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Home >> Hyundai >> 2009 >> Tucson FWD L4-2.0L >> Repair and Diagnosis >> Heating and Air Conditioning >> Control Assembly >> Service and Repair >> Heater & A/C Control Unit(Full Automatic) >> Repair procedures
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Repair procedures





Check Point By Type




1. Power supply check
2. Back light check
3. Blower check
4. Air conditioner check
5. Intake check and AQS check
6. Mode check
7. Temp check
8. Sensor check

Power Supply Check




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.
ERROR DIAGNOSTICS






Back Light Check




In turning on IG and then light switch, battery power is supplied for FATC connector A2 terminal through wiring. The supplied power passes connector A1 terminal through light LED in FATC and flows into rheostat as shown in the above figure. The brightness is adjusted according to rheostat value of restart.
Error Diagnostics






Blower Check




Perform the blower check in manual blower running state because it is difficult to check blower at automatic control. Blower is controlled from level l to level 8 equally as in button operation and running logic. In turning on IG, blower relay is ON and voltage of 0.1 to 1.4V is transferred from FATC connector A4 terminal to base source of power TR according to FATC control (selectable from level 1 to level 8). At this time, voltage of blower motor's both ends is determined according to collector voltage of FATC connector A5 terminal. If FATC is controlled in level 8, GND(0V) is supplied for FATC connector A18 terminal and high blower relay is driven.
Error Diagnostics






Air Conditioner Check




11V is outputted from connector A17 terminal in turning on INSULATING and pressing air conditioner switch. However, although 11V is outputted from FATC connector A17 terminal, compressor clutch isn't driven. Wind of air conditioner is discharged if only compressor clutch works. Output signal from air conditioner is inputted in engine computer through triple switch. Then, the engine computer considers several conditions and when output of air conditioner is judged to be practical, it gives GND to signal terminal of air conditioner relay. Accordingly, relay of air conditioner is ON and compressor clutch works. Triple switch checks pressure of refrigerant flowing through pipe and turns on/off switches in it according to standard. So, it controls that output signal of air conditioner outputted from FATC is inputted into engine computer, and also speed of condenser fan according to pressure level. (For high pressure, high-speed and for low pressure, low-speed.)
Error Diagnostics






Intake And Aqs Check




In turning on IG and selecting indoor mode with indoor switch, 0V is outputted from FATC connector A23 terminal, 12V is supplied for A10 terminal and motor works in direction of outdoor. In selecting outdoor mode with indoor switch, 0V is outputted from FATC connector A10 terminal, 12V is supplied for A23 terminal and motor works in direction of indoor.
Error Diagnostics






Mode Check




In turning on IG and selecting mode switch, sequential operation begins in order of Vent -> Bi-level -> Blower -> Mix. DIP mode works regardless of order at selecting it. As shown in the above figure, in adjusting mode switch from VENT to DEF, 12V is outputted from connector B4, 0V is supplied for B5 and mode motor works in direction of DEF. In adjusting mode switch from DEF to VENT, 12V is outputted from connector B5, 0V is supplied for B4 and mode motor works in direction of VENT. When mode actuator has to move to a certain location for its automatic control, mode feedback signal terminal moves equally in mode actuator and informs controller of location of mode actuator through mode connector B6. Comparing original value with the inputted value, it works until they are same.
Error Diagnostics






Temp Check




In adjusting temp switch from 32°C to 17°C, 0V is outputted from FATC connector A22 terminal, 12V is supplied for A9 terminal and temp motor works in direction of COOL. In adjusting temp switch from 17°C to 32°C, 0V is outputted from FATC connector A9 terminal, 12V is supplied for A22 terminal and temp motor works in direction of WARM. When temp actuator has to move to a certain location for its automatic control, temp feedback signal terminal moves equally in temp actuator and informs controller of location of temp actuator through FATC connector B10 terminal. Comparing original value with inputted value, it works until they are same. If 4.9V and more is inputted in B10 terminal, it is regarded as disconnection. If 0.1V and less is inputted in B10 terminal, it is regarded as short-circuit. In the case of disconnection or short-circuit as a result of self-diagnostic, substitute control is carried out as follows.
- If setup temperature is 17°C to 24.5°C, set to MACOOL.
- If setup temperature is 25°C to 32.0°C, set to MAWARM.
Error Diagnostics






Sensor Check




Resistance value set according to temperature of each part is inputted in FATC controller.
Internal temperature of vehicle is automatically controlled by operating the inputted values.
It is recommended to refer to resistance value and voltage value corresponding to each temperature and the following explains essential functions of each sensor required for repair and self-diagnostics and substitute functions at disconnection or short-circuit.
- If 4.9V and more is inputted in connectors B1, B3, B4, B7, B12 terminal, it is regarded as disconnection.
- If 0.1V and less is inputted in connectors B1, B3, B4, B7, B12 terminal, it is regarded as short-circuit.
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