
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.