Tech Tips
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.
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 | ||
| Air conditioning amplifier assembly | ||
| Air flow control: No blower operation | Blower motor circuit | |
| Air conditioning control panel circuit | ||
| Air conditioning amplifier assembly | ||
| Air flow control: No blower control | Blower motor circuit | |
| Air conditioning control panel circuit | ||
| Air conditioning amplifier assembly | ||
| Air flow control: Insufficient air flow | Blower motor circuit | |
| Air conditioning amplifier assembly | ||
| Temperature control: No cool air comes out | Refrigerant volume | |
| Refrigerant pressure | ||
| Air conditioning pressure 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 | ||
| Air conditioning control panel circuit | ||
| Expansion valve | ||
| CAN communication system | ||
| Air conditioning amplifier assembly | ||
| No. 2 engine wire | ||
| Compressor with motor assembly*4 | ||
| Compressor with motor assembly*5 | ||
| Power management control ECU | ||
| 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*2 | ||
| Exhaust heat recirculation system*3 | ||
| CAN communication system | ||
| Air conditioning amplifier assembly | ||
| Power management control ECU | ||
| 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) | ||
| 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 | ||
| Radiator unit sub-assembly | ||
| Expansion valve | ||
| Exhaust heat recirculation system*3 | ||
| CAN communication system | ||
| Air conditioning amplifier assembly | ||
| No. 2 engine wire | ||
| Compressor with motor assembly*4 | ||
| Compressor with motor assembly*5 | ||
| Power management control ECU | ||
| 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 | ||
| Air conditioning amplifier assembly | ||
| Heater performance is low (engine is stopped)*2 | PTC heater circuit | |
| Air conditioning amplifier assembly | ||
| No air inlet control | Air inlet damper control servo motor circuit | |
| Air conditioning control panel circuit | ||
| Air conditioning amplifier assembly | ||
| No air flow mode control | Air outlet damper control servo motor circuit | |
| Air conditioning control panel circuit | ||
| Air conditioning amplifier assembly | ||
| Windshield fogs up*1 | Glass temperature sensor circuit | |
| Glass surroundings temperature sensor circuit | ||
| Glass humidity sensor circuit | ||
| Air conditioning thermistor assembly | ||
| Air conditioning amplifier assembly | ||
| ECO switch does not operate normally | ECO switch circuit | |
| Air conditioning amplifier assembly | ||
| 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 | ||
| Air conditioning amplifier assembly | ||
| Diagnostic trouble codes (DTCs) are not stored. Set mode is cleared when power switch is off. | Back-up power source circuit | |
| Air conditioning amplifier assembly |
*1: w/ Air Conditioning Thermistor Assembly
*2: w/ PTC Heater Assembly
*3: w/ Exhaust Heat Recirculation System
*4: for 2ZR-FXE
*5: for 5ZR-FXE