AIR CONDITIONING SYSTEM (for Manual Air Conditioning System) PROBLEM SYMPTOMS TABLE
Tech Tips
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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.
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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 | |
| Check for refrigerant gas leak | ||
| Replace cooler expansion valve | ||
| Check cooler compressor assembly (for 2TR-FE) | ||
| Check cooler compressor assembly (for 1GR-FE) | ||
| Check cooler compressor assembly (for 5L-E) | ||
| Check cooler compressor assembly (for 1KD-FTV) | ||
| Proceed to "Pressure Sensor Circuit" | ||
| Check No. 1 pressure switch*1 | ||
| Proceed to "Air Conditioning Compressor Magnetic Clutch Circuit" | ||
| Proceed to "Compressor Lock Sensor Circuit"*2 | ||
| Proceed to "Air Mix Damper Control Servo Motor Circuit" | ||
| Proceed to "Ambient Temperature Sensor Circuit" | ||
| Proceed to "Evaporator Temperature Sensor Circuit" | ||
| Proceed to "Communication Malfunction (Bus Ic)" | ||
| Proceed to "Air Conditioning Control Panel Circuit" | ||
| 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" | ||
| Proceed to "Communication Malfunction (Bus Ic)" | ||
| 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 | |
| Check for refrigerant gas leak | ||
| Replace cooler expansion valve | ||
| Check cooler compressor assembly (for 2TR-FE) | ||
| Check cooler compressor assembly (for 1GR-FE) | ||
| Check cooler compressor assembly (for 5L-E) | ||
| Check cooler compressor assembly (for 1KD-FTV) | ||
| Replace heater radiator unit sub-assembly | ||
| Proceed to "Pressure Sensor Circuit" | ||
| Check No. 1 pressure switch*1 | ||
| Proceed to "Air Conditioning Compressor Magnetic Clutch Circuit" | ||
| Proceed to "Compressor Lock Sensor Circuit"*2 | ||
| Proceed to "Air Mix Damper Control Servo Motor Circuit" | ||
| Proceed to "Air Inlet Damper Control Servo Motor Circuit" | ||
| Proceed to "Ambient Temperature Sensor Circuit" | ||
| Proceed to "Evaporator Temperature Sensor Circuit" | ||
| Proceed to "Communication Malfunction (Bus Ic)" | ||
| Proceed to "Air Conditioning Control Panel Circuit" | ||
| Replace air conditioning amplifier assembly | ||
| LIN communication system | ||
| No air inlet control | Proceed to "Communication Malfunction (Bus Ic)" | |
| Proceed to "Air Inlet Damper Control Servo Motor Circuit" | ||
| Replace air conditioning amplifier assembly | ||
| No air flow mode control | Proceed to "Communication Malfunction (Bus Ic)" | |
| Proceed to "Air Outlet Damper Control Servo Motor Circuit" | ||
| Replace air conditioning amplifier assembly | ||
| Engine idle up does not occur when idle up switch is pushed while engine is cold*3 | 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 5L-E) | ||
| Replace ECM (for 1KD-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 |
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*1: except 1KD-FTV and w/o Rear Air Conditioning System
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*2: except 5L-E
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*3: 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 "Evaporator Temperature Circuit" | |
| Proceed to "Air Mix Damper Control Servo Motor Circuit (Rear)" | ||
| Proceed to "Rear Air Conditioning Control Panel Circuit" | ||
| Replace air conditioning amplifier assembly | ||
| LIN communication system | ||
| Temperature Control: No warm air comes out | Proceed to "Air Mix Damper Control Servo Motor Circuit (Rear)" | |
| Proceed to "Rear Air Conditioning Control Panel Circuit" | ||
| 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 "Air Mix Damper Control Servo Motor Circuit (Rear)" | |
| Proceed to "Evaporator Temperature Circuit" | ||
| Proceed to "Rear Air Conditioning Control Panel Circuit" | ||
| Replace air conditioning amplifier assembly | ||
| LIN communication system | ||
| No air flow mode control | Proceed to "Air Outlet Damper Control Servo Motor Circuit (Rear)" | |
| Proceed to "Rear Air Conditioning Control Panel Circuit" | ||
| 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 |