LEXUS LS430 2003 Factory Repair Manual

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Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 59: DTC Reference Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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 resistance
value. Based on the resistance, the ECM determines the ATF temperature, and the ECM detects an opens or
shorts in the ATF temperature circuit. If the resistance value of the ATF temperature is less than 79ohms*1 or
more than 156kohms*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.
MONITOR STRATEGY
MONITOR STRATEGY TABLE
Related DTCsP0710: ATF temperature sensor/Range check
(Chattering) P0712: ATF temperature
sensor/Range check (Low resistance) P0713: ATF
temperature sensor/Range check (High resistance)
Required sensors/ComponentsATF temperature sensor (TFT sensor)
Frequency of operationContinuous
Duration0.5 sec.
MIL operationImmediate
Sequence of operationNone

TYPICAL ENABLING CONDITIONS
P0710: Range check (Chattering)
P0712: Range check (Low resistance)
TYPICAL ENABLING CONDITIONS TABLE - P0710, P0712
P0713: Range check (High resistance)
TYPICAL ENABLING CONDITIONS TABLE - P0713
TYPICAL MALFUNCTION THRESHOLDS
P0710: Range check (Chattering)
TYPICAL MALFUNCTION THRESHOLDS TABLE - P0710
P0712: Range check (Low resistance)
TYPICAL MALFUNCTION THRESHOLDS P0712
P0713: Range check (High resistance)
TYPICAL MALFUNCTION THRESHOLDS TABLE - P0713
COMPONENT OPERATING RANGE
COMPONENT OPERATING RANGE TABLE
WIRING DIAGRAM
The monitor will run whenever these DTCs are not
present.See LIST OF DISABLE A MONITOR
The typical enabling condition is not available.-
The monitor will run whenever this DTC is not
present.See LIST OF DISABLE A MONITOR
Time after engine start15 min. or more
TFT (transmission fluid temperature) sensor
resistanceLess than 79 ohms or More than 156 kohms
TFT sensor resistanceLess than 79ohms
TFT sensor resistanceMore than 156 kohms
TFT sensorAtmospheric temperature - approx. 130°C (266° F)

Fig. 60: DTCs P0710, P0712, P0713 - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
HINT:
According to the DATA LIST displayed by the 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 hand-held tester together with the CAN VIM (controller area network vehicle interface
module) to the DLC3.
d. Turn the ignition switch to the ON position.
e. Push the "ON" button of the hand-held tester.
f. Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST".
g. According to the display on tester, read the "DATA LIST".

Fig. 61: Test Item Reference Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
HINT:
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5800570003004c00560003001400180013008300260003000b[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 OIL (OT) and body ground.
CHECKING CIRCUIT MALFUNCTION TABLE
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.INSPECT TRANSMISSION WIRE (ATF TEMPERATURE SENSOR)
a. Disconnect the transmission wire connector from the transmission.
b. Measure the resistance according to the value(s) in the table below.
Temperature DisplayedMalfunction
-40°C (-40° F)Open circuit
150°C (302°F) or moreShort circuit

Fig. 62: Identifying Transmission Wire Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Standard:
ATF TEMPERATURE SENSOR - RESISTANCE TABLE
c. Measure the resistance according to the value(s) in the table below.
Standard (Check for short):
Tester ConnectionSpecified Condition
1 (OT-) - 9 (OT+)79ohms to 156kohms

Fig. 63: Transmission Wire Connector Reference Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE TRANSMISSION WIRE (See step 5 on REPLACEMENT
)
OK: Go to next step
2.CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)
a. Connect the transmission wire connector to the transmission.
b. Disconnect the ECM connector.
c. Measure the resistance according to the value(s) in the table below.
Standard:
TRANSMISSION WIRE - ECM - RESISTANCE TABLE
d. Measure the resistance according to the value(s) in the table below.
Fig. 64: Disconnecting ECM Connector
Tester ConnectionSpecified Condition
E6 - 27 (OIL) - E6 - 26 (EOIL)79ohms to 156kohms

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Standard (Check for short):
Fig. 65: Tester Connection Reference Chart

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (See ELECTRONIC CIRCUIT
INSPECTION PROCEDURE )
OK: REPLACE ECM (See REPLACEMENT
)
DTC P0711: TRANSMISSION FLUID TEMPERATURE SENSOR "A" PERFORMANCE
CIRCUIT DESCRIPTION
See CIRCUIT DESCRIPTION .
Fig. 66: DTC Reference Chart

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
MONITOR DESCRIPTION
This DTC indicates that there is a problem with output from the automatic transmission fluid (ATF) temperature
sensor and that the sensor itself is defective. The ATF temperature sensor converts the ATF temperature to an
electrical resistance value. Based on the resistance, the ECM determines the ATF temperature and detects an
opens or shorts in the ATF temperature circuit or a fault of the ATF temperature sensor. After running the
vehicle for a certain period, the ATF temperature should increase. If the ATF temperature is below 10°C (50°F)
after running the vehicle for a certain period, the ECM interprets this as a fault, and turns on the MIL.
MONITOR STRATEGY

MONITOR STRATEGY TABLE
TYPICAL ENABLING CONDITIONS
The following items are common to all conditions below
TYPICAL ENABLING CONDITIONS TABLE
TYPICAL MALFUNCTION THRESHOLDS
TYPICAL MALFUNCTION THRESHOLDS TABLE
COMPONENT OPERATING RANGE
COMPONENT OPERATING RANGE TABLE
WIRING DIAGRAM
See DTC P0710 TRANSMISSION FLUID TEMPERATURE SENSOR "A" CIRCUIT DTC P0712
TRANSMISSION FLUID TEMPERATURE SENSOR "A" CIRCUIT LOW INPUT DTC P0713
TRANSMISSION FLUID TEMPERATURE SENSOR "A" CIRCUIT HIGH INPUT .
INSPECTION PROCEDURE
Related DTCsP0711: ATF temperature sensor/Rationality check
Required sensors/ComponentsATF temperature sensor (TFT sensor)
Frequency of operationContinuous
Duration3 sec.
MIL operation2 driving cycles
Sequence of operationNone
The monitor will run whenever this DTC is not
present.See LIST OF DISABLE A MONITOR
TFT sensor circuitNot circuit malfunction
ECT (Engine coolant temperature) sensor circuitNot circuit malfunction
IAT (Intake air temperature) sensor circuitNot circuit malfunction
Duration time from engine start18 min. and 20 sec. or more
ECT10°C (50°F) or more
Time after engine start18 min. and 20 sec.
Driving distance after engine start9 km (5.6 mile) or more
IAT (12 sec. after engine start)-20 °C (-4°F) or more
ECT (12 sec. after engine start)-20 °C (-4°F) or more
TFT (Transmission fluid temperature)Less than 10°C (50°F) (ATF temperature = -10°C
(14°F) at engine start) (Conditions vary with ATF
temperature at engine start)
TFTAtmospheric temperature - approx. 130°C (266°F)

HINT:
According to the DATA LIST displayed by the 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 hand-held tester together with the CAN VIM (controller area network vehicle interface
module) to the DLC3.
d. Turn the ignition switch to the ON position.
e. Push the "ON" button of the hand-held tester.
f. Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST".
g. According to the display on tester, read the "DATA LIST".
Fig. 67: Test Item Reference Chart

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
HINT:
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5800570003004c00560003001400180013008300260003000b[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 OIL (OT) and body ground.
CHECKING CIRCUIT MALFUNCTION TABLE
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.
Temperature DisplayedMalfunction
-40 °C (-40° F)Open circuit
150°C (302°F) or moreShort circuit