AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System), Diagnostic DTC:B1413/13
| DTC Code | DTC Name |
|---|---|
| B1413/13 | Evaporator Temperature Sensor Circuit |
DESCRIPTION
The No. 1 cooler thermistor is installed on the evaporator in the air conditioner unit to detect the temperature of the cooled air that has passed through the evaporator and is used to control the air conditioning. It sends signals to the air conditioning amplifier assembly. The resistance of the No. 1 cooler thermistor changes in accordance with the temperature of the cooled air that has passed through the evaporator. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.
The air conditioning amplifier assembly applies voltage (5 V) to the No. 1 cooler thermistor and reads voltage changes as the resistance of the No. 1 cooler thermistor changes. This sensor is used for frost prevention.
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
Memory |
|---|---|---|---|---|
B1413/13 |
Evaporator Temperature Sensor Circuit |
Open or short in evaporator temperature sensor circuit |
|
Memorized (4 sec. or more)*1 |
*1: The air conditioning amplifier assembly stores this DTC if the malfunction has occurred for the period of time indicated in the brackets.
WIRING DIAGRAM
PROCEDURE
READ VALUE USING GTS
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Body Electrical / Air Conditioner / Data List.
Check the value(s) by referring to the table below.
Body Electrical > Air Conditioner > Data List
Tester Display
Measurement Item
Range
Normal Condition
Diagnostic Note
Evaporator Fin Thermistor
No. 1 cooler thermistor
Min.: -29.70°C (-21.46°F)
Max.: 59.55°C (139.19°F)
Actual evaporator temperature displayed
-
Body Electrical > Air Conditioner > Data List
Tester Display
Evaporator Fin Thermistor
OK
The display is as specified in the normal condition column.
Result
Result
Proceed to
NG
A
OK (When troubleshooting according to Problem Symptoms Table)
B
OK (When troubleshooting according to the DTC)
C
B PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE
INSPECT NO. 1 COOLER THERMISTOR
Disconnect the No. 1 cooler thermistor connector.
*a
Component without harness connected
(No. 1 Cooler Thermistor)
*b
Sensing Portion
*c
Resistance (kΩ)
*d
Temperature (°C (°F))
*e
Allowable Range
-
-
Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection
Condition
Specified Condition
1 - 2
-10°C (14°F)
7.30 to 9.10 kΩ
1 - 2
-5°C (23°F)
5.65 to 6.95 kΩ
1 - 2
0°C (32°F)
4.40 to 5.35 kΩ
1 - 2
5°C (41°F)
3.40 to 4.15 kΩ
1 - 2
10°C (50°F)
2.70 to 3.25 kΩ
1 - 2
15°C (59°F)
2.14 to 2.58 kΩ
1 - 2
20°C (68°F)
1.71 to 2.05 kΩ
1 - 2
25°C (77°F)
1.38 to 1.64 kΩ
1 - 2
30°C (86°F)
1.11 to 1.32 kΩ
Note:Hold the sensor only by its connector. Touching the sensing portion may change the resistance value.
When measuring, the sensor temperature must be the same as the ambient temperature.
Tip:As the temperature increases, the resistance decreases (see the graph).
Result
Proceed to
OK
NG
INSPECT AIR CONDITIONING HARNESS ASSEMBLY
-
*a
Front view of wire harness connector
(to Air Conditioning Amplifier Assembly)
Remove the air conditioning harness assembly.
Click hereClick hereClick hereClick hereClick hereClick here
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*a
Front view of wire harness connector
(to No. 1 Cooler Thermistor)
Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection
Condition
Specified Condition
z3-6 (TEA) - 2
Always
Below 1 Ω
z3-5 (SGA) - 1
Always
Below 1 Ω
Result
Proceed to
OK
NG
NG REPLACE AIR CONDITIONING HARNESS ASSEMBLY
-