DESCRIPTION
The No. 1 cooler thermistor (evaporator temperature sensor) is installed to the evaporator in the air conditioner unit to detect the temperature of the cooled air that has passed through the evaporator, which is used to control the air conditioning system. It sends signals to the air conditioning amplifier assembly. The resistance of the No. 1 cooler thermistor (evaporator temperature sensor) 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 (evaporator temperature sensor) and reads voltage changes as the resistance of the No. 1 cooler thermistor (evaporator temperature sensor) changes. This sensor is used for frost prevention.
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
Memory |
---|---|---|---|---|
B1413 |
Evaporator Temperature Sensor Circuit |
Any of the following conditions is met:
|
|
Memorized (4 seconds or more)* |
Vehicle Condition |
|||
---|---|---|---|
Pattern 1 |
Pattern 2 |
||
Diagnosis Condition |
Ignition switch ON |
○ |
○ |
Malfunction Status |
Open in No. 1 cooler thermistor (evaporator temperature sensor) circuit |
○ |
- |
Short in No. 1 cooler thermistor (evaporator temperature sensor) circuit |
- |
○ |
|
Detection Time |
4 seconds or more |
4 seconds or more |
|
Number of Trips |
1 trip |
1 trip |
HINT:
DTC will be output when conditions for either of the patterns in the table above are met.
WIRING DIAGRAM
PROCEDURE
1. |
READ VALUE USING TECHSTREAM (EVAPORATOR FIN THERMISTOR) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Air Conditioner / Data List.
(e) Read the Data List according to the display on the Techstream.
Body Electrical > Air Conditioner > Data List
Tester Display |
Measurement Item |
Range |
Normal Condition |
Diagnostic Note |
---|---|---|---|---|
Evaporator Fin Thermistor |
No. 1 cooler thermistor (evaporator temperature sensor) |
Min.: -29.70°C (-21.46°F) Max.: 59.55°C (139.19°F) |
Actual evaporator temperature displayed |
- |
Tester Display |
---|
Evaporator Fin Thermistor |
OK:
The display is as specified in the normal condition column.
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 |
C | ![]() |
GO TO STEP 4 |
|
2. |
INSPECT NO. 1 COOLER THERMISTOR (EVAPORATOR TEMPERATURE SENSOR) |
(a) Remove the No. 1 cooler thermistor (evaporator temperature sensor).
Click here
(b) Inspect the No. 1 cooler thermistor (evaporator temperature sensor).
Click here
NG | ![]() |
REPLACE NO. 1 COOLER THERMISTOR (EVAPORATOR TEMPERATURE SENSOR) |
|
3. |
INSPECT AIR CONDITIONING HARNESS ASSEMBLY (HEATER RADIATOR UNIT SUB-ASSEMBLY) |
(a) Remove the air conditioning harness assembly (heater radiator unit sub-assembly)
Click here
(b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
OK | ![]() |
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
NG | ![]() |
REPLACE AIR CONDITIONING HARNESS ASSEMBLY (HEATER RADIATOR UNIT SUB-ASSEMBLY) |
4. |
CHECK FOR DTC |
(a) Clear the DTCs.
Click here
(b) Check for DTCs.
Click here
Result |
Proceed to |
---|---|
DTCs are not output |
A |
DTCs are output |
B |
A | ![]() |
USE SIMULATION METHOD TO CHECK |
B | ![]() |
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
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