight Signal Circuit" | ||
| Replace air conditioning amplifier assembly | ||
| Rear window defogger, quick heater and mirror heater do not operate* | Proceed to "Power Steering System (battery voltage reduction history)" | |
| Engine idle up does not occur or is continuous | Proceed to "Compressor Solenoid Circuit" | |
| Proceed to "Air Conditioning Control Panel Circuit" | ||
| Replace air conditioning amplifier assembly | ||
| Replace ECM (for 1ZR-FAE) | ||
| Replace ECM (for 2ZR-FAE) | ||
| Replace ECM (for 1AD-FTV) | ||
| Replace ECM (for 2AD-FHV) | ||
| Proceed to "CAN Communication System" | ||
| Proceed to "LIN Communication System" | ||
| Blinking of air conditioning switch indicator | Proceed to "Air Conditioning Control Panel Circuit" | |
| Replace air conditioning amplifier assembly | ||
| Proceed to "LIN Communication System" | ||
| Diagnostic trouble codes are not stored, and set mode is cleared when ignition switch is off | Proceed to "Back-up Power Source Circuit" | |
| Replace air conditioning amplifier assembly |
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*: w/ PTC Heater