Toyota Sequoia (2005). Manual - part 197

A67628

A67628

D14156

Acceptable

Resistance

Temp.

–

DIAGNOSTICS

AUTOMATIC TRANSMISSION

DI–583

777

CIRCUIT DESCRIPTION

The ATF (Automatic Transmission Fluid) temperature sensor
converts the fluid temperature into a resistance value which is
input into the ECM.
The ECM applies a voltage to the temperature sensor through
ECM terminal THO1. 
The sensor resistance changes with the transmission fluid tem-
perature. As the temperature becomes higher, the sensor resis-
tance decreases.
One terminal of the sensor is grounded so that the sensor resis-
tance decreases and the voltage goes down as the tempera-
ture becomes higher.
The ECM calculates the fluid temperature based on the voltage
signal.

DTC No.

DTC Detection Condition

Trouble Area

P0710

(a) and (b) are detected momentarily within 0.5 sec. when

neither P0712 nor P0713 is detected (1–trip detection logic)

(a) ATF temperature sensor No.1 resistance is less than 79 

Ω.

(b) ATF temperature sensor No.1 resistance is more than 156

k

Ω.

HINT:

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

(b) to (a)

Open or short in ATF temperature sensor No.1 circuit

Transmission wire (ATF temperature sensor No.1)

ECM

P0712

ATF temperature sensor No.1 resistance is less than 79 

Ω 

for

0.5 sec. or more (1–trip detection logic)

Short in ATF temperature sensor No.1 circuit

Transmission wire (ATF temperature sensor No.1)

ECM

P0713

ATF temperature No.1 sensor resistance is more than 156 k

Ω

when 15 minutes or more have elapsed after the engine start

DTC is detected for 0.5 sec. or more (1–trip detection logic)

Open in ATF temperature sensor No.1 circuit

Transmission wire (ATF temperature sensor No.1)

ECM

MONITOR DESCRIPTION

These DTCs indicate an open or short in the automatic transmission fluid (ATF) temperature sensor circuit.
The automatic transmission fluid (ATF) temperature sensor converts ATF temperature to an electrical resis-
tance 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

Ω

*1

or more than 156k

Ω

*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.
*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.

HINT:
The ATF temperature can be checked on the OBD II scan tool or hand–held tester display.

DI–584

–

DIAGNOSTICS

AUTOMATIC TRANSMISSION

778

MONITOR STRATEGY

P0710

ATF temperature sensor/Range check (Fluttering)

Related DTCs

P0712

ATF temperature sensor/Range check (Low resistance)

Related DTCs

P0713

ATF temperature sensor/Range check (High resistance)

Required sensors/Components

ATF temperature sensor (TFT sensor)

Frequency of operation

Continuous

Duration

0.5 sec.

MIL operation

Immediate

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

It

Specification

Item

Minimum

Maximum

The monitor will run whenever these

DTCs are not present.

See page 

DI–545

Range check (Fluttering, Low resistance)

The typical enabling condition is not avail-

able.

–

Range check (High resistance)

Time after engine start

15 min. or more

–

TYPICAL MALFUNCTION THRESHOLDS

Detection criteria

Threshold

Range check (Fluttering)

TFT (transmission fluid temperature) sensor resistance

Less than 79 

Ω

or

More than 156 k

Ω

Range check (Low resistance)

TFT (transmission fluid temperature) sensor resistance

Less than 79 

Ω

Range check (High resistance)

TFT (transmission fluid temperature) sensor resistance

More than 156 k

Ω

COMPONENT OPERATING RANGE

Parameter

Standard value

TFT (transmission fluid temperature) sensor

Atmospheric temperature to approx. 130

°

C (266

°

F)

D14157

O

E1 Electronically Controlled 
Transmission Solenoid

OT–

O

OT+

L

OT2–

L

OT2+

G–W

G–W

G–W

G

B–L

G–W

2

1

10

9

E7

E7

E8

28

32

24

THO2

THO1

E2

ECM

–

DIAGNOSTICS

AUTOMATIC TRANSMISSION

DI–585

779

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:
According to the DATA LIST displayed by the OBD II scan tool or hand–held tester, you can read the value
of the switch, sensor, actuator and so on without parts removal. Reading the DATA LIST as the first step of
troubleshooting  is one method to shorten labor time.
(a)

Warm up the engine.

(b)

Turn the ignition switch off.

(c)

Connect the OBD II scan tool or hand–held tester to the DLC3.

(d)

Turn the ignition switch to the ON position.

(e)

Push the ”ON” button of the OBD II scan tool or the hand–held tester.

(f)

When you use the hand–held tester:
Select the item ”DIAGNOSIS / ENHANCED OBD II / DATA LIST”.

(g)

According to the display on the tester, read the ”DATA LIST”.

Item

Measurement Item/

Range (display)

Normal Condition

AT FLUID TEMP 1

ATF Temp. Sensor Value/

min.: –40



C (–40



F)

max.: 215



C (419



F)

After Stall Test;
Approx. 80



C (176



F)

Equal to ambient temperature when cold soak

HINT:
When DTC P0712 is output and hand–held tester output is 150



C (302



F) or more, there is a short circuit.

When DTC P0713 is output and hand–held tester output is –40



C (–40



F), there is an open circuit.

Measure the resistance between terminal THO1 (OT) and body ground.

Temperature Displayed

Malfunction

–40

°

C (–40

°

F)

Open circuit

150

°

C (302

°

F) or more

Short circuit

HINT:
If a circuit related to the ATF temperature sensor becomes open, P0713 is immediately set (in 0.5 second).
When P0713 is set, P0711 cannot be detected.
It is not necessary to inspect the circuit when P0711 is set.

1

15

2

3

4

5

6

7

8

9

10

11

12

13

14

D11994

OT+

OT–

E1

Transmission Wire Side:
(Connector Front View):

DI–586

–

DIAGNOSTICS

AUTOMATIC TRANSMISSION

780

1

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

PREPARATION:
Disconnect the transmission wire connector from the transmis-
sion.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:

Tester Connection

Specified Condition

2 (OT–) – 10 (OT+)

79 

Ω

 to 156 k

Ω

2 (OT–) – Body ground

10 k

Ω

 or higher

10 (OT+) – Body ground

10 k

Ω

 or higher

HINT:
If the resistance is out of the specified range with either the ATF
temperature shown in the table below, the driveability of the ve-
hicle may decrease.

ATF Temperature

Specified Condition

20

°

C (68

°

F)

3 to 4 k

Ω

110°

C (230

°

F)

0.22 to 0.28 k

Ω

NG

Repair or replace the transmission wire 
(ATF temperature sensor No.1)
(See page 

AT–7

).

OK