o2 sensor TOYOTA HIGHLANDER 2001 Service Repair Manual

05-928- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E/U140F)
111 8 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0710 TRANSMISSION FLUID TEMPERATURE
SENSOR ºAº CIRCUIT
DTC P0712 TRANSMISSION FLUID TEMPERATURE
SENSOR ºAº CIRCUIT LOW INPUT
DTC P0713 TRANSMISSION FLUID TEMPERATURE
SENSOR ºAº CIRCUIT HIGH INPUT
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 (THO).
The sensor resistance changes with the transmission fluid temperature. As the temperature becomes high-
er, 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 No.DTC Detection ConditionTrouble Area
P0710
(a) and (b) is detected momentary within 0.5 sec. when neither
P0712 or P0713 is not detected (1-trip detection logic)
(a) ATF temperature sensor resistance is less than 79 W.
(b) ATF temperature sensor resistance is more than 156 kW.
HINT:
Within 0.5 sec., the malfunction switches from (a) to (b) or from
(b) to (a)

Open or short in ATF temperature sensor circuit

Transmission wire (ATF temperature sensor)

ECM
P0712ATF temperature sensor resistance is less than 79 W for 0.5
sec. or more (1-trip detection logic)
Short in ATF temperature sensor circuit

Transmission wire (ATF temperature sensor)

ECM
P0713
ATF temperature sensor resistance is more than 156 kW when
15 minutes or more after the engine start
DTC is detected for 0.5 sec. or more (1-trip detection logic)
Open in ATF temperature sensor circuit

Transmission wire (ATF temperature sensor)

ECM
MONITOR DESCRIPTION
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
opens or shorts in the ATF temperature circuit. If the resistance value of the ATF temperature is less than
79
W*1 or more than 156 kW*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: 150C (302F) or more is indicated regardless of the actual ATF temperature.
*2: -40C (-40F) 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.
0527N-31

- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E/U140F)05-929
111 9 Author
: Date
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
MONITOR STRATEGY
Related DTCs
P0710: ATF temperature sensor/Range check (Fluttering)
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 (Fluttering)
P0712: Range check (Low resistance)
The monitor will run whenever these DTCs are not present.See page 05-895
The typical enabling condition is not available.-
P0713: Range check (High resistance)
The monitor will run whenever this DTC is not present.See page 05-895
Time after engine start15 min. or more
TYPICAL MALFUNCTION THRESHOLDS
P0710: Range check (Fluttering)
TFT (transmission fluid temperature) sensor
Less than 79 W
or
More than 156 kW
P0712: Range check (Low resistance)
TFT (transmission fluid temperature) sensorLess than 79 W
P0713: Range check (High resistance)
TFT (transmission fluid temperature) sensorMore than 156 kW
COMPONENT OPERATING RANGE
TFT (transmission fluid temperature)Atmospheric temperature - approx. 130C (266F)

C54864
THO
E2 Transmission Wire Side:
(Connector Front View):
E10
- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E/U140F)05-931
1121 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
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 ºONº button of the OBD II scan tool or the hand-held tester.
(f) When you use hand-held tester:
Select the item ºDIAGNOSIS/ENHANCED OBD II/DATA LISTº.
(g) According to the display on tester, read the ºDATA LISTº.
ItemMeasurement Item/
Range (display)Normal Condition
AT FLUID TEMP
ATF Temp. Sensor Value/
min.: -40C (-40F)
max.: 215C (419F)
Approx. 80C (176F) (After Stall Test)
HINT:
When DTC P0712 is output and OBD II scan tool or hand-held tester output is 150C (302F), there is a
short circuit.
When DTC P0713 is output and OBD II scan tool or hand-held tester output is -40C (-40F), there is an
open circuit.
Measure the resistance between terminal THO1 (THO) and body ground.
Temperature DisplayedMalfunction
-40°C (-40°F)Open circuit
150°C (302°F) or moreShort circuit
1 INSPECT TRANSMISSION WIRE(ATF TEMPERATURE SENSOR)
(a) Disconnect the transmission wire connector from the
transaxle.
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester ConnectionSpecified Condition
1 (THO) - 6 (E2)79 W to 156 kW
(c) Measure the resistance according to the value(s) in the
table below.
Standard (Check for short):
Tester ConnectionSpecified Condition
1 (THO) - Body ground10 kW or higher
6 (E2) - Body ground=
NG REPAIR OR REPLACE TRANSMISSION WIRE
(SEE PAGE 40-34)
OK

- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E/U140F)05-933
1123 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0711 TRANSMISSION FLUID TEMPERATURE
SENSOR ºAº PERFORMANCE
CIRCUIT DESCRIPTION
The ATF (Automatic Transmission Fluid) temperature sensor converts the fluid temperature into a resistance
value which is input into the ECM.
DTC No.DTC Detection ConditionTrouble Area
P0711
Both (a) and (b) are detected: (2-trip detection logic)
(a) Intake air and engine coolant temperatures are more than
-10°C (14F) at engine start
(b) After normal driving for over 18 min. and 9 km (6 mile) or
more, ATF temp. is less than 10°C (50F)

Open or short in ATF temperature sensor circuit

Transmission wire (ATF temperature sensor)

ECM
MONITOR DESCRIPTION
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 10C (50F) after running the vehicle for a certain period, the ECM interprets this as a fault, and
turns on the MIL.
When the ATF temperature is 110C (230F) or more after 17 minutes of engine cold start, the ECM also
determines this as a fault, turns on the MIL, and stores the DTC.
MONITOR STRATEGY
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
TYPICAL ENABLING CONDITIONS
The monitor will run whenever this DTC is not present.See page 05-895
Time after engine start16 min.and 40 sec. or more
ECT (Engine coolant temperature)-15C (5F) or more
TFT (transmission fluid temperature) sensor circuitNot circuit malfunction
ECT sensor circuitNot circuit malfunction
IAT (Intake air temperature) sensor circuitNot circuit malfunction
Time after engine start18 min. and 20 sec.
Driving distance after engine start9 km/h (5.6 mph)
IAT (12 sec. after engine start)-10C (14F) or more
ECT (12 sec. after engine start)-10C (14F) or more
TYPICAL MALFUNCTION THRESHOLDS
TFT (transmission fluid temperature)Less than 10C (50F)
COMPONENT OPERATING RANGE
TFT (transmission fluid temperature)Atmospheric temperature - approx. 130C (266F)
05F3A-05

- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E/U140F)05-935
1125 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
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 ºONº button of the OBD II scan tool or the hand-held tester.
(f) When you use hand-held tester:
Select the item ºDIAGNOSIS/ENHANCED OBD II/DATA LISTº.
(g) According to the display on tester, read the ºDATA LISTº.
ItemMeasurement Item/
Range (display)Normal Condition
AT FLUID TEMP
ATF Temp. Sensor Value/
min.: -40C (-40F)
max.: 215C (419F)
Approx. 80C (176F) (After Stall Test)
HINT:
When DTC P0712 is output and OBD II scan tool or hand-held tester output is 150C (302F), there is a
short circuit.
When DTC P0713 is output and OBD II scan tool or hand-held tester output is -40C (-40F), there is an
open circuit.
Measure the resistance between terminal THO1 (THO) and body ground.
Temperature DisplayedMalfunction
-40°C (-40°F)Open circuit
150°C (302°F) or moreShort 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.

05-944- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E/U140F)
1134 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0741 TORQUE CONVERTER CLUTCH SOLENOID
PERFORMANCE (SHIFT SOLENOID VALVE
DSL)
SYSTEM DESCRIPTION
The ECM uses the signals from the throttle position sensor, Air-flow meter, turbine (input) speed sensor,
intermediate (counter) shaft speed sensor and crankshaft position sensor to monitor the engagement condi-
tion of the lock-up clutch.
Then the ECM compares the engagement condition of the lock-up clutch with the lock-up schedule in the
ECM memory to detect a mechanical problems of the shift solenoid valve DSL, valve body and torque con-
verter clutch.
DTC No.DTC Detection ConditionTrouble Area
P0741
Lock-up does not occur when driving in lock-up range (normal
driving at 85 km/h [53 mph]), or lock-up remains ON in lock-
up OFF range (2-trip detection logic)

Shift solenoid valve DSL remains open or closed

Valve body is blocked

Shift solenoid valve DSL

Torque converter clutch

Automatic transaxle (clutch, brake or gear etc.)

Line pressure is too low

ECM
MONITOR DESCRIPTION
Torque converter lock-up is controlled by the ECM based on speed sensor (NT), speed sensor (NC), engine
rpm, engine load, engine temperature, vehicle speed, transmission temperature, and gear selection. The
ECM determines the lock-up status of the torque converter by comparing the engine rpm (NE) to the input
turbine rpm (NT). The ECM calculates the actual transmission gear by comparing input turbine rpm (NT) to
counter gear rpm (NC). When conditions are appropriate, the ECM requests ºlock-upº by applying control
voltage to shift solenoid DSL. When the DSL is turned on, solenoid DSL applies pressure to the lock-up relay
valve and locks the torque converter clutch.
If the ECM detects no lock-up after lock-up has been requested or if it detects lock-up when it is not re-
quested, the ECM interprets this as a fault in the shift solenoid valve DSL or lock-up system performance.
The ECM will turn on the MIL and store the DTC.
Example:
When any of the following is met, the system judges it as a malfunction.
(a) There is a difference in rotation between before and after torque converters even when the ECM com-
mands lock-up.
(Engine speed is at least 75 rpm greater than input turbine speed.)
(b) There is no difference in rotation between before and after torque converters even when the ECM com-
mands lock-up off.
(The difference between engine speed and input turbine speed is less than 35 rpm.)
05F3F-05

- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E/U140F)05-945
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: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
MONITOR STRATEGY
Related DTCs
P0741:
Shift solenoid valve DSL/OFF malfunction
Shift solenoid valve DSL/ON malfunction
Required sensors/Components
Shift solenoid valve DSL, Speed sensor (NT), Speed sensor (NC),Crankshaft posi-
tion sensor (NE), Throttle position sensor (VPA1), Mass air flow sensor (MAF),
Transmission temperature sensor (THO1), Engine coolant temperature sensor
(ECT)
Frequency of operationContinuous
Duration
OFF malfunction
3.5 sec.
ON malfunction
1.8 sec.
MIL operation2 driving cycles
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
ALL:
Transmission rangeºDº
ECT (Engine coolant temperature)60°C (140°F) or more
TFT (Transmission fluid temperature)-20C (-4F) or more
TFT sensor circuitNot circuit malfunction
ECT sensor circuitNot circuit malfunction
Turbine speed sensor circuitNot circuit malfunction
Intermediate shaft speed sensor circuitNot circuit malfunction
Output speed sensor circuitNot circuit malfunction
Shift solenoid valve SL1 circuitNot circuit malfunction
Shift solenoid valve SL2 circuitNot circuit malfunction
Shift solenoid valve S4 circuitNot circuit malfunction
Shift solenoid valve DSL circuitNot circuit malfunction
Electronic throttle systemNot circuit malfunction
OFF malfunction
ECM lock-up commandON
ECM selected gear3rd or 4th
Vehicle speed25 km/h (15.5 mph) or more
ON malfunction
ECM lock-up commandOFF
ECM selected gear3rd or 4th
Throttle valve opening angle8% or more
Vehicle speed25 to 60 km/h (15.5 to 37.2 mph)
TYPICAL MALFUNCTION THRESHOLDS
Either of the following conditions is met: OFF malfunction or ON malfunction
OFF malfunction
Engine speed - Input (turbine) speed100 rpm or more
ON malfunction
2 detections are necessary per driving cycle:
1st detection; temporary flag ON
2nd detection; pending fault code ON
Vehicle speed must be under 10 km/h (6.2 mph) once before 2nd detection
Diffierence between engine speed and input (turbine) speedLess than 35 rpm

A82401
64 to 88 km/h
(40 to 55 mph)
64 to 80 km/h
(40 to 50 mph)
Warm up time
(idle speed)4 minutes 16 minutes Ignition Switch OFFIdling
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
2. CATALYST MONITOR (A/F SENSOR TYPE)
(a) Preconditions
The monitor will not run unless:

The MIL is OFF.

Engine Coolant Temperature (ECT) is 75°C (167°F) or higher.

Intake Air Temperature (IAT) is -10°C (14°F) or higher.*
NOTICE:
* 2002 and later MY vehicles:
To complete the readiness test in cold ambient conditions (less than -10°C/14°F), turn the ignition
switch OFF and then back to ON. Perform the drive pattern a second time.
(b) Drive Pattern
(1) Connect the OBD II scan tool to the DLC3 to check readiness monitor status and preconditions
(refer to step (a)).
(2) Drive the vehicle at 40 to 55
mph (64 to 88 km/h) for approximately 4 minutes.
NOTICE:
Drive with smooth throttle operation and avoid sudden acceleration.
If IAT was less than 10°C (50°F) when the engine was started, drive the vehicle at 40 to 55 mph (64
to 88 km/h) for an additional 4 minutes.
(3) Drive the vehicle allowing speed to fluctuate between 40 to 50 mph (64 to 80 km/h) for about 16
minutes.
NOTICE:
Drive with smooth throttle operation and avoid sudden closure of the throttle.
(4) Check the status of the readiness monitor on the scan tool display. If the readiness monitor status
did not switch to complete, ensure preconditions are met, turn the ignition OFF, and then repeat
steps (2) and (3).

A82400
112 km/h (70 mph)
(under 3200 rpm)
64 km/h (40 mph)
(over 1400 rpm)
40 km/h (25 mph)
(over 900 rpm)
Idling
Ignition Switch OFFOnce Twice 10 times
Over
2 minutesOver
150 secondsOver
40 secondsOver
40 secondsOver
40 seconds
Over
10 secondsOver
10 secondsOver
10 seconds
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-29
219 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
4. OXYGEN / AIR FUEL RATIO SENSOR MONITOR (FRONT A/F SENSOR AND REAR O2S SYSTEM)
(a) Preconditions
The monitor will not run unless:
The MIL is OFF.
(b) Drive Pattern
(1) Connect the OBD II scan tool to the DLC3 to check monitor status and preconditions (refer to
step (a)).
(2) Start the engine and allow it to idle for 2 minutes or more.
(3) Drive the vehicle at 64 to 112 km/h (40 to 70 mph) for at least 150 seconds.
(4) Stop the vehicle and allow the engine to idle for 10 seconds or more.
(5) Drive the vehicle at 40 to 64 km/h (25 to 40 mph) for at least 40 seconds.
(6) Stop the vehicle and allow the engine to idle for 10 seconds or more.
(7) Perform steps (5) and (6) ten times.
(8) Check the readiness monitor status. If the readiness monitor status did not change to ºcompleteº,
check the preconditions, turn the ignition switch OFF, and repeat steps (1) to (6).

A78886
Idling
Ignition Switch OFF40 km/h
(25 mph)
Over 2 minutes Over 500 seconds 05-30
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
220 Author
: Date
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
5. OXYGEN / A/F SENSOR HEATER MONITOR
(a) Preconditions
The monitor will not run unless:
The MIL is OFF.
(b) Drive Pattern
(1) Connect the OBD II scan tool to the DLC3 to check monitor status and preconditions (refer to
step (a)).
(2) Start the engine and allow it to idle for 500 seconds
or more.
(3) Drive the vehicle at 40 km/h (25 mph) or more for at least 2 minutes.
(4) Check the readiness monitor status. If the readiness monitor status did not change to ºcompleteº,
check preconditions, turn the ignition switch OFF, and repeat steps (2) and (3).