AIR CONDITIONING SYSTEM (for Automatic 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 the air conditioning system do not operate | Proceed to "IG Power Source Circuit" | |
| Integration panel sub-assembly | ||
| No. 1 cooler wire | ||
| Air conditioning amplifier assembly | ||
| Air Flow Control: No blower operation | Indicator check | |
| Integration panel sub-assembly | ||
| No. 1 cooler wire | ||
| Proceed to "Heater Relay Circuit" | ||
| Proceed to "Blower Motor Circuit" | ||
| Air conditioning amplifier assembly | ||
| Air Flow Control: No blower control | Indicator check | |
| Integration panel sub-assembly | ||
| No. 1 cooler wire | ||
| Proceed to "Blower Motor Circuit" | ||
| Air conditioning amplifier assembly | ||
| Air Flow Control: Insufficient air flow | Proceed to "Blower Motor Circuit" | |
| Temperature Control: No cool air comes out | Indicator check | |
| Integration panel sub-assembly | ||
| No. 1 cooler wire | ||
| Check volume of refrigerant | ||
| Check for refrigerant gas leak | ||
| Proceed to "Pressure Switch Circuit" | ||
| Proceed to "Air Conditioning Compressor Magnetic Clutch Circuit" | ||
| Proceed to "Air Mix Damper Control Servo Motor Circuit (Passenger Side)" | ||
| Proceed to "Ambient Temperature Sensor Circuit" | ||
| Proceed to "Evaporator Temperature Sensor Circuit" | ||
| Proceed to "Room Temperature Sensor Circuit" | ||
| Proceed to "Solar Sensor Circuit" | ||
| Proceed to "Vehicle Speed Signal Circuit" | ||
| Air conditioning amplifier assembly | ||
| Cooler expansion valve | ||
| Temperature Control: No warm air comes out | Indicator check | |
| Integration panel sub-assembly | ||
| No. 1 cooler wire | ||
| Proceed to "Air Mix Damper Control Servo Motor Circuit (Passenger Side)" | ||
| Proceed to "Ambient Temperature Sensor Circuit" | ||
| Proceed to "Evaporator Temperature Sensor Circuit" | ||
| Proceed to "Room Temperature Sensor Circuit" | ||
| Proceed to "Solar Sensor Circuit" | ||
| Proceed to "Engine Coolant Temperature Communication Circuit" | ||
| Proceed to "Vehicle Speed Signal Circuit" | ||
| Air conditioning amplifier assembly | ||
| Heater radiator unit sub-assembly | ||
| Temperature Control: Output air is warmer or cooler than set temperature or response is slow | Indicator check | |
| Integration panel sub-assembly | ||
| No. 1 cooler wire | ||
| Check volume of refrigerant | ||
| Check for refrigerant gas leak | ||
| Proceed to "Pressure Switch Circuit" | ||
| Proceed to "Air Conditioning Compressor Magnetic Clutch Circuit" | ||
| Proceed to "Air Mix Damper Control Servo Motor Circuit (Passenger Side)" | ||
| Proceed to "Ambient Temperature Sensor Circuit" | ||
| Proceed to "Evaporator Temperature Sensor Circuit" | ||
| Proceed to "Room Temperature Sensor Circuit" | ||
| Proceed to "Solar Sensor Circuit" | ||
| Proceed to "Engine Coolant Temperature Communication Circuit" | ||
| Proceed to "Vehicle Speed Signal Circuit" | ||
| Air conditioning amplifier assembly | ||
| Cooler expansion valve | ||
| Heater radiator unit sub-assembly | ||
| Temperature Control: No temperature control (only MAX COOL or MAX WARM) | Indicator check | |
| Integration panel sub-assembly | ||
| No. 1 cooler wire | ||
| Proceed to "Air Mix Damper Control Servo Motor Circuit (Passenger Side)" | ||
| Proceed to "Ambient Temperature Sensor Circuit" | ||
| Proceed to "Evaporator Temperature Sensor Circuit" | ||
| Proceed to "Room Temperature Sensor Circuit" | ||
| Proceed to "Solar Sensor Circuit" | ||
| Proceed to "Vehicle Speed Signal Circuit" | ||
| Air conditioning amplifier assembly | ||
| No air inlet control | Proceed to "Air Inlet Damper Control Servo Motor Circuit" | |
| Air conditioning amplifier assembly | ||
| No air flow mode control | Proceed to "Air Outlet Damper Control Servo Motor Circuit" | |
| Air conditioning amplifier assembly | ||
| Engine idle up does not occur or is continuous | Proceed to "Air Conditioning Compressor Magnetic Clutch Circuit" | |
| Air conditioning amplifier assembly | ||
| Proceed to "SFI System (for 2TR-FE)" | ||
| Proceed to "SFI System (for 1GR-FE)" | ||
| Diagnostic trouble codes are not stored, and set mode is cleared when ignition switch is off | Proceed to "Back-up Power Source Circuit" | |
| Air conditioning amplifier assembly |
| Symptom | Suspected Area | See page |
|---|---|---|
| All functions of rear cooler do not operate | Rear cooler relay | |
| Rear cooler switch | - | |
| Cooler control switch assembly | ||
| Rear blower register | ||
| Rear blower with fan motor sub-assembly | ||
| Harness or connector | - | |
| Air Flow Control: No blower operation | Rear cooler switch | - |
| Cooler control switch assembly | ||
| Rear blower register | ||
| Rear blower with fan motor sub-assembly | ||
| Harness or connector | - | |
| Air Flow Control: No blower control | Cooler control switch assembly | |
| Rear blower register | - | |
| Rear blower with fan motor sub-assembly | ||
| Harness or connector | - | |
| Temperature Control: No cool air comes out | Rear cooler switch | - |
| Cooler control switch assembly | ||
| Harness or connector | - | |
| Rear evaporator sub-assembly |