DESCRIPTION
The evaporator temperature sensor is installed on the evaporator in the air conditioning unit to detect the cooled air temperature that has passed through the evaporator and to control the air conditioning. It sends appropriate signals to the A/C amplifier. The resistance of the evaporator temperature sensor changes in accordance with the cooled air temperature that has passed through the evaporator. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.
The A/C amplifier applies voltage (5 V) to the evaporator temperature sensor and reads voltage changes as the resistance of the evaporator temperature sensor changes. This sensor is used for frost prevention.
DTC No. |
DTC Detection Condition |
Trouble Area |
---|---|---|
B1413/13 |
Open or short in evaporator temperature sensor circuit |
|
WIRING DIAGRAM
PROCEDURE
1. |
READ VALUE USING TECHSTREAM |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body / Air Conditioner / Data List.
(e) Check the value(s) by referring to the table below.
Air Conditioner
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
---|---|---|---|
Evaporator Fin Thermistor |
Evaporator temperature sensor / Min.: -30°C (-22°F) Max.: 59.6°C (139.28°F) |
Actual evaporator temperature displayed |
- |
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 | ![]() |
REPLACE A/C AMPLIFIER |
|
2. |
INSPECT EVAPORATOR TEMPERATURE SENSOR |
(a) Remove the evaporator temperature sensor.
(b) Disconnect the evaporator temperature sensor connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
e2-1 - e2-2 |
-10°C (14°F) |
7.30 to 9.10 kΩ |
e2-1 - e2-2 |
-5°C (23°F) |
5.65 to 6.95 kΩ |
e2-1 - e2-2 |
0°C (32°F) |
4.40 to 5.35 kΩ |
e2-1 - e2-2 |
5°C (41°F) |
3.40 to 4.15 kΩ |
e2-1 - e2-2 |
10°C (50°F) |
2.70 to 3.25 kΩ |
e2-1 - e2-2 |
15°C (59°F) |
2.14 to 2.58 kΩ |
e2-1 - e2-2 |
20°C (68°F) |
1.71 to 2.05 kΩ |
e2-1 - e2-2 |
25°C (77°F) |
1.38 to 1.64 kΩ |
e2-1 - e2-2 |
30°C (86°F) |
1.11 to 1.32 kΩ |
NOTICE:
HINT:
As the temperature increases, the resistance decreases (see the graph).
Text in Illustration
*1 |
Component without harness connected (Evaporator Temperature Sensor) |
*2 |
Sensing Portion |
NG | ![]() |
REPLACE EVAPORATOR TEMPERATURE SENSOR |
|
3. |
INSPECT AIR CONDITIONING HARNESS (A/C AMPLIFIER - EVAPORATOR TEMPERATURE SENSOR) |
(a) Remove the air conditioning harness. |
|
(b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
OK | ![]() |
REPLACE A/C AMPLIFIER |
NG | ![]() |
REPLACE AIR CONDITIONING HARNESS |
Tire Pressure Warning Light Circuit
DESCRIPTION
If the tire pressure warning ECU detects a malfunction, the tire pressure warning
light blinks for 1 minute then stays on and tire pressure monitor is canceled at
the same time. At this time, the ECU records a DTC in the memory.
Connecting te ...
Installation
INSTALLATION
CAUTION / NOTICE / HINT
HINT:
Use the same procedure for the RH side and LH side.
The procedure listed below is for the LH side.
PROCEDURE
1. INSTALL REAR POWER WINDOW REGULATOR MOTOR ASSEMBLY
NOTICE:
The regulator arm mus ...
Air Conditioning Amplifier
Components
COMPONENTS
ILLUSTRATION
Installation
INSTALLATION
PROCEDURE
1. INSTALL AIR CONDITIONING AMPLIFIER ASSEMBLY
(a) Install the air conditioning amplifier assembly with the 2 screws.
...