Toyota Venza manuals

Toyota Venza: Evaporator Temperature Sensor Circuit (B1413/13)

Toyota Venza Service Manual / Heating / Air Conditioning / Air Conditioning System / Evaporator Temperature Sensor Circuit (B1413/13)

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

  • Evaporator temperature sensor
  • Air conditioning harness
  • A/C amplifier

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


A

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:

  • 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

*1

Component without harness connected

(Evaporator Temperature Sensor)

*2

Sensing Portion


NG

REPLACE EVAPORATOR TEMPERATURE SENSOR


OK

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:

Tester Connection

Condition

Specified Condition

z7-6 (TEA) - e2-2

Always

Below 1 Ω

z7-5 (SGA) - e2-1

Always

Below 1 Ω

z7-6 (TEA) - Body ground

Always

10 kΩ or higher

z7-5 (SGA) - Body ground

Always

10 kΩ or higher

Text in Illustration

*1

Front view of wire harness connector

(to A/C Amplifier)

*2

Front view of wire harness connector

(to Evaporator Temperature Sensor)



OK

REPLACE A/C AMPLIFIER


NG

REPLACE AIR CONDITIONING HARNESS

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