Tech Tips
Use the table below to help determine the causes of the problem symptom. 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 the A/C system do not operate. | IG power source circuit | |
| Air conditioning amplifier assembly | ||
| Air Flow Control: No blower operation. | Blower motor circuit | |
| Air conditioning amplifier assembly | ||
| Air Flow Control: No blower control. | Blower motor circuit | |
| Air conditioning amplifier assembly | ||
| Air Flow Control: Insufficient air flow. | Blower motor circuit | |
| Air conditioning amplifier assembly | ||
| Temperature Control: less cool air comes out. | Refrigerant shortage check using the intelligent tester | |
| Refrigerant pressure | ||
| Expansion valve | - | |
| Compressor and pulley (for 1ND-TV) | ||
| Compressor and pulley (for 1NR-FE) | ||
| Compressor and pulley (for 1NZ-FE) | ||
| Air conditioning amplifier assembly | ||
| Temperature Control: No cool air comes out. | Refrigerant volume | |
| Refrigerant pressure | ||
| Compressor solenoid circuit | ||
| Evaporator temperature sensor circuit | ||
| Ambient temperature sensor circuit | ||
| Heater control switch circuit | ||
| Air mix damper control cable | - | |
| Expansion valve | - | |
| Temperature Control: No warm air comes out. | Evaporator temperature sensor circuit | |
| Ambient temperature sensor circuit | ||
| Engine coolant temperature sensor circuit (for 1ND-TV) | ||
| Engine coolant temperature sensor circuit (for 1NR-FE) | ||
| Engine coolant temperature sensor circuit (for 1NZ-FE) | ||
| CAN communication system | ||
| PTC heater circuit* | ||
| Headlight signal circuit* | ||
| No. 3 heater control (Max hot switch) | - | |
| Air mix damper control cable | - | |
| Air conditioning amplifier assembly | ||
| ECM (for 1ND-TV) | ||
| ECM (for 1NR-FE) | ||
| ECM (for 1NZ-FE) | ||
| Harness or connector | - | |
| Temperature Control: Output air is warmer or cooler than the set temperature or response is slow. | Refrigerant volume | |
| Refrigerant pressure | ||
| Ambient temperature sensor circuit | ||
| Engine coolant temperature sensor circuit (for 1ND-TV) | ||
| Engine coolant temperature sensor circuit (for 1NR-FE) | ||
| Engine coolant temperature sensor circuit (for 1NZ-FE) | ||
| CAN communication system | ||
| Air mix damper control cable | - | |
| Radiator unit sub-assembly | - | |
| Expansion valve | - | |
| Air conditioning amplifier assembly | ||
| ECM (for 1ND-TV) | ||
| ECM (for 1NR-FE) | ||
| ECM (for 1NZ-FE) | ||
| Temperature Control: No temperature control (only Max. cool or Max. hot) | Ambient temperature sensor circuit*1 | |
| Evaporator temperature sensor circuit | ||
| Heater control switch circuit | ||
| Engine coolant temperature sensor circuit (for 1ND-TV) | ||
| Engine coolant temperature sensor circuit (for 1NR-FE) | ||
| Engine coolant temperature sensor circuit (for 1NZ-FE) | ||
| CAN communication system | ||
| Air mix damper control cable | - | |
| Air conditioning amplifier assembly | ||
| ECM (for 1ND-TV) | ||
| ECM (for 1NR-FE) | ||
| ECM (for 1NZ-FE) | ||
| No air inlet control. | Air inlet damper control cable | - |
| No air flow mode control. | Defroster damper control cable | - |
| Engine idle speed increase does not occur, or is continuous | Compressor solenoid circuit | |
| Air conditioning amplifier assembly | ||
| ECM (for 1ND-TV) | ||
| ECM (for 1NR-FE) | ||
| ECM (for 1NZ-FE) | ||
| CAN communication system | ||
| A/C indicator blinking. | Compressor solenoid circuit |
*: w/ Quick Heater Assembly