Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Room Temperature Sensor Circuit (B1411/11)

DESCRIPTION

The cooler thermistor (room temperature sensor) is installed in the instrument panel to detect the cabin temperature which is used to control the air conditioning system AUTO mode. The resistance of the cooler thermistor (room temperature sensor) changes in accordance with the cabin temperature. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.

The air conditioning amplifier assembly applies a voltage (5 V) to the cooler thermistor (room temperature sensor) and reads voltage changes due to changes in the resistance of the cooler thermistor (room temperature sensor).

DTC No.

DTC Detection Condition

Trouble Area

B1411/11

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

  • Cooler thermistor (room 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

Room Temperature Sensor

Cooler thermistor (room temperature sensor) /

min.: -6.50°C (20.30°F)

max.: 57.25°C (135.05°F)

Actual cabin 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 (ROOM TEMPERATURE SENSOR)

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

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

NG

REPLACE COOLER THERMISTOR (ROOM TEMPERATURE SENSOR)

OK

3.

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

(a) Disconnect the R36 cooler thermistor (room 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

R36-1 - A36-16 (TR)

Always

Below 1 Ω

R36-2 - A36-26 (SG-1)

Always

Below 1 Ω

R36-1 or A36-16 (TR) - Body ground

Always

10 kΩ or higher

R36-2 or A36-26 (SG-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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