Toyota CH-R Service Manual: Room Temperature Sensor Circuit (B1411)

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. 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 voltage (5 V) to the cooler thermistor (room temperature sensor) thermistor and reads voltage changes due to changes in the resistance of the cooler thermistor (room temperature sensor).

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

B1411

Room Temperature Sensor Circuit

Any of the following conditions is met:

  • Open in cooler thermistor (room temperature sensor) circuit
  • Short in cooler thermistor (room temperature sensor) circuit
  • Cooler thermistor (room temperature sensor)
  • Harness or connector between cooler thermistor (room temperature sensor) and air conditioning amplifier assembly
  • Air conditioning amplifier assembly

Memorized

(4 seconds or more)*

  • *: The air conditioning amplifier assembly stores this DTC if the malfunction has occurred for the period of time indicated in the brackets.

HINT:

If the cabin temperature is approximately -18.6°C (-1.48°F) or lower, DTC B1411 may be output even though the system is normal.

DTC Detection Conditions
 

Vehicle Condition

Pattern 1

Pattern 2

Diagnosis Condition

Ignition switch ON

Malfunction Status

Open in cooler thermistor (room temperature sensor) circuit

-

Short in cooler thermistor (room temperature sensor) circuit

-

Detection Time

4 seconds or more

4 seconds or more

Number of Trips

1 trip

1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

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 Electrical / Air Conditioner / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Air Conditioner > Data List

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

-

Body Electrical > Air Conditioner > Data List

Tester Display

Room Temperature Sensor

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

GO TO STEP 4

A

2.

INSPECT COOLER THERMISTOR (ROOM TEMPERATURE SENSOR)

(a) Remove the cooler thermistor (room temperature sensor).

Click here

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

Click here

NG

REPLACE COOLER (ROOM TEMP. SENSOR) THERMISTOR

OK

3.

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

(a) Disconnect the F138 air conditioning amplifier assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F138-14 (TR) - F60-1

Always

Below 1 Ω

F138-1 (SG-1) - F60-2

Always

Below 1 Ω

F138-14 (TR) or F60-1 - Body ground

Always

10 kΩ or higher

F138-1 (SG-1) or F60-2 - Body ground

Always

10 kΩ or higher

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.

CHECK FOR DTC

(a) Clear the DTCs.

Click here

Body Electrical > Air Conditioner > Clear DTCs

(b) Check for DTCs.

Click here

Body Electrical > Air Conditioner > Trouble Codes

Result

Proceed to

DTCs are not output

A

DTCs are output

B

A

USE SIMULATION METHOD TO CHECK

B

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

    Pressure Sensor Circuit (B1423)
    DESCRIPTION This DTC is stored if refrigerant pressure on the high pressure side is extremely low (195 kPa (2.0 kgf/cm2, 28 psi) or less) or extremely high (2812 kPa (28.7 kgf/cm2, 408 psi) or mo ...

    Ambient Temperature Sensor Circuit (B1412)
    DESCRIPTION The thermistor assembly is installed in front of the cooler condenser assembly to detect the ambient temperature, which is used to control the air conditioning system. This sensor is ...

    Other materials:

    Toyota CH-R Service Manual > Can Communication System: Headlight ECU Communication Stop Mode
    DESCRIPTION Detection Item Symptom Trouble Area Headlight ECU Communication Stop Mode Any of the following conditions are met: Communication stop for "Headlight swivel (AFS)" is indicated on the "Communi ...

    Toyota CH-R Service Manual > Navigation System: Freeze Frame Data
    FREEZE FRAME DATA CHECK FREEZE FRAME DATA (a) Connect the Techstream to the DLC3. (b) Turn the engine switch on (IG). (c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / Navigation System / Trouble Codes. Body Electrical > Navigation System > Trouble Codes (e) ...

    © 2017-2019 Copyright www.tochr.net
    0.0232