Toyota Tundra. Manual — part 2838

MONITOR DESCRIPTION

The ATF temperature sensor converts the ATF temperature into an electrical resistance value. Based on the
resistance, the ECM determines the ATF temperature, and the ECM detects an open or short in the ATF
temperature circuit. If the resistance value of the ATF temperature is less than 25 ohms*1 or more than 156
kohms*2, the ECM interprets this as a fault in the ATF sensor or wiring. The ECM will illuminate the MIL and
store the DTC.

HINT:



*1: 150°C (302°F) or more is indicated regardless of the actual ATF temperature.



*2: -40°C (-40°F) is indicated regardless of the actual ATF temperature.



The ATF temperature can be checked on the Techstream display.

MONITOR STRATEGY

MONITOR STRATEGY TABLE

kohms (4.915 V).

HINT:
Within 0.5 sec, the malfunction switches from (a) to (b) or from
(b) to (a).

(No. 2 ATF temperature
sensor)



ECM

P2742

No. 2 ATF temperature sensor resistance is less than 25 ohms
(0.046 V) for 0.5 sec. or more. (1-trip detection logic)



Short in No. 2 ATF
temperature sensor
circuit



No. 1 transmission wire
(No. 2 ATF temperature
sensor)



ECM

P2743

When 15 min. or more have elapsed after engine is started, No. 2
ATF temperature sensor resistance is more than 156 kohms
(4.915 V) for 0.5 sec. or more (1-trip detection logic)



Open in No. 2 ATF
temperature sensor
circuit



No. 1 transmission wire
(No. 2 ATF temperature
sensor)



ECM

Related DTCs

P2740: ATF temperature sensor/Range check (Fluttering)
P2742: ATF temperature sensor/Range check (Low resistance)
P2743: ATF temperature sensor/Range check (High resistance)

Required sensors/Components

ATF temperature sensor

Frequency of operation

Continuous

Duration

0.5 sec.

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra

TYPICAL ENABLING CONDITIONS

All

TYPICAL ENABLING CONDITIONS TABLE

P2740: Range Check (Chattering)

TYPICAL ENABLING CONDITIONS TABLE

P2742: Rang Check (Low Voltage)

TYPICAL ENABLING CONDITIONS TABLE

P2743: Range Check (High Voltage)

TYPICAL ENABLING CONDITIONS TABLE

TYPICAL MALFUNCTION THRESHOLDS

P2740: Range Check (Chattering)

TYPICAL MALFUNCTION THRESHOLDS TABLE

P2742: Range Check (Low Voltage)

TYPICAL MALFUNCTION THRESHOLDS TABLE

P2743: Range Check (High Voltage)

TYPICAL MALFUNCTION THRESHOLDS TABLE

COMPONENT OPERATING RANGE

COMPONENT OPERATING RANGE TABLE

MIL operation

Immediately

Sequence of operation

None

The monitor will run whenever the following DTCs are not stored

None

The typical enabling condition is not available.

-

The typical enabling condition is not available.

-

Time after engine start

15 min. or more

ATF temperature sensor voltage

Below 0.046 V or higher than 4.915 V

ATF temperature sensor voltage

Below 0.046 V

ATF temperature sensor voltage

Higher than 4.915 V

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra

WIRING DIAGRAM

Refer to WIRING DIAGRAM .

INSPECTION PROCEDURE

1. DATA LIST

HINT:

Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and
other items to be read without removing any parts. This non-intrusive inspection can be very useful
because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading
the Data List information early in troubleshooting is one way to save diagnostic time.

a. Warm up the engine.

b. Turn the ignition switch off.

c. Connect the Techstream to the DLC3.

d. Turn the ignition switch to ON.

e. Turn the Techstream on.

f. Enter the following menus: Powertrain/Engine and ECT/Data List.

g. According to the display on the Techstream, read the Data List.

Engine and ECT:

DATA LIST TABLE

HINT:



When DTC P2742 is output and the Techstream output is 150°C (302°F) or more, there is a

ATF temperature sensor voltage

0.046 to 4.915 V

NOTE:

In the table below, the values listed under "Normal Condition" are
reference values. Do not depend solely on these reference values when
deciding whether a part is faulty or not.

Tester

Display

Measurement

Item/Range

Normal Condition

Diagnostic Note

A/T Oil

Temperature 2

No. 2 ATF temperature
sensor value/ Min.: -
40°C (-40°F)
Max.: 215°C (419°F)



After stall test:
Approximately 80°C
(176°F)



With engine cold:
Equal to ambient
temperature

If value is -40°C (-40°F) or
215°C (419°F), No. 2 ATF
temperature sensor circuit is
open or shorted

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra

short circuit.



When DTC P2743 is output and the Techstream output is -40°C (-40°F), there is an open
circuit.

Check the temperature displayed on the Techstream in order to check if a malfunction exists.

TEMPERATURE DISPLAYED REFERENCE TABLE

1. INSPECT NO. 1 TRANSMISSION WIRE (NO. 2 ATF TEMPERATURE SENSOR)

a. Disconnect the D63 No. 1 transmission wire connector.

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION TABLE

HINT:

If the resistance is out of the specified range of one of the ATF temperatures shown in the table
below, the driveability of the vehicle may decrease.

Fig. 108: Identifying D63 No. 1 Transmission Wire Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Temperature Displayed Malfunction

-40°C (-40°F)

Open circuit

150°C (302°F) or more Short circuit

Tester Connection

Condition Specified Condition

2 (OT2-) - 10 (OT2+)

Always 25 ohms to 156 kohms

2 (OT2-) - Body ground

Always

10 kohms or higher

10 (OT2+) - Body ground Always

10 kohms or higher

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra