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 air conditioning system do not operate. | Harness or connector | - |
| Air conditioning control assembly | ||
| Air conditioning amplifier assembly | ||
| Air flow control: No blower operation. (blower motor does not operate) | Harness or connector | - |
| Blower resistor | ||
| Air conditioning control assembly | ||
| Blower with fan motor sub-assembly | ||
| Air flow control: No blower control. (blower motor does not change speed) | Harness or connector | - |
| Blower resistor | ||
| Air conditioning control assembly | ||
| Air flow control: Insufficient air comes out. | Harness or connector | - |
| Blower resistor | ||
| Air conditioning control assembly | ||
| Blower with fan motor sub-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) | ||
| Compressor assembly with magnet clutch (for 5L-E) | ||
| Magnet clutch assembly (for 1GR-FE) | ||
| Magnet clutch assembly (for 1GD-FTV, 2GD-FTV) | ||
| Magnet clutch assembly (for 2KD-FTV) | ||
| Magnet clutch assembly (for 2TR-FE) | ||
| Magnet clutch assembly (for 5L-E) | ||
| Air conditioning amplifier assembly | ||
| Temperature control: No cool air comes out.* | Refrigerant volume | |
| Refrigerant pressure | ||
| Check refrigerant line | ||
| Air conditioner pressure switch | ||
| Harness or connector | - | |
| Evaporator temperature sensor circuit (w/ PTC Heater) | ||
| No. 1 cooler thermistor (front evaporator temperature sensor) (w/o PTC Heater) | ||
| Air conditioning compressor magnetic clutch circuit | ||
| Air conditioning control assembly | ||
| 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) | ||
| Compressor assembly with magnet clutch (for 5L-E) | ||
| Air mix damper control sub-assembly | ||
| Defroster damper control sub-assembly | ||
| Air conditioning amplifier assembly | ||
| ECM (for 1GR-FE) | ||
| ECM (for 2TR-FE) | ||
| ECM (for 1GD-FTV) | ||
| ECM (for 2GD-FTV) | ||
| ECM (for 1KD-FTV) | ||
| ECM (for 2KD-FTV) | ||
| ECM (for 5L-E) | ||
| No. 1 cooler expansion valve | ||
| No. 1 cooler evaporator | ||
| Temperature control: No warm air comes out. | Harness or connector | - |
| Ambient temperature sensor circuit (w/ PTC Heater) | ||
| Air conditioning control assembly | ||
| Air mix damper control sub-assembly | ||
| Defroster damper control sub-assembly | ||
| Heater radiator unit sub-assembly | ||
| Temperature control: Output air is warmer or cooler than set temperature or response is slow.* | Refrigerant volume | |
| Refrigerant pressure | ||
| Check refrigerant line | ||
| Air conditioner pressure switch | ||
| Harness or connector | - | |
| Evaporator temperature sensor circuit (w/ PTC Heater) | ||
| No. 1 cooler thermistor (front evaporator temperature sensor) (w/o PTC Heater) | ||
| Air conditioning compressor magnetic clutch circuit | ||
| Air conditioning control assembly | ||
| Air mix damper control sub-assembly | ||
| Defroster damper control sub-assembly | ||
| Air conditioning amplifier assembly | ||
| ECM (for 1GR-FE) | ||
| ECM (for 2TR-FE) | ||
| ECM (for 1GD-FTV) | ||
| ECM (for 2GD-FTV) | ||
| ECM (for 1KD-FTV) | ||
| ECM (for 2KD-FTV) | ||
| ECM (for 5L-E) | ||
| No. 1 cooler expansion valve | ||
| No. 1 cooler evaporator | ||
| Temperature control: No temperature control. | Air conditioning control assembly | |
| No air inlet control. | Air conditioning control 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. | Air conditioning amplifier assembly |
*: Check that the radiator, condenser and/or intercooler is not blocked with leaves, dirt or insects, and clean them if necessary. Also check the hose connection for the installation condition, corrosion, etc.
for 1GR-FE: Click here
for 1GD-FTV: Click here
for 2GD-FTV: Click here
for 2KD-FTV: Click here
for 1TR-FE: Click here
for 2TR-FE: Click here
for 5L-E: Click here