Manual Controller Air Conditioner Check - Hyundai Tiburon 2003 Workshop Manual

AIR CONDITIONER CHECK
11V is outputted from connector A-17 terminal in turning on INSULATING and pressing air conditioner switch. However,
although 11V is outputted from FATC connector A-17 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 conditioneris 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 turnson/off switches in it according to
standard. So, it controls that output signalof 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
Symptoms
Wind of air conditioner isn't
discharged into vehicle despite
switching on air conditioner.
http://www.hmaservice.com/viewer/content.asp?IsPrint=true&imgnum=1&print_title...
Causes
Signal output error of air
conditioner
Input error of evaporator sensor
How to check
Switch on air conditioner and measure voltage
of FATC connector A-17 terminal as shown in
the above figure. If 9V and more, check triple
switch,air conditioner relay and ECM.
Switch on air conditioner and measure voltage
of FATC connector A-17 terminal as shown in
the above figure. If 1V and less, check input
value ofevaporator sensor.
If evaporator sensor is disconnected or short or
voltage of its inputsource is more than 3.0V
(below 0.5° C), output of air conditioner isn't
made.
Page 4 of 8
24.04.2008