Toyota Tundra. Manual — part 2804

Fig. 30: Identifying Resistance & Temperature Graph
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

The ECM applies voltage to the temperature sensor through the ECM terminal THO1.

The sensor resistance changes with the transmission fluid temperature. As the temperature becomes higher, the
sensor resistance decreases.

One terminal of the sensor is grounded so that the sensor resistance decreases and the voltage goes down as the
temperature becomes higher.

The ECM calculates the fluid temperature based on the voltage signal.

DTC DETECTION CONDITION TABLE

MONITOR DESCRIPTION

DTC Code

DTC Detection Condition

Trouble Area

P0712

No. 1 ATF temperature sensor
resistance is less than 79 ohms for
0.5 sec. or more (1-trip detection
logic)



Short in ATF temperature
sensor circuit



ATF temperature sensor



ECM

P0713

Either of the following conditions
is met (1 trip detection logic):
(A) 15 minutes or more after the
engine is started, ATF temperature
sensor resistance is more than 156
kohms for 0.5 sec. or more.
(B) The enabling conditions of the
monitor for DTC PO711 are met,
and ATF temperature sensor
resistance is more than 156 kohms
for 0.5 sec. or more.



Open in ATF temperature
sensor circuit



ATF temperature sensor



ECM

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra

The ATF temperature sensor converts the ATF temperature to 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 79 ohms*1 or more than 156
kohms*2, the ECM interprets this as a fault in the ATF sensor or wiring. The ECM will turn on the MIL and
store the DTC.

HINT:



The ATF temperature can be checked on the Techstream display.



*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.

MONITOR STRATEGY

MONITOR STRATEGY TABLE

TYPICAL ENABLING CONDITIONS

P0712: Range Check (Chattering, Low Resistance)

TYPICAL ENABLING CONDITIONS TABLE

P0713: Range Check (High Resistance)

One of the following conditions is met: Condition (A) or (B)

Condition (A)

TYPICAL ENABLING CONDITIONS TABLE

Condition (B)

Related DTCs

P0712: ATF temperature sensor/Range check (Low

resistance)

P0713: ATF temperature sensor/Range check (High

resistance)

Required sensors/Components

ATF temperature sensor

Frequency of operation

Continuous

Duration

0.5 sec.

MIL operation

Immediate

Sequence of operation

None

The monitor will run whenever this DTC is not present

None

The typical enabling condition is not available

-

This monitor will run whenever this DTC is not
present

None

Time after engine start

15 min. or more

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra

The enabling conditions of the monitor for DTC P0711 are met

TYPICAL MALFUNCTION THRESHOLDS

P0712: Range Check (Low Resistance)

TYPICAL MALFUNCTION THRESHOLDS TABLE

P0713: Range Check (High Resistance)

TYPICAL MALFUNCTION THRESHOLDS TABLE

COMPONENT OPERATING RANGE

COMPONENT OPERATING RANGE TABLE

WIRING DIAGRAM

Fig. 31: Identifying Transmission Fluid Temperature Sensor Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

ATF temperature sensor resistance

Below 79 ohms

ATF temperature sensor resistance

Higher than 156 kohms

ATF temperature sensor resistance

79 ohms to 156 kohms

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra

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 tip 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 P0712 is output and the Techstream output is 150°C (302°F) or more, there is a short
circuit.

When DTC P0713 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 TABLE

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 1

No. 1 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. 1 ATF
temperature sensor circuit is
open or shorted

Temperature Displayed Malfunction

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra