Toyota Tundra (2015 year). Manual — part 2251
(a) Disconnect the J16 sensor connector.
(b) Disconnect the J19 air conditioning amplifier connector.
(c) Measure the resistance according to the value(s) in the table
below.
Standard resistance:
TESTER CONNECTION
CONDITION
SPECIFIED
CONDITION
J16-1 - J19-29 (TR)
Always
Below 1 Ω
J16-2 - J19-34 (SG-1)
J16-1 or J19-29 (TR) - Body
ground
Always
10 kΩ or higher
J16-2 or J19-34 (SG-1) - Body
ground
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE AIR CONDITIONING AMPLIFIER
AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic A...
Last Modified: 9-16-2014
6.6 C
Doc ID: RM000002VXC00WX
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System): B1412/12;
Ambient Temperature Sensor Circuit; 2015 MY Tundra [08/2014 - ]
DTC
B1412/12 Ambient Temperature Sensor Circuit
DESCRIPTION
detects fluctuations in the ambient temperature. This data is used for controlling the cabin temperature. The
temperature increases, the resistance decreases.
The air conditioning amplifier applies voltage (5 V) to the ambient temperature sensor and reads voltage changes
CODE
DTC DETECTION CONDITION
TROUBLE AREA
B1412/12
Open or short in ambient
temperature sensor circuit
Ambient temperature sensor
Harness or connector between ambient temperature
sensor and air conditioning amplifier
Air conditioning amplifier
WIRING DIAGRAM
INSPECTION PROCEDURE
AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic A...
A
PROCEDURE
1.
READ VALUE USING TECHSTREAM (AMBIENT TEMPERATURE SENSOR)
(a) Use the Data List to check if the ambient temperature sensor is functioning properly.
Air Conditioner
TESTER DISPLAY
MEASUREMENT ITEM /
RANGE
NORMAL CONDITION
DIAGNOSTIC NOTE
Ambient Temp
Sensor
Ambient temperature
sensor /
Min.: -23.3°C (-9.94°F)
Max.: 65.95°C (150.71°F)
Actual ambient temperature is
displayed
Open in circuit: -23.3°C
(-9.94°F)
Short in circuit: 65.95°C
(150.71°F)
OK:
The display is as specified in the normal condition.
Result
RESULT
PROCEED TO
NG
A
OK (Checking from the PROBLEM SYMPTOMS TABLE)
B
OK (Checking from the DTC)
C
B
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN
PROBLEM SYMPTOMS TABLE
C
REPLACE AIR CONDITIONING AMPLIFIER
2.
INSPECT AMBIENT TEMPERATURE SENSOR
AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic A...
OK
(a) Remove the ambient temperature sensor
.
(b) Measure the resistance according to the value(s) in the
table below.
Standard resistance:
TESTER CONNECTION
CONDITION
SPECIFIED CONDITION
1 - 2
10°C (50°F)
3.00 to 3.73 kΩ
15°C (59°F)
2.45 to 2.88 kΩ
20°C (68°F)
1.95 to 2.30 kΩ
25°C (77°F)
1.60 to 1.80 kΩ
30°C (86°F)
1.28 to 1.47 kΩ
35°C (95°F)
1.00 to 1.22 kΩ
40°C (104°F)
0.80 to 1.00 kΩ
45°C (113°F)
0.65 to 0.85 kΩ
50°C (122°F)
0.50 to 0.70 kΩ
55°C (131°F)
0.44 to 0.60 kΩ
60°C (140°F)
0.36 to 0.50 kΩ
NOTICE:
As the temperature increases, the resistance decreases (see the
graph).
NG
REPLACE AMBIENT TEMPERATURE SENSOR
3.
CHECK HARNESS AND CONNECTOR (AMBIENT TEMPERATURE SENSOR - AIR
CONDITIONING AMPLIFIER)
AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic A...
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