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 amplifier assembly | ||
| Air flow control: No blower operation. | Blower motor circuit | |
| Air conditioning amplifier assembly | ||
| Air flow control: No blower control. | Blower motor circuit | |
| Air conditioning amplifier assembly | ||
| Air flow control: Insufficient air flow. | Blower motor circuit | |
| Air conditioning amplifier assembly | ||
| Temperature control: less cool air comes out. | Refrigerant shortage check using the GTS | |
| Refrigerant pressure (for HFC-134a(R134a)) | ||
| Refrigerant pressure (for HFO-1234yf(R1234yf)) | ||
| Cooler expansion valve | - | |
| Compressor with pulley assembly (for 1KR-FE) | ||
| Compressor with pulley assembly (for 1NR-FE) | ||
| Compressor with pulley assembly (for 1ND-TV) | ||
| Air conditioning amplifier 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 pressure sensor circuit | ||
| Compressor solenoid circuit | ||
| Evaporator temperature sensor circuit | ||
| Ambient temperature sensor circuit | ||
| Heater control switch circuit | ||
| Air mix damper control cable sub-assembly | - | |
| Cooler expansion valve | - | |
| Air conditioning amplifier assembly | ||
| ECM (for 1KR-FE) | ||
| ECM (for 1NR-FE) | ||
| ECM (for 1ND-TV with DPF) | ||
| ECM (for 1ND-TV without DPF) | ||
| CAN communication system (w/ Toyota Safety Sense) | ||
| CAN communication system (w/o Toyota Safety Sense) | ||
| Temperature control: No warm air comes out. | Evaporator temperature sensor circuit | |
| Ambient temperature sensor circuit | ||
| Engine coolant temperature sensor circuit (for 1KR-FE) | ||
| Engine coolant temperature sensor circuit (for 1NR-FE) | ||
| Engine coolant temperature sensor circuit (for 1ND-TV with DPF) | ||
| Engine coolant temperature sensor circuit (for 1ND-TV without DPF) | ||
| PTC heater circuit*1 | ||
| Headlight signal circuit*1 | ||
| No. 3 heater control sub-assembly (MAX HOT switch*1) | ||
| Air mix damper control cable sub-assembly | - | |
| Air conditioning amplifier assembly | ||
| ECM (for 1KR-FE) | ||
| ECM (for 1NR-FE) | ||
| ECM (for 1ND-TV with DPF) | ||
| ECM (for 1ND-TV without DPF) | ||
| CAN communication system (w/ Toyota Safety Sense) | ||
| CAN communication system (w/o Toyota Safety Sense) | ||
| Harness or connector | - | |
| 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)) | ||
| Ambient temperature sensor circuit | ||
| Engine coolant temperature sensor circuit (for 1KR-FE) | ||
| Engine coolant temperature sensor circuit (for 1NR-FE) | ||
| Engine coolant temperature sensor circuit (for 1ND-TV with DPF) | ||
| Engine coolant temperature sensor circuit (for 1ND-TV without DPF) | ||
| Air mix damper control cable sub-assembly | - | |
| Radiator unit sub-assembly | - | |
| Cooler expansion valve | - | |
| Air conditioning amplifier assembly | ||
| ECM (for 1KR-FE) | ||
| ECM (for 1NR-FE) | ||
| ECM (for 1ND-TV with DPF) | ||
| ECM (for 1ND-TV without DPF) | ||
| CAN communication system (w/ Toyota Safety Sense) | ||
| CAN communication system (w/o Toyota Safety Sense) | ||
| Temperature control: No temperature control (only Max. cool or Max. hot). | Ambient temperature sensor circuit | |
| Evaporator temperature sensor circuit | ||
| No. 3 heater control sub-assembly (MAX HOT switch*1) | ||
| Engine coolant temperature sensor circuit (for 1KR-FE) | ||
| Engine coolant temperature sensor circuit (for 1NR-FE) | ||
| Engine coolant temperature sensor circuit (for 1ND-TV with DPF) | ||
| Engine coolant temperature sensor circuit (for 1ND-TV without DPF) | ||
| Air mix damper control cable sub-assembly | - | |
| Air conditioning amplifier assembly | ||
| ECM (for 1KR-FE) | ||
| ECM (for 1NR-FE) | ||
| ECM (for 1ND-TV with DPF) | ||
| ECM (for 1ND-TV without DPF) | ||
| CAN communication system (w/ Toyota Safety Sense) | ||
| CAN communication system (w/o Toyota Safety Sense) | ||
| No air inlet control. | Air inlet damper control cable sub-assembly | - |
| No air flow mode control. | Defroster damper control cable sub-assembly | - |
| Engine idle speed increase does not occur, or is continuous. | Compressor solenoid circuit | |
| Heater control switch circuit | ||
| Air conditioning amplifier assembly | ||
| ECM (for 1KR-FE) | ||
| ECM (for 1NR-FE) | ||
| ECM (for 1ND-TV with DPF) | ||
| ECM (for 1ND-TV without DPF) | ||
| CAN communication system (w/ Toyota Safety Sense) | ||
| CAN communication system (w/o Toyota Safety Sense) | ||
| A/C indicator blinking. | Compressor solenoid circuit |
*1: w/ PTC Heater
| Symptom | Suspected Area | See page |
|---|---|---|
| All functions of the heater system do not operate. | IG power source circuit*1 | |
| Air conditioning amplifier assembly | ||
| Air flow control: No blower operation. | Blower motor circuit | |
| Air conditioning amplifier assembly | ||
| Air flow control: No blower control. | Blower motor circuit | |
| Air conditioning amplifier assembly | ||
| Air flow control: Insufficient air flow. | Blower motor circuit | |
| Air conditioning amplifier assembly | ||
| Temperature control: No warm air comes out. | Ambient temperature sensor circuit*1 | |
| Engine coolant temperature sensor circuit (for 1KR-FE)*1 | ||
| Engine coolant temperature sensor circuit (for 1NR-FE)*1 | ||
| Engine coolant temperature sensor circuit (for 1ND-TV with DPF)*1 | ||
| Engine coolant temperature sensor circuit (for 1ND-TV without DPF)*1 | ||
| PTC heater circuit*1 | ||
| Headlight signal circuit*1 | ||
| No. 3 heater control sub-assembly (MAX HOT switch*1) | ||
| Air mix damper control cable sub-assembly | - | |
| Air conditioning amplifier assembly | ||
| ECM (for 1KR-FE)*1 | ||
| ECM (for 1NR-FE)*1 | ||
| ECM (for 1ND-TV with DPF)*1 | ||
| ECM (for 1ND-TV without DPF)*1 | ||
| CAN communication system (w/ Toyota Safety Sense)*1 | ||
| CAN communication system (w/o Toyota Safety Sense)*1 | ||
| Harness or connector | - | |
| Temperature control: Output air is warmer than the set temperature or response is slow. | Ambient temperature sensor circuit*1 | |
| Engine coolant temperature sensor circuit (for 1KR-FE)*1 | ||
| Engine coolant temperature sensor circuit (for 1NR-FE)*1 | ||
| Engine coolant temperature sensor circuit (for 1ND-TV with DPF)*1 | ||
| Engine coolant temperature sensor circuit (for 1ND-TV without DPF)*1 | ||
| Air mix damper control cable sub-assembly | - | |
| Radiator unit sub-assembly | - | |
| Air conditioning amplifier assembly | ||
| ECM (for 1KR-FE)*1 | ||
| ECM (for 1NR-FE)*1 | ||
| ECM (for 1ND-TV with DPF)*1 | ||
| ECM (for 1ND-TV without DPF)*1 | ||
| CAN communication system (w/ Toyota Safety Sense)*1 | ||
| CAN communication system (w/o Toyota Safety Sense)*1 | ||
| Temperature control: No temperature control (only Min. hot or Max. hot). | Ambient temperature sensor circuit*1 | |
| No. 3 heater control sub-assembly (MAX HOT switch*1) | ||
| Engine coolant temperature sensor circuit (for 1KR-FE)*1 | ||
| Engine coolant temperature sensor circuit (for 1NR-FE)*1 | ||
| Engine coolant temperature sensor circuit (for 1ND-TV with DPF)*1 | ||
| Engine coolant temperature sensor circuit (for 1ND-TV without DPF)*1 | ||
| Air mix damper control cable sub-assembly | - | |
| Air conditioning amplifier assembly | ||
| ECM (for 1KR-FE)*1 | ||
| ECM (for 1NR-FE)*1 | ||
| ECM (for 1ND-TV with DPF)*1 | ||
| ECM (for 1ND-TV without DPF)*1 | ||
| CAN communication system (w/ Toyota Safety Sense)*1 | ||
| CAN communication system (w/o Toyota Safety Sense)*1 | ||
| No air inlet control. | Air inlet damper control cable sub-assembly | - |
| No air flow mode control. | Defroster damper control cable sub-assembly | - |
| Engine idle speed increase does not occur, or is continuous.*1 | Air conditioning amplifier assembly | |
| ECM (for 1KR-FE) | ||
| ECM (for 1NR-FE) | ||
| ECM (for 1ND-TV with DPF) | ||
| ECM (for 1ND-TV without DPF) | ||
| CAN communication system (w/ Toyota Safety Sense) | ||
| CAN communication system (w/o Toyota Safety Sense) |
*1: w/ PTC Heater