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 | |
| Air conditioning control assembly | ||
| Switch operation not possible | Air conditioning control assembly | |
| Air flow control: No blower operation | Blower motor circuit | |
| Air conditioning control assembly | ||
| Blower motor control | ||
| Air flow control: No blower control | Blower motor circuit | |
| Air conditioning control assembly | ||
| Blower motor control | ||
| Temperature control: cooling effectiveness is poor | Refrigerant volume (for HFC-134a(R134a)) | |
| Refrigerant volume (for HFO-1234yf(R1234yf)) | ||
| Refrigerant pressure (for HFC-134a(R134a)) | ||
| Refrigerant pressure (for HFO-1234yf(R1234yf)) | ||
| Cooler expansion valve | ||
| Compressor with magnet clutch | ||
| Air conditioning control assembly | ||
| Temperature control: No cool air comes out | Refrigerant volume (for HFC-134a(R134a)) | |
| Refrigerant volume (for HFO-1234yf(R1234yf)) | ||
| Refrigerant pressure (for HFC-134a(R134a)) | ||
| Refrigerant pressure (for HFO-1234yf(R1234yf)) | ||
| Air conditioner tube and accessory assembly (Pressure switch) | - | |
| Compressor with magnet clutch | - | |
| Air conditioning compressor magnetic clutch circuit | ||
| Air mix damper control servo motor circuit (for driver side) | ||
| Air mix damper control servo motor circuit (for front passenger side) | ||
| Automatic light control sensor circuit | ||
| Evaporator temperature sensor circuit | ||
| Cooler (room temp. sensor) thermistor circuit | ||
| Ambient temperature sensor circuit | ||
| Cooler expansion valve | ||
| Air conditioning control assembly | ||
| Aspirator pipe | ||
| 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 | ||
| Cooler (room temp. sensor) thermistor circuit | ||
| Ambient temperature sensor circuit | ||
| Air conditioning control assembly | ||
| Aspirator pipe | ||
| Temperature control: Output air is warmer or cooler than the set temperature or response is slow | Refrigerant volume (for HFC-134a(R134a)) | |
| Refrigerant volume (for HFO-1234yf(R1234yf)) | ||
| Refrigerant pressure (for HFC-134a(R134a)) | ||
| Refrigerant pressure (for HFO-1234yf(R1234yf)) | ||
| Solar sensor circuit (for driver side) | ||
| Cooler (room temp. sensor) thermistor 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) | ||
| No. 1 air conditioning radiator damper servo sub-assembly | ||
| Radiator unit sub-assembly | ||
| Cooler expansion valve | ||
| Air conditioning control assembly | ||
| Temperature adjustment not possible (temperature cannot be changed) | Air mix damper control servo motor circuit (for driver side) | |
| Air mix damper control servo motor circuit (for front passenger side) | ||
| Air conditioning control assembly | ||
| Aspirator pipe | ||
| Temperature control: No temperature control (only Max. cool or Max. warm) | Cooler (room temp. sensor thermistor) circuit | |
| Ambient temperature sensor circuit | ||
| Air conditioning control assembly | ||
| Aspirator pipe | ||
| No air inlet control | Air conditioning control assembly | |
| No. 1 air conditioning radiator damper servo sub-assembly | ||
| DTC not stored (set mode cleared when ignition switch turned to ON) | Air conditioning control assembly | |
| No air flow mode control | Air outlet damper control servo motor circuit | |
| Air conditioning control assembly | ||
| Diagnostic trouble codes (DTCs) are not recorded. Set mode is cleared when ignition switch is off. | Back-up power source circuit | |
| Air conditioning control assembly |