Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Evaporator Temperature Sensor Circuit (B1413/13)

DESCRIPTION

The cooler thermistor sensor (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 is used to control the air conditioning. It sends signals to the air conditioning amplifier assembly. The resistance of the cooler thermistor sensor (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 cooler thermistor sensor (evaporator temperature sensor) and reads voltage changes as the resistance of the cooler thermistor sensor (evaporator temperature sensor) changes. This sensor is used for frost prevention.

DTC No.

DTC Detection Condition

Trouble Area

B1413/13

Open or short in cooler thermistor sensor (evaporator temperature sensor) circuit

  • Cooler thermistor sensor (Evaporator temperature sensor)
  • Harness or connector
  • Air conditioning amplifier assembly

WIRING DIAGRAM

PROCEDURE

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 Electrical / 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

Cooler thermistor sensor (Evaporator temperature sensor) /

Min.: -29.70°C (-21.46°F)

Max.: 59.55°C (139.19°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 AIR CONDITIONING AMPLIFIER ASSEMBLY

A

2.

INSPECT COOLER THERMISTOR SENSOR (EVAPORATOR TEMPERATURE SENSOR)

(a) Remove the cooler thermistor sensor (evaporator temperature sensor) (See page (b) Inspect the cooler thermistor sensor (evaporator temperature sensor) (See ).

(b) Inspect the cooler thermistor sensor (evaporator temperature sensor) (See page ).

NG

REPLACE COOLER THERMISTOR SENSOR (EVAPORATOR TEMPERATURE SENSOR)

OK

3.

CHECK HARNESS AND CONNECTOR (COOLER THERMISTOR SENSOR (EVAPORATOR TEMPERATURE SENSOR) - AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Disconnect the A17 cooler thermistor sensor (evaporator temperature sensor) connector.

(b) Disconnect the A36 air conditioning amplifier assembly connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A36-15 (TE) - A17-2

Always

Below 1 Ω

A36-27 (SG-7) - A17-1

Always

Below 1 Ω

A36-15 (TE) or A17-2 - Body ground

Always

10 kΩ or higher

A36-27 (SG-7) or A17-1 - Body ground

Always

10 kΩ or higher

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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Other materials:

Data List / Active Test
DATA LIST / ACTIVE TEST 1. DATA LIST HINT: Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals ...

Problem Symptoms Table
PROBLEM SYMPTOMS TABLE HINT: Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptom are listed in order of probability in the "Suspected Area" column of the table. Check each sym ...

Data List / Active Test
DATA LIST / ACTIVE TEST NOTICE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not. HINT: Using the Techstream to read the Data List allows the values or s ...

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