CONTROL SPECIFICATION
| Control item | Control features | Remarks | |
|---|---|---|---|
| Required discharge temperature | Required temperature determined by the set temperature and the inputted sensor value. | ||
| Auto control | Required discharge temperature is determined by the set temperature and the inputted sensor value. The feature will use the required discharge temperature to perform the auto control of temp. actuator, mode actuator, intake actuator, blower motor and compressor, and maintain the set temperature stably. | ||
| IN-CAR temperature correction | Upon detecting rapid changes of temperature from the IN CAR sensor, it will gradually correct the In Car temperature value. | 0.5°C UP/sec. 0.5°C DOWN/sec. | |
| AMB temperature correction | Upon detecting rapid changes of temperature from the AMB sensor, it will gradually correct the ambient temperature value. | Logic of the correction speed sensor | |
| Photo correction | Upon detecting rapid changes of photo intensity from the PHOTO sensor, it will gradually correct the photo intensity value. | 0 --> 1000 (W/m 2 )/1 min delay 1000 --> 0 (W/m 2 )/5min delay | |
| TEMP door control | It does the automatic control to maintain the optimum TEMP door opening (0%-100%). It will be computed by the temperature set and the input signal from each sensor. | The set temperature range LO --> HI, 0.5°C step (LO --> HI, 1°F step) | |
| Blower speed | Automatic control of the blower speed. The target value will be computed by the set temperature and the input signal from each sensor. (8 levels may be selected in case of manual selection.) | Auto mode blower low voltage (Manual low voltage: 3.8) Auto mode heater blower HI speed: 10.6V | |
| Electro-motive mode control | During auto control, it will raise the permitted voltage of blower motor gradually in order to improve comfortably. | 12 seconds for shifting LO -->MAX HI | |
| Photo compensation | During auto control, it will compensate the blower level and the discharge temperature according to the photo intensity detected from the PHOTO sensor. PHOTO compensation will begin after 5 seconds when ignition on. | ||
| Mode door control | Automatic control of air discharge based on the required discharge temperature. It will be computed by the temperature setting and the input signal from each sensor. (VENT <==> B/L<==> FLOOR) In case of manual selection (VENT --> B/L --> FLOOR --> MIX --> VENT) | At OFF, MODE door will fix the current condition. At OFF in manual mode, MODE door will maintain the manual control condition. | |
| INTAKE door control | Auto control of intake mode based on the required discharge temperature that will be computed by the temperature setting and the input signal from each sensor. | Shift to REC when selecting REC button at FRE condition (LED on). Shift to FRE when selecting FRE button at REC condition (LED off). | |
| INTAKE control at OFF | The intake door will fix to the FRE. position when switching the system off. | FRE./REC. manual selection will be enabled at OFF REC indicator will come out at OFF. | |
| Compressor auto control | Control automatically the compressor on/off state corresponding to the set temperature and the input signal from each sensor. | When selecting the AUTO SW, the compressor is controlled to ON/OFF. When selecting the DEF SW, the compressor is controlled to "ON". | |
| Compressor clutch on/off control based on refrigerant temperature | If EVAP sensor temperature is below 0.5°C, the compressor will be ON and the temperature is 2.5°C, or higher, with the compressor OFF. | ||
| MAX HOT | When selecting the set temperature HI at AUTO mode, MAX HOT will be performed. It will prevail over MIX mode control. | TEMP door: MAX HOT MODE door: FLOOR mode INTAKE door: FRE mode Compressor: OFF Blower speed: AUTO HI (10.6V) | |
| MAX COOL | When selecting the set temperature LO at AUTO mode, MAX COOL will be performed. | TEMP door: MAX COOL MODE door: FLOOR mode INTAKE door: REC mode Compressor: ON Blower speed: MAX HI | |
| Electromotive heating control | If the water temperature is 40°C or more at B/L or FLOOR in AUTO mode, it will effect the electromotive heating control to prevent outside cold air from flowing toward the feet of passengers. | Blower speed: Controlled at AUTO LOW (4.5V) | |
| As the coolant temperature rises, the MODE door will shift to DEF --> MIX --> AUTO. | Operation release Water temp. "GREATER THAN EQUAL TO" 60°C Max cool In pressing MODE switch. In pressing DEF switch. | ||
| MODE: Manual selection is enabled. INTAKE door: At AUTO control or at manual selection mode. | |||
| Blower speed: Manual selection is enabled (No re-entry). | |||
| Electromotive cooling control | In order to prevent hot air from the VENT or B/L in AUTO mode (A/C on mode blower auto), the blower speed will be operated at LOW for approx. 12 seconds before entering the AUTO control if the EVAP sensor detection is temperature 30°C or higher. | ||
| MAX HOT | If the above condition is satisfied, electromotive cooling control will operate at any time. | ||
| Air Quality System (AQS) | The AQS system will detect the hazardous elements and odors contained in the air. If the harmful element concentration is higher than standard, the system will output a LOW signal (1.0V or less) to the FATC. | When the initial battery connection and ignition is ON, it will operate at AUTO mode. (AQS will not operate.) | |
| If the concentration is within the standard value, the system will output a HI signal (4V) to the FATC. | When IGN 2 ON, the AQS assembly will be preheated for 34.5+/-5seconds. | ||
| Corresponding to the signal from the AQS, it will control the INTAKE door as follows to prevent the inflow of harmful gas in FATC | IGN2 ON: It will check circuit break on the AQS assembly's signal line for approx. 7 seconds during the preheating, irrespective to the AQS switch condition. | ||
| Condition | INTAKE door position | When AQS is selected prior to IGN2 OFF and IGN2 is turned OFF --> ON: AQS indicator will come on, and the system will operate at AQS mode. (Store the previous condition before IGN 2 OFF) | |
| LOW | REC | ||
| HI | FRE | ||
| Initialization Upon battery-on | When supplying the initial power, it will operate in the initial condition. | When the initial ignition ON after battery connection, the system will operate at the set temperature 23°C (73°F) and at AUTO mode. | |
| Memory | When removing ignition key, it will store FATC'S operating condition. | When IGN ON after IGN OFF during FATC operation, the system will operate at the previous before the ignition off. | |
CONTROL SPECIFICATIONS
Scheme 1
Since FATC controller is complicated in function as shown in the above chart, it may be difficult to conclude its reason at the occurrence of failure. For this reason, follow the diagnostic procedures which follow.
- Power supply check
- Back light check
- Blower check
- Air conditioner check
- Intake check and AQS check
- Mode check
- Temp check
- Sensor check
Scheme 2
In turning off IGN, battery supplies power for ordinary power, FATC connector A3 through battery fuse. FATC performs memory function by means of battery power supplied as described above. In turning on IGN, alternator is driven. At this time, IG2 power generated in alternator FATC connector A12 and A25 terminal through IG2 fuse and air conditioner fuse 10A. FAT carried out actual system operation by means of IG2 power supplied as described above.