DTC Code | DTC Name |
---|---|
B1430/21 | Open in Room Temperature Sensor Circuit |
B1431/-21 | Short in Room Temperature Sensor Circuit |
DESCRIPTION
The cooler (room temp. sensor) thermistor is installed in the instrument panel to detect the cabin temperature which is used to control the heater and air conditioning system AUTO mode. The resistance of the cooler (room temp. sensor) thermistor changes in accordance with the cabin temperature. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.
The air conditioning control assembly applies a voltage (5 V) to the cooler (room temp. sensor) thermistor and reads voltage changes due to changes in the resistance of the cooler (room temp. sensor) thermistor.
DTC No. | DTC Detection Condition | Trouble Area |
---|---|---|
B1430/21 | Open in room temperature sensor circuit |
|
B1431/-21 | Short in room temperature sensor circuit |
|
WIRING DIAGRAM
*a | COOLER (ROOM TEMP. SENSOR) THERMISTOR |
*b | AIR CONDITIONING CONTROL ASSEMBLY |
PROCEDURE
READ VALUE USING GTS
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Body Electrical / Air Conditioner / Data List.
Check the value(s) by referring to the table below.
Tester Display | Measurement Item/Range | Normal Condition | Diagnostic Note |
---|---|---|---|
Room Temperature Sensor (Room Temp) |
Room Temperature Sensor / min.: -72.47°C (-98.4°F) max.: 193.82°C (380.9°F) |
Actual cabin temperature displayed | - |
OK |
---|
The display is as specified in the normal condition column. |
Result | ||||||||
---|---|---|---|---|---|---|---|---|
|
B |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here |
C |
INSPECT COOLER (ROOM TEMP. SENSOR) THERMISTOR Click here |
A |
CHECK FOR DTC
Clear the DTCs Click here.
Check the DTCs Click here.
OK |
---|
DTC is not output. |
OK |
END |
NG |
REPLACE AIR CONDITIONING CONTROL ASSEMBLY Click here |
INSPECT COOLER (ROOM TEMP. SENSOR) THERMISTOR
Remove the cooler (room temp. sensor) thermistor Click here.
Inspect the cooler (room temp. sensor) thermistor Click here.
NG |
REPLACE COOLER (ROOM TEMP. SENSOR) THERMISTOR Click here |
OK |
CHECK HARNESS AND CONNECTOR (COOLER (ROOM TEMP. SENSOR) THERMISTOR - AIR CONDITIONING CONTROL ASSEMBLY)
Disconnect the D20 air conditioning control assembly connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
OK |
REPLACE AIR CONDITIONING CONTROL ASSEMBLY Click here |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |