
FULL-AUTOMATIC AIR CONDITIONER –
Troubleshooting
55-34
TROUBLESHOOTING
STANDARD FLOW OF DIAGNOSTIC TROUBLESHOOTING
Refer to GROUP 00 – How to Use Troubleshooting/Inspection Service Points.
DIAGNOSIS FUNCTION
DIAGNOSIS CODES CHECK
Connect the MUT-
II
or a voltmeter to the diagnosis connector (16-pin), then check diagnosis codes.
(Refer to GROUP 00 – How to Use Troubleshooting/Inspection Service Points.)
ERASING DIAGNOSIS CODES
Refer to GROUP 00 – How to Use Troubleshooting/Inspection Service Points.
INSPECTION CHART FOR DIAGNOSIS CODES
Code No.
Diagnosis item
Reference
page
11
Inside air temperature sensor system (open circuit)
55-34
12
Inside air temperature sensor system (short circuit)
55-34
13
Outside air temperature sensor system (open circuit)
55-35
14
Outside air temperature sensor system (short circuit)
55-35
15
Heater water temperature sensor system (open circuit)
55-36
16
Heater water temperature sensor system (short circuit)
55-36
21
Air thermo sensor system (open circuit)
55-37
22
Air thermo sensor system (short circuit)
55-37
31
Potentiometer system of air mix damper assembly
55-38
32
Potentiometer system of air outlet changeover damper assembly
55-39
41
Drive system of air mix damper motor assembly
55-40
42
Drive system of air outlet changeover damper motor assembly
55-40
INSPECTION PROCEDURES FOR DIAGNOSIS CODES
Code No.11 Inside air temperature sensor system (open
circuit)
Probable cause
This diagnosis code is output if the power supply line or input line of the inside
air temperature sensor inside A/C-ECU is open-circuited and no signal is input
from the inside air temperature sensor to A/C-ECU.
D
Malfunction of the A/C-ECU
Replace the A/C-ECU.
Code No.12 Inside air temperature sensor system (short
circuit)
Probable cause
This diagnosis code is output if the power supply line or input line of the inside
air temperature sensor inside A/C-ECU is short-circuited and inside air
temperature sensor power supply voltage signals are input to A/C-ECU.
D
Malfunction of the A/C-ECU
Replace the A/C-ECU.