AC–20 AIR CONDITIONING SYSTEM – TROUBLESHOOTING SENSOR CHECK TROUBLE CODE CHART If a LED is blinking during the diagnostic sensor check, check the circuit listed for the code in the table below (Proceed to the page given for that circuit.) No. | Blinking LED | Detecting Condition 0 | L–AUTO | • Normal 1 | L–FACE*1 | • Open or short in room temperature sensor circuit. 2 | L–B/L | • Open or short in ambient temperature sensor circuit. 3 | L–FOOT | • Open or short in evaporator temperature sensor circuit. 4 | L–F/D*2 | • Open or short in engine coolant temperature sensor circuit. 5 | L–DEF*3 | • Open in solar sensor circuit. | • Short in solar sensor circuit. 6 | L–A/C*4 | • All conditions below are detected for 3 secs. or more. (a) Engine speed 450 rpm or more. (b) Ratio between engine and compressor rpm deviates 20% or more in comparison to normal operation. 7 | L–FRS | • Open in pressure sensor circuit. | • Abnormal refrigerant pressure [ below 196 kPa (2.0 kgf/cm2, 28 psi) over 3,140 kPa (32.0 kgf/cm2, 455 psi) ] 8 | L–REC | • Short to ground or power source circuit in air mix damper position sensor circuit. 9 | L–LO | • Short to ground or power source circuit in air outlet damper position sensor circuit. 10 | L–M2 | • Air mix damper position sensor value does not change even if A/C amplifier signals the air mix damper control servo motor to operate. 11 | L–HI | • Air outlet damper position sensor value does not change even if A/C amplifier signals the air outlet damper control servo motor to operate. HINT: *1 If the room temp. is approx. –20°C (–4°F) or lower, FACE light may blink even though the system is normal. *2 If the ambient temperature is approx. –50°C (–58°F) or lower, the B/L light may blink even though the system is normal. *3 If the check is being performed in a dark place, the LED for DEF (solar sensor circuit abnormal) could be blinking. In this case, perform diagnostic sensor check again while shining a light, such as an inspection light, on the solar sensor. If the light is still blinking, there could be trouble in the solar sensor circuit.