Dtc B1413/13 Evaporator Temperature Sensor Circuit
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
READ VALUE USING TECHSTREAM
INSPECT EVAPORATOR TEMPERATURE SENSOR
INSPECT AIR CONDITIONING HARNESS
DTC B1413/13 Evaporator Temperature Sensor Circuit |
DESCRIPTION
The evaporator temperature sensor (A/C thermistor) is installed on the evaporator in the air conditioning unit. It detects the temperature of the cooled air that has passed through the evaporator and its signal is used to control the air conditioning. It sends a signal to the A/C amplifier. The resistance of the evaporator temperature sensor (A/C 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 A/C amplifier applies voltage (5 V) to the evaporator temperature sensor (A/C thermistor) and reads voltage changes as the resistance of the evaporator temperature sensor (A/C thermistor) changes. This sensor is used to prevent the evaporator from freezing.DTC No.
| DTC Detection Condition
| Trouble Area
|
B1413/13
| Open or short in evaporator temperature sensor circuit
| - Evaporator temperature sensor
- Air conditioning harness
- A/C amplifier
|
WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.READ VALUE USING TECHSTREAM |
Connect the Techstream to the DLC3.
Turn the ignition switch to ON.
Turn the Techstream on.
Enter the following menus: Body Electrical / Air Conditioner / Data List.
Check the value(s) by referring to the table below.
Air ConditionerTester Display
| Measurement Item/Range
| Normal Condition
| Diagnostic Note
|
Evaporator Fin Thermistor
(Evap Fin Temp)
| Evaporator fin temperature / Min.: -29.7°C (-21.46°F), Max.: 59.55°C (139.19°F)
| Actual evaporator temperature displayed
| Open in circuit: -29.7°C (-21.46°F)
Short in circuit: 59.55°C (139.19°F)
|
- 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 DTC)
| C
|
| 2.INSPECT EVAPORATOR TEMPERATURE SENSOR |
Remove the evaporator temperature sensor.
Disconnect the connector from the evaporator temperature sensor.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Condition
| Specified Condition
|
x2-1 - x2-2
| -10°C (14°F)
| 7.30 to 9.10 kΩ
|
x2-1 - x2-2
| -5°C (23°F)
| 5.65 to 6.95 kΩ
|
x2-1 - x2-2
| 0°C (32°F)
| 4.40 to 5.35 kΩ
|
x2-1 - x2-2
| 5°C (41°F)
| 3.40 to 4.15 kΩ
|
x2-1 - x2-2
| 10°C (50°F)
| 2.70 to 3.25 kΩ
|
x2-1 - x2-2
| 15°C (59°F)
| 2.14 to 2.58 kΩ
|
x2-1 - x2-2
| 20°C (68°F)
| 1.71 to 2.05 kΩ
|
x2-1 - x2-2
| 25°C (77°F)
| 1.38 to 1.64 kΩ
|
x2-1 - x2-2
| 30°C (86°F)
| 1.11 to 1.32 kΩ
|
- NOTICE:
- Hold the sensor only by its connector. Touching the sensor may change the resistance value.
- When measuring, the sensor temperature must be the same as the ambient temperature.
- HINT:
- As the temperature increases, the resistance decreases (see the graph).
Text in Illustration*a
| Component without harness connected
(Evaporator Temperature Sensor)
|
*b
| Sensing Portion
|
*c
| Resistance (kΩ)
|
*d
| Allowable Range
|
*e
| Temperature (°C (°F))
|
| 3.INSPECT AIR CONDITIONING HARNESS |
Remove the air conditioning harness.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Condition
| Specified Condition
|
X1-6 (TEA) - x2-2
| Always
| Below 1 Ω
|
X1-5 (SGA) - x2-1
| Always
| Below 1 Ω
|
X1-6 (TEA) - Body ground
| Always
| 10 kΩ or higher
|
X1-5 (SGA) - Body ground
| Always
| 10 kΩ or higher
|
Text in Illustration*a
| Front view of wire harness connector
(to Evaporator Temperature Sensor)
|
*b
| Front view of wire harness connector
(to A/C Amplifier)
|
