DESCRIPTION
The room temperature sensor is installed in the instrument panel. It detects the cabin temperature to control the air conditioning AUTO mode. The resistance of the 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 A/C amplifier applies voltage (5 V) to the room temperature sensor and reads voltage changes as the resistance of the room temperature sensor changes. This sensor also sends appropriate signals to the A/C amplifier.
DTC No. |
DTC Detection condition |
Trouble Area |
---|---|---|
B1411/11 |
Open or short in room temperature sensor circuit |
|
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 |
---|---|---|---|
Room Temperature Sensor |
Room temperature sensor / Min.: -6.5°C (20.3°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 A/C AMPLIFIER |
|
2. |
INSPECT ROOM TEMPERATURE SENSOR |
(a) Remove the room temperature sensor.
(b) Disconnect the room temperature sensor connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
D11-1 - D11-2 |
10°C (50°F) |
3.00 to 3.73 kΩ |
D11-1 - D11-2 |
15°C (59°F) |
2.45 to 2.88 kΩ |
D11-1 - D11-2 |
20°C (68°F) |
1.95 to 2.30 kΩ |
D11-1 - D11-2 |
25°C (77°F) |
1.60 to 1.80 kΩ |
D11-1 - D11-2 |
30°C (86°F) |
1.28 to 1.47 kΩ |
D11-1 - D11-2 |
35°C (95°F) |
1.00 to 1.22 kΩ |
D11-1 - D11-2 |
40°C (104°F) |
0.80 to 1.00 kΩ |
D11-1 - D11-2 |
45°C (113°F) |
0.65 to 0.85 kΩ |
D11-1 - D11-2 |
50°C (122°F) |
0.50 to 0.70 kΩ |
D11-1 - D11-2 |
55°C (131°F) |
0.44 to 0.60 kΩ |
D11-1 - D11-2 |
60°C (140°F) |
0.36 to 0.50 kΩ |
NOTICE:
HINT:
As the temperature increases, the resistance decreases (see the graph).
Text in Illustration
*1 |
Component without harness connected (Room Temperature Sensor) |
*2 |
Sensing Portion |
NG | ![]() |
REPLACE ROOM TEMPERATURE SENSOR |
|
3. |
CHECK HARNESS AND CONNECTOR (ROOM TEMPERATURE SENSOR - A/C AMPLIFIER) |
(a) Disconnect the A/C amplifier connector. |
|
(b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
OK | ![]() |
REPLACE A/C AMPLIFIER |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
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 symptoms are listed in order
of probability in the "Suspected Area" column of ...
Installation
INSTALLATION
PROCEDURE
1. INSTALL CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (for Exhaust Side)
(a) Apply a light coat of engine oil to a new O-ring, and install it
to the oil control valve.
Text in Illustration
*1
...
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 symptoms
are listed in order of probability in the "Suspected Area" ...