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
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
OK
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