Toyota Tundra. Manual — part 2420

Fig. 107: Ambient Temperature Sensor - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION 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

DATA LIST

OK:

The display is as specified in the normal condition.

Result

RESULT REFERENCE

B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS

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)

Result

Proceed to

NG

A

OK (Checking from the PROBLEM SYMPTOMS TABLE)

B

OK (Checking from the DTC)

C

2009 Toyota Tundra

2009 HVAC Air Conditioning - Tundra

TABLE (See PROBLEM SYMPTOMS TABLE )

C: REPLACE AIR CONDITIONING AMPLIFIER (See REMOVAL )

A: Go to Next Step

2. INSPECT AMBIENT TEMPERATURE SENSOR

a. Remove the ambient temperature sensor (see REMOVAL ).

Fig. 108: Temperature And Resistance Graph
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

Standard Resistance

2009 Toyota Tundra

2009 HVAC Air Conditioning - Tundra

TESTER CONNECTION SPECIFIED CONDITION CHART

HINT:

As the temperature increases, the resistance decreases (see the graph ).

NG: REPLACE AMBIENT TEMPERATURE SENSOR (See REMOVAL )

OK: Go to Next Step

3. CHECK HARNESS AND CONNECTOR (AMBIENT TEMPERATURE SENSOR - AIR

CONDITIONING AMPLIFIER)

a. Disconnect the A15 sensor connector.

b. Disconnect the J19 air conditioning amplifier connector.

Tester Connection Condition Specified Condition

1 - 2

10°C (50°F) 3.00 to 3.73 kohms
15°C (59°F) 2.45 to 2.88 kohms
20°C (68°F) 1.95 to 2.30 kohms
25°C (77°F) 1.60 to 1.80 kohms
30°C (86°F) 1.28 to 1.47 kohms
35°C (95°F) 1.00 to 1.22 kohms

40°C (104°F) 0.80 to 1.00 kohms
45°C (113°F) 0.65 to 0.85 kohms
50°C (122°F) 0.50 to 0.70 kohms
55°C (131°F) 0.44 to 0.60 kohms
60°C (140°F) 0.36 to 0.50 kohms

NOTE:



Even slightly touching the sensor may change the resistance
value. Be sure to hold the connector of the sensor.



When measuring, the sensor temperature must be the same as
the ambient temperature.

2009 Toyota Tundra

2009 HVAC Air Conditioning - Tundra

Fig. 109: Identifying Terminals Of J19 Air Conditioning Amplifier Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE AIR CONDITIONING AMPLIFIER (See REMOVAL )

DTC B1413/13 EVAPORATOR TEMPERATURE SENSOR CIRCUIT

DESCRIPTION

Tester Connection

Condition Specified Condition

A15-1 - J19-5 (TAM)

Always

Below 1 ohms

A15-2 - J19-13 (SG-2)

A15-1 or J19-5 (TAM) - Body ground

Always

10 kohms or higher

A15-2 or J19-13 (SG-2) - Body ground

2009 Toyota Tundra

2009 HVAC Air Conditioning - Tundra