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 | ||
| 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 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 | ||
| CAN communication system | ||
| A/C amplifier | ||
| No. 2 engine wire | ||
| Compressor with motor assembly | ||
| Power management control ECU | ||
| Temperature control: No warm air comes out | Air mix damper control servo motor circuit | |
| Engine coolant temperature sensor circuit | ||
| Evaporator temperature sensor circuit | ||
| Room temperature sensor circuit | ||
| Ambient temperature sensor circuit | ||
| Air conditioning control panel circuit | ||
| PTC heater circuit*1 | ||
| CAN communication system | ||
| Radiator unit sub-assembly | ||
| A/C amplifier | ||
| ECM | ||
| Temperature control: Output air is warmer or cooler than the set temperature or response is slow | Refrigerant volume | |
| Refrigerant pressure | ||
| Solar sensor circuit | ||
| Room temperature sensor circuit | ||
| Ambient temperature sensor circuit | ||
| Evaporator temperature sensor circuit | ||
| Air mix damper control servo motor circuit | ||
| Air inlet damper control servo motor circuit | ||
| PTC heater circuit*1 | ||
| Air conditioning control panel circuit | ||
| Radiator unit sub-assembly | ||
| Expansion valve | ||
| CAN communication system | ||
| A/C amplifier | ||
| No. 2 engine wire | ||
| Compressor with motor assembly | ||
| ECM | ||
| Power management control ECU | ||
| Temperature control: No temperature control (only Max. cool or Max. warm) | Air mix damper control servo motor circuit | |
| Room temperature sensor circuit | ||
| Ambient temperature sensor circuit | ||
| Evaporator temperature sensor circuit | ||
| Solar sensor circuit | ||
| 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 | ||
| Heater performance is low (engine is stopped)*1 | PTC heater circuit | |
| A/C amplifier | ||
| ECO MODE switch indicator does not come on (ECO MODE switch does not operate) | ECO switch circuit | |
| A/C amplifier |
*1: w/ PTC Heater Assembly