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 | Link |
|---|---|---|
| All functions of the air conditioning system do not operate. | IG power source circuit | |
| Back-up power source circuit | ||
| LIN communication circuit | ||
| Air conditioning amplifier assembly | ||
| Air flow control: No blower operation. (blower motor does not operate) | Blower motor circuit | |
| LIN communication circuit | ||
| Air conditioning amplifier assembly | ||
| Air flow control: No blower control. (blower motor does not change speed) | Blower motor circuit | |
| LIN communication circuit | ||
| Air conditioning amplifier assembly | ||
| Air flow control: Insufficient air flow. | Blower motor circuit | |
| Air conditioning amplifier assembly | ||
| Temperature control: Cooling effectiveness is poor. | Refrigerant volume | |
| Refrigerant pressure | ||
| Check refrigerant line | ||
| No. 1 cooler expansion valve | ||
| Compressor assembly with magnet clutch (for 1GR-FE) | ||
| Compressor assembly with magnet clutch (for 1GD-FTV, 2GD-FTV) | ||
| Compressor assembly with magnet clutch (for 2KD-FTV) | ||
| Compressor assembly with magnet clutch (for 2TR-FE) | ||
| Magnet clutch assembly (for 1GR-FE) | ||
| Magnet clutch assembly (for 1GD-FTV, 2GD-FTV) | ||
| Magnet clutch assembly (for 2KD-FTV) (w/ Magnet Clutch Assembly) | ||
| Magnet clutch assembly (for 2TR-FE) | ||
| Air conditioning amplifier assembly | ||
| Temperature control: No cool air comes out. | Refrigerant volume | |
| Refrigerant pressure | ||
| Check refrigerant line | ||
| Air mix damper control servo motor circuit (front side air mix) | ||
| Air conditioning compressor magnetic clutch circuit | ||
| Evaporator temperature sensor circuit | ||
| Room temperature sensor circuit | ||
| Ambient temperature sensor circuit | ||
| LIN communication circuit | ||
| No. 1 cooler expansion valve | ||
| No. 1 air conditioning radiator damper servo sub-assembly | ||
| Air conditioning harness assembly | ||
| Air conditioner pressure switch | ||
| Compressor assembly with magnet clutch (for 1GR-FE) | ||
| Compressor assembly with magnet clutch (for 1GD-FTV, 2GD-FTV) | ||
| Compressor assembly with magnet clutch (for 2KD-FTV) | ||
| Compressor assembly with magnet clutch (for 2TR-FE) | ||
| Air conditioning amplifier assembly | ||
| ECM (for 1GR-FE) | ||
| ECM (for 1GD-FTV) | ||
| ECM (for 2GD-FTV) | ||
| ECM (for 2KD-FTV) | ||
| ECM (for 2TR-FE) | ||
| Temperature control: No warm air comes out. | Air mix damper control servo motor circuit (front side air mix) | |
| Evaporator temperature sensor circuit | ||
| Room temperature sensor circuit | ||
| Ambient temperature sensor circuit | ||
| LIN communication circuit | ||
| No. 1 air conditioning radiator damper servo sub-assembly | ||
| Air conditioning harness assembly | ||
| Heater radiator unit sub-assembly | ||
| Air conditioning amplifier assembly | ||
| ECM (for 1GR-FE) | ||
| ECM (for 1GD-FTV) | ||
| ECM (for 2GD-FTV) | ||
| ECM (for 2KD-FTV) | ||
| ECM (for 2TR-FE) | ||
| Temperature control: Output air is warmer or cooler than the set temperature or response is slow.* | Refrigerant volume | |
| Refrigerant pressure | ||
| Check refrigerant line | ||
| Solar sensor circuit | ||
| Room temperature sensor circuit | ||
| Ambient temperature sensor circuit | ||
| Air mix damper control servo motor circuit (front side air mix) | ||
| Air inlet damper control servo motor circuit | ||
| LIN communication circuit | ||
| No. 1 cooler expansion valve | ||
| No. 1 air conditioning radiator damper servo sub-assembly | ||
| No. 1 blower damper servo sub-assembly | ||
| Air conditioning harness assembly | ||
| Heater radiator unit sub-assembly | ||
| Air conditioning amplifier assembly | ||
| ECM (for 1GR-FE) | ||
| ECM (for 1GD-FTV) | ||
| ECM (for 2GD-FTV) | ||
| ECM (for 2KD-FTV) | ||
| ECM (for 2TR-FE) | ||
| Temperature control: No temperature control. (only Max. cool or Max. hot) | Air mix damper control servo motor circuit (front side air mix) | |
| Room temperature sensor circuit | ||
| Ambient temperature sensor circuit | ||
| Evaporator temperature sensor circuit | ||
| Solar sensor circuit | ||
| LIN communication circuit | ||
| No. 1 air conditioning radiator damper servo sub-assembly | ||
| Air conditioning harness assembly | ||
| Air conditioning amplifier assembly | ||
| No air inlet control. | Air inlet damper control servo motor circuit | |
| LIN communication circuit | ||
| No. 1 blower damper servo sub-assembly | ||
| No. 1 air conditioning radiator damper servo sub-assembly | ||
| Air conditioning harness assembly | ||
| Air conditioning amplifier assembly | ||
| No air flow mode control. | Air outlet damper control servo motor circuit | |
| Air outlet damper control servo motor circuit (w/ Rear Face Register) | ||
| LIN communication circuit | ||
| No. 1 air conditioning radiator damper servo sub-assembly | ||
| No. 2 air conditioning radiator damper servo sub-assembly (w/ Rear Face Register) | ||
| Air conditioning harness assembly | ||
| Air conditioning amplifier assembly | ||
| Engine coolant does not warm up quickly when engine is cold (PTC heater does not operate). (w/ PTC Heater) | CAN communication system (for LHD with Central Gateway ECU) | |
| CAN communication system (for LHD without Central Gateway ECU) | ||
| CAN communication system (for RHD with Central Gateway ECU) | ||
| CAN communication system (for RHD without Central Gateway ECU) | ||
| Proceed to "PTC Heater Circuit" | ||
| Viscous with magnet clutch heater assembly does not operate when heater switch assembly is pushed while engine is cold. (w/ Viscous Heater) | CAN communication system (for LHD with Central Gateway ECU) | |
| CAN communication system (for LHD without Central Gateway ECU) | ||
| Proceed to "Viscous Heater with Magnet Clutch Circuit" | ||
| Engine idle up does not occur when idle up switch is pushed while engine is cold. (w/ Idle Up Switch) | CAN communication system (for RHD with Central Gateway ECU) | |
| CAN communication system (for RHD without Central Gateway ECU) | ||
| Proceed to "Idle Up Switch Circuit" | ||
| ECO mode switch does not operate. | CAN communication system (for LHD with Central Gateway ECU) | |
| CAN communication system (for LHD without Central Gateway ECU) | ||
| CAN communication system (for RHD with Central Gateway ECU) | ||
| CAN communication system (for RHD without Central Gateway ECU) | ||
| Meter/gauge system | ||
| Air conditioning amplifier assembly | ||
| Diagnostic trouble codes (DTCs) are not recorded. Set mode is cleared when ignition switch is off. | Back-up power source circuit | |
| Air conditioning amplifier assembly |
*: Check that the radiator, condenser and intercooler are not blocked with leaves, dirt or insects, and clean them if necessary. Also check the installation condition of the hose connection, and check for corrosion, etc.
for 1GR-FE: Click here
for 1GD-FTV: Click here
for 2GD-FTV: Click here
for 2KD-FTV: Click here
for 2TR-FE: Click here