Dtc B1413/13 Evaporator Temperature Sensor Circuit
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
READ VALUE USING TECHSTREAM (EVAPORATOR FIN THERMISTOR)
INSPECT NO. 1 COOLER THERMISTOR (EVAPORATOR TEMPERATURE SENSOR)
CHECK HARNESS AND CONNECTOR (No. 1 COOLER THERMISTOR - AIR CONDITIONING AMPLIFIER)
DTC B1413/13 Evaporator Temperature Sensor Circuit |
DESCRIPTION
The No. 1 cooler thermistor (evaporator temperature sensor) 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 to control the air conditioner. It sends signals to the air conditioning amplifier, which change in accordance with the resistance of the No. 1 cooler thermistor (evaporator temperature sensor). As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases. The air conditioning amplifier applies a voltage (5V) to the No. 1 cooler thermistor (evaporator temperature sensor) and reads voltage changes as changes in the resistance of the evaporator temperature sensor. This sensor is used for frost prevention. DTC No.
| DTC Detection Condition
| Trouble Area
|
B1413/13
| Open or short in evaporator temperature sensor circuit
| - No. 1 cooler thermistor (evaporator temperature sensor)
- Harness and connector between No. 1 cooler thermistor (evaporator temperature sensor) and air conditioning amplifier
- Air conditioning amplifier
|
WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.READ VALUE USING TECHSTREAM (EVAPORATOR FIN THERMISTOR) |
Connect the Techstream to the DLC3.
Turn the ignition switch to ON.
Turn the tester on.
Select the following menus: Body Electrical / Air Conditioner / Data List / Evaporator Fin Thermistor
According to the display on tester, read the "Data List".
- Data List / Air Conditioner:
Tester Display
| Measurement Item/Range
| Normal Condition
| Diagnostic Note
|
Evaporator fin thermistor
| Evaporator fin thermistor /
Min.: -29.7°C (-21.46°F)
Max.: 59.55°C (139.019°F)
| Actual evaporator temperature is displayed
| Open circuit: -29.7°C (-21.46°F)
Short circuit: 59.55°C (139.019°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 the DTC)
| C
|
| 2.INSPECT NO. 1 COOLER THERMISTOR (EVAPORATOR TEMPERATURE SENSOR) |
Remove the evaporator temperature sensor.
Measure the resistance.
- 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
|
- NOTICE:
- Touching the sensor even slightly may change the resistance value. Be sure to hold the connector of the sensor.
- When measuring, the sensor temperature must be the same as the ambient temperature.
- HINT:
- As the temperature increases, the resistance decreases (see the graph on the left).
Reinstall the evaporator temperature sensor.
| 3.CHECK HARNESS AND CONNECTOR (No. 1 COOLER THERMISTOR - AIR CONDITIONING AMPLIFIER) |
Disconnect the E2 No. 1 cooler thermistor (evaporator temperature sensor) connector.
Disconnect the E8 air conditioning amplifier connector.
Measure the resistance.
- Standard resistance:
Tester Connection
| Specified Condition
|
E2-2 - E8-10 (TE)
| Below 1 Ω
|
E2-1 - E8-4 (SG-2)
| Below 1 Ω
|
E2-2 - Body ground
| 10 kΩ or higher
|
E2-1 - Body ground
| 10 kΩ or higher
|
Reconnect the No. 1 cooler thermistor connector.
Reconnect the air conditioning amplifier connector.
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
