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 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 | ||
| 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 | ||
| 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 | ||
| 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 (for HFC-134a (R134a)) | |
| Check volume of refrigerant (for HFO-1234f (R1234yf)) | ||
| Check for refrigerant gas leak (for HFC-134a (R134a)) | ||
| Check for refrigerant gas leak (for HFO-1234f (R1234yf)) | ||
| Replace cooler expansion valve | ||
| Check cooler compressor assembly (for 2TR-FE) | ||
| Check cooler compressor assembly (for 1GR-FE) | ||
| Check cooler compressor assembly (for 1KD-FTV) | ||
| Check cooler compressor assembly (for 1GD-FTV) | ||
| Proceed to "Pressure Sensor Circuit" | ||
| Check No. 1 pressure switch*2 | ||
| Proceed to "Air Conditioning Compressor Magnetic Clutch Circuit" | ||
| Proceed to "Compressor Lock Sensor 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 damper servo sub-assembly (driver side air mix damper servo) | ||
| Replace damper servo sub-assembly (front passenger side air mix damper servo) | ||
| Replace air conditioning harness assembly | ||
| Replace air conditioning amplifier assembly | ||
| 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 damper servo sub-assembly (driver side air mix damper servo) | ||
| Replace damper servo sub-assembly (front passenger side air mix damper servo) | ||
| Replace air conditioning harness assembly | ||
| Replace air conditioning amplifier assembly | ||
| LIN communication system | ||
| Temperature Control: Output air is warmer or cooler than set temperature or response is slow | Check volume of refrigerant (for HFC-134a (R134a)) | |
| Check volume of refrigerant (for HFO-1234f (R1234yf)) | ||
| Check for refrigerant gas leak (for HFC-134a (R134a)) | ||
| Check for refrigerant gas leak (for HFO-1234f (R1234yf)) | ||
| Replace cooler expansion valve | ||
| Check cooler compressor assembly (for 2TR-FE) | ||
| Check cooler compressor assembly (for 1GR-FE) | ||
| Check cooler compressor assembly (for 1KD-FTV) | ||
| Check cooler compressor assembly (for 1GD-FTV) | ||
| Replace heater radiator unit sub-assembly | ||
| Proceed to "Pressure Sensor Circuit" | ||
| Check No. 1 pressure switch*2 | ||
| Proceed to "Air Conditioning Compressor Magnetic Clutch Circuit" | ||
| Proceed to "Compressor Lock Sensor 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 damper servo sub-assembly (driver side air mix damper servo) | ||
| Replace damper servo sub-assembly (front passenger side air mix damper servo) | ||
| Replace recirculation damper servo sub-assembly | ||
| Replace air conditioning harness assembly | ||
| Replace air conditioning amplifier assembly | ||
| LIN communication system | ||
| Temperature Control: No temperature control (only MAX COOL or MAX WARM) | 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 "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 damper servo sub-assembly (driver side air mix damper servo) | ||
| Replace damper servo sub-assembly (front passenger side air mix damper servo) | ||
| Replace air conditioning harness assembly | ||
| Replace air conditioning amplifier assembly | ||
| LIN communication system | ||
| No air inlet control | Proceed to "BUS IC Communication Malfunction" | |
| Proceed to "Air Inlet Damper Control Servo Motor Circuit" | ||
| Replace recirculation 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 damper servo sub-assembly (mode damper servo) | ||
| Replace air conditioning harness assembly | ||
| Replace air conditioning amplifier assembly | ||
| Engine coolant does not warm up quickly when engine is cold (PTC heater does not operate)*1 | Proceed to "PTC Heater Circuit" | |
| Proceed to "Generator Signal Circuit" | ||
| Replace generator assembly (for 1GR-FE) | ||
| Replace generator assembly (for 1KD-FTV) | ||
| Replace air conditioning amplifier assembly | ||
| Viscous with magnet clutch heater assembly does not operate when heater switch assembly is pushed while engine is cold*3 | Proceed to "Viscous Heater with Magnet Clutch Circuit" | |
| Replace air conditioning amplifier assembly | ||
| CAN communication system (for LHD with Entry and Start System) | ||
| CAN communication system (for RHD with Entry and Start System) | ||
| Engine idle up does not occur when idle up switch is pushed while engine is cold*4 | Proceed to "Idle Up Switch Circuit" | |
| Replace air conditioning amplifier assembly | ||
| CAN communication system (for LHD with Entry and Start System) | ||
| CAN communication system (for RHD with Entry and Start System) | ||
| Engine idle up does not occur or is continuous | Replace air conditioning amplifier assembly | |
| Replace ECM (for 2TR-FE) | ||
| Replace ECM (for 1GR-FE) | ||
| Replace ECM (for 1KD-FTV) | ||
| Replace ECM (for 1GD-FTV) | ||
| CAN communication system (for LHD with Entry and Start System) | ||
| CAN communication system (for LHD without Entry and Start System) | ||
| CAN communication system (for RHD with Entry and Start System) | ||
| CAN communication system (for RHD without Entry and Start 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 |
*1: w/ PTC Heater
*2: for Switch Type
*3: w/ Viscous Heater
*4: w/ Idle Up Switch
| Symptom | Suspected Area | See page |
|---|---|---|
| All functions of A/C system do not operate | Proceed to "IG Power Source Circuit" | |
| Proceed to "Back-up Power Source Circuit" | ||
| Proceed to "Rear Air Conditioning Control Panel Circuit" | ||
| Replace air conditioning amplifier assembly | ||
| LIN communication system | ||
| Air Flow Control: No blower operation | Proceed to "Rear Blower Motor Circuit" | |
| Proceed to "Rear Air Conditioning Control Panel Circuit" | ||
| Replace air conditioning amplifier assembly | ||
| LIN communication system | ||
| Air Flow Control: No blower control | Proceed to "Rear Blower Motor Circuit" | |
| Proceed to "Rear Air Conditioning Control Panel Circuit" | ||
| Replace air conditioning amplifier assembly | ||
| LIN communication system | ||
| Temperature Control: No cool air comes out | Proceed to "Rear Evaporator Temperature Sensor Circuit" | |
| Proceed to "Rear Air Mix Damper Control Servo Motor Circuit" | ||
| Proceed to "Rear Room Temperature Sensor Circuit" | ||
| Proceed to "Rear Air Conditioning Control Panel Circuit" | ||
| Replace rear air mix damper servo sub-assembly | ||
| Harness or connector | ||
| Replace air conditioning amplifier assembly | ||
| LIN communication system | ||
| Temperature Control: No warm air comes out | Proceed to "Rear Air Mix Damper Control Servo Motor Circuit" | |
| Proceed to "Rear Room Temperature Sensor Circuit" | ||
| Proceed to "Rear Air Conditioning Control Panel Circuit" | ||
| Replace rear air mix damper servo sub-assembly | ||
| Harness or connector | ||
| Replace air conditioning amplifier assembly | ||
| LIN communication system | ||
| Temperature Control: Output air is warmer or cooler than set temperature or response is slow | Proceed to "Rear Air Mix Damper Control Servo Motor Circuit" | |
| Proceed to "Rear Room Temperature Sensor Circuit" | ||
| Proceed to "Rear Evaporator Temperature Sensor Circuit" | ||
| Proceed to "Rear Air Conditioning Control Panel Circuit" | ||
| Replace rear air mix damper servo sub-assembly | ||
| Harness or connector | ||
| Replace air conditioning amplifier assembly | ||
| LIN communication system | ||
| Temperature Control: No temperature control (only MAX COOL or MAX WARM) | Proceed to "Rear Air Mix Damper Control Servo Motor Circuit" | |
| Proceed to "Rear Room Temperature Sensor Circuit" | ||
| Proceed to "Rear Evaporator Temperature Sensor Circuit" | ||
| Proceed to "Rear Air Conditioning Control Panel Circuit" | ||
| Replace rear air mix damper servo sub-assembly | ||
| Harness or connector | ||
| Replace air conditioning amplifier assembly | ||
| LIN communication system | ||
| No air flow mode control | Proceed to "Rear Air Outlet Damper Control Servo Motor Circuit" | |
| Proceed to "Rear Air Conditioning Control Panel Circuit" | ||
| Replace rear mode damper servo sub-assembly | ||
| Harness or connector | ||
| Replace air conditioning amplifier assembly | ||
| LIN communication system |
| Symptom | Suspected Area | See page |
|---|---|---|
| Cooling box malfunction | Proceed to "Cooling Box Circuit" | |
| Replace cooler magnet valve assembly | ||
| Replace air conditioning amplifier assembly (for cooling box) | ||
| Replace air conditioning amplifier assembly |