DESCRIPTION
The No. 1 cooler thermistor is installed on the evaporator in the air conditioning unit to detect the temperature of the cooled air that has passed through the evaporator and control the air conditioning. It sends appropriate signals to the No. 1 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 No. 1 air conditioning amplifier assembly 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 Code |
DTC Detection Condition |
Trouble Area |
---|---|---|
B1413/13 |
An open or short in the No. 1 cooler thermistor circuit. |
|
WIRING DIAGRAM
PROCEDURE
1. |
READ VALUE USING TECHSTREAM (NO. 1 COOLER THERMISTOR) |
(a) Use the Data List to check if the No. 1 cooler thermistor is functioning properly (See page ).
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
---|---|---|---|
Evaporator Fin Thermistor |
No. 1 cooler thermistor / Min.: -29.7°C (-21.46°F) Max.: 59.55°C (139.19°F) |
Actual evaporator temperature displayed |
Open in the circuit: -29.7°C (-21.46°F). Short in the circuit: 59.55°C (139.19°F). |
OK:
The display is as specified in the normal condition column.
Result
Result |
Proceed to |
---|---|
OK (When troubleshooting according to problem symptoms table) |
A |
OK (When troubleshooting according to the DTC) |
B |
NG |
C |
A |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
B |
REPLACE NO. 1 AIR CONDITIONING AMPLIFIER ASSEMBLY |
|
2. |
INSPECT NO. 1 COOLER THERMISTOR |
(a) Remove the No. 1 cooler thermistor (See page ). |
|
(b) 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 |
-5°C (23°F) |
5.65 to 6.95 kΩ |
|
0°C (32°F) |
4.40 to 5.35 kΩ |
|
5°C (41°F) |
3.40 to 4.15 kΩ |
|
10°C (50°F) |
2.70 to 3.25 kΩ |
|
15°C (59°F) |
2.14 to 2.58 kΩ |
|
20°C (68°F) |
1.71 to 2.05 kΩ |
|
25°C (77°F) |
1.38 to 1.64 kΩ |
|
30°C (86°F) |
1.11 to 1.32 kΩ |
*a |
Sensing Portion |
*b |
Resistance |
*c |
Allowable Range |
*d |
Temperature |
NOTICE:
HINT:
As the temperature increases, the resistance decreases (refer to the graph).
NG |
REPLACE NO. 1 COOLER THERMISTOR |
|
3. |
INSPECT NO. 1 AIR CONDITIONING AMPLIFIER ASSEMBLY |
(a) Remove the No. 1 air conditioning amplifier assembly (See page ). |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
z15-6 (TE) - 2 |
Always |
Below 1 Ω |
z15-5 (SG-3) - 1 |
Always |
Below 1 Ω |
z15-6 (TE) - Body ground |
Always |
10 kΩ or higher |
z15-5 (SG-3) - Body ground |
Always |
10 kΩ or higher |
*a |
Front view of wire harness connector (to No. 1 Cooler Thermistor) |
*b |
Front view of wire harness connector (to No. 1 Air Conditioning Amplifier Assembly) |
OK |
REPLACE NO. 1 AIR CONDITIONING AMPLIFIER ASSEMBLY |
NG |
REPLACE AIR CONDITIONING HARNESS ASSEMBLY |
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