o2 sensor TOYOTA HIGHLANDER 2001 Service Repair Manual

- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E/U140F)05-953
1143 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0748 PRESSURE CONTROL SOLENOID ºAº
ELECTRICAL (SHIFT SOLENOID VALVE
SL1)
CIRCUIT DESCRIPTION
Shifting from 1st to O/D is performed in combination with ºONº and ºOFFº operation of the shift solenoid
valves SL1 and SL2 which is controlled by the ECM. If an open or short circuit occurs in either of the shift
solenoid valves, the ECM controls the remaining normal shift solenoid valve to allow the vehicle to be oper-
ated smoothly (Fail safe function).
DTC No.DTC Detection ConditionTrouble Area
P0748
ECM checks for an open or short circuit in shift solenoid valves
SL1 (1-trip detection logic)

Output signal duty equals to 100%
Open or short in shift solenoid valve SL1 circuit

Shift solenoid valve SL1

ECM
MONITOR DESCRIPTION
The ECM commands gear shifts by turning the shift solenoid valves ºON/OFFº. When there is an open or
short circuit in any shift solenoid valve circuit, the ECM detects the problem and illuminates the MIL and
stores the DTC. And the ECM performs the fail-safe function and turns the other shift solenoid valves in good
condition ºON/OFFº (In case of an open or short circuit, the ECM stops sending current to the circuit.)
(see page 05-916).
MONITOR STRATEGY
Related DTCsP0748: Shift solenoid valve SL1/Range check
Required sensors/ComponentsShift solenoid valve SL1
Frequency of operationContinuous
Duration1 sec.
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
The monitor will run whenever this DTC is not present.See page 05-895
Battery voltage10 V or more
Ignition switchON
StarterOFF
TYPICAL MALFUNCTION THRESHOLDS
Output signal duty100%
COMPONENT OPERATING RANGE
Output signal dutyLess than 100%
05C10-19

05-956- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E/U140F)
1146 Author
: Date
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0766 SHIFT SOLENOID ºDº PERFORMANCE
(SHIFT SOLENOID VALVE S4)
SYSTEM DESCRIPTION
The ECM uses signals from the vehicle speed sensor to detect the actual gear position (1st, 2nd, 3rd or O/D
gear).
Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical
problems of the shift solenoid valves and valve body.
DTC No.DTC Detecting ConditionTrouble Area
P0766The gear required by the ECM does not match the actual gear
when driving (2-trip detection logic)

Shift solenoid valve S4 remains open or closed

Valve body is blocked

Shift solenoid valve S4

Automatic transaxle (clutch, brake or gear etc.)

ECM
MONITOR DESCRIPTION
The ECM commands gear shifts by turning the shift solenoid valves ºON/OFFº. According to the input shaft
revolution, intermediate (counter) shaft revolution and output shaft revolution, the ECM detects the actual
gear position (1st, 2nd, 3rd or O/D gear position). When the gear position commanded by the ECM and the
actual gear position are not same, the ECM illuminates the MIL and stores the DTC.
MONITOR STRATEGY
Related DTCs
P0766:
Shift solenoid valve S4/ON malfunction
Shift solenoid valve S4/OFF malfunction
Required sensors/ComponentsShift solenoid valve S4, Speed sensor (NT), Speed sensor (NC), Crankshaft posi-
tion sensor (NE)
Frequency of operationContinuous
Duration1 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
Electronic throttle systemNot circuit malfunction
05C11-19

05-1072- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U151E/U151F)
1262 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0771 SHIFT SOLENOID ºEº PERFORMANCE
(SHIFT SOLENOID VALVE SR)
SYSTEM DESCRIPTION
The ECM uses signals from the vehicle speed sensor to detect the actual gear position (1st, 2nd, 3rd, 4th
or 5th gear).
Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical
problems of the shift solenoid valves and valve body.
DTC No.DTC Detecting ConditionTrouble Area
P0771The gear required by the ECM does not match the actual gear
when driving (2-trip detection logic)

Shift solenoid valve SR remains open or closed

Valve body is blocked

Shift solenoid valve SR

Automatic transaxle (clutch, brake or gear etc.)

ECM
MONITOR DESCRIPTION
The ECM commands gear shifts by turning the shift solenoid valves ºON/OFFº. According to the input shaft
revolution, intermediate (counter) shaft revolution and output shaft revolution, the ECM detects the actual
gear position (1st, 2nd, 3rd, 4th or 5th gear position). When the gear position commanded by the ECM and
the actual gear position are not same, the ECM illuminates the MIL and stores the DTC.
MONITOR STRATEGY
Related DTCsP0771: Shift solenoid valve SR/Rationality check
Required sensors/ComponentsShift solenoid valve SR, Speed sensor (NT), Speed sensor (NC), Crankshaft posi-
tion sensor (NE)
Frequency of operationContinuous
Duration
OFF malfunction (A)
1 sec.
OFF malfunction (B)
3.5 sec.
ON malfunction (A)
Continuous
ON malfunction (B) and (C)
0.8 sec.
MIL operation2 driving cycles
Sequence of operationNone
05C12-12

- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U151E/U151F)05-1073
1263 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
TYPICAL ENABLING CONDITIONS
All:
Transmission rangeºDº
ECT (Engine coolant temperature)10C (50F) 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 SL3 circuitNot circuit malfunction
Shift solenoid valve S4 circuitNot circuit malfunction
Shift solenoid valve SR circuitNot circuit malfunction
Shift solenoid valve DSL circuitNot circuit malfunction
OFF malfunction (A)
ECM selected gear5th
Throttle valve opening angle5% or more
Vehicle speed10 km/h (6.2 mph) or more
OFF malfunction (B)
ECM lock-up commandON
ECM selected gear3rd, 4th or 5th
Vehicle speed25 km/h (15.5 mph)
ON malfunction (A)
ECM lock-up commandOFF
ON malfunction (B)
ECM selected gear1st
Vehicle speedLess than 40 km/h (24.9 mph)
Throttle valve opening angle4.5% or more at engine speed 1,900 rpm
(Varies with engine speed)
ON malfunction (C)
ECM selected gear3rd
Throttle valve opening angle4.5% or more at engine speed 1,900 rpm
(Varies with engine speed)
ON malfunction (D)
ECM selected gear4th or 5th
Duration time from shift command of ECM15 sec. or more

05-960- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E/U140F)
1150 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0776 PRESSURE CONTROL SOLENOID ºBº
PERFORMANCE (SHIFT SOLENOID VALVE
SL2)
SYSTEM DESCRIPTION
The ECM uses signals from the vehicle speed sensor to detect the actual gear position (1st, 2nd, 3rd or O/D
gear).
Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical
problems of the shift solenoid valves and valve body.
DTC No.DTC Detecting ConditionTrouble Area
P0776The gear required by the ECM does not match the actual gear
when driving (2-trip detection logic)

Shift solenoid valve SL2 remains open or closed

Valve body is blocked

Shift solenoid valve SL2

Automatic transaxle (clutch, brake or gear etc.)

ECM
MONITOR DESCRIPTION
The ECM commands gear shifts by turning the shift solenoid valves ºON/OFFº. According to the input shaft
revolution, intermediate (counter) shaft revolution and output shaft revolution, the ECM detects the actual
gear position (1st, 2nd, 3rd or O/D gear position). When the gear position commanded by the ECM and the
actual gear position are not same, the ECM illuminates the MIL and stores the DTC.
MONITOR STRATEGY
Related DTCs
P0776:
Shift solenoid valve SL2/OFF malfunction
Shift solenoid valve SL2/ON malfunction
Required sensors/ComponentsShift solenoid valve SL2, Speed sensor (NT), Speed sensor (NC), Crankshaft posi-
tion sensor (NE)
Frequency of operationContinuous
Duration0.8 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
Electronic throttle systemNot circuit malfunction
05C13-17

05-964- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E/U140F)
1154 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0778 PRESSURE CONTROL SOLENOID ºBº
ELECTRICAL (SHIFT SOLENOID VALVE
SL2)
CIRCUIT DESCRIPTION
Shifting from 1st to O/D is performed in combination with ºONº and ºOFFº operation of the shift solenoid
valves SL1 and SL2 which is controlled by the ECM. If an open or short circuit occurs in either of the shift
solenoid valves, the ECM controls the remaining normal shift solenoid valve to allow the vehicle to be oper-
ated smoothly (Fail safe function).
DTC No.DTC Detection ConditionTrouble Area
P0778
ECM checks for an open or short circuit in shift solenoid valves
SL2 (1-trip detection logic)

Output signal duty equals to 100%
Open or short in shift solenoid valve SL2 circuit

Shift solenoid valve SL2

ECM
MONITOR DESCRIPTION
The ECM commands gear shifts by turning the shift solenoid valves ºON/OFFº. When there is an open or
short circuit in any shift solenoid valve circuit, the ECM detects the problem and illuminates the MIL and
stores the DTC. And the ECM performs the fail-safe function and turns the other shift solenoid valves in good
condition ºON/OFFº (In case of an open or short circuit, the ECM stops sending current to the circuit.)
(see page 05-916).
MONITOR STRATEGY
Related DTCsP0778: Shift solenoid valve SL2/Range check
Required sensors/ComponentsShift solenoid valve SL2
Frequency of operationContinuous
Duration1 sec.
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
The monitor will run whenever this DTC is not present.See page 05-895
Battery voltage10 V or more
Ignition switchON
StarterOFF
TYPICAL MALFUNCTION THRESHOLDS
Output signal duty100%
COMPONENT OPERATING RANGE
Output signal dutyLess than 100%
05C14-17

GND
C93866
1 V/DIV
1 ms/DIV
- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E/U140F)05-967
1157 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0793 INTERMEDIATE SHAFT SPEED SENSOR
ºAº
CIRCUIT DESCRIPTION
This sensor detects the rotation speed of the counter gear. By comparing the counter gear speed signal (NC)
with the direct clutch speed sensor signal (NT), the ECM detects the shift timing of the gears and appropriate-
ly controls the engine torque and hydraulic pressure according to various conditions. Thus smooth gear shift-
ing is performed.
DTC No.DTC Detection ConditionTrouble Area
P0793
ECM detects conditions (a), (b) and (c) continuity for 5 sec. or
more: (1-trip detection logic)
(a) Vehicle speed: 50 km/h (31 mph) or more
(b) Park/neutral position switch (NSW) is OFF
(c) Speed sensor (NC): less than 300 rpm
Open or short in transmission revolution sensor NC (speed
sensor NC) circuit

Transmission revolution sensor NC (speed sensor NC)

ECM
Reference (Using an oscilloscope):
Check the waveform between the terminals NC+ and
NC- of the ECM connector.
Standard: Refer to the illustration.
TerminalNC+ - NC-
Tool setting1V/DIV, 1ms/DIV
Vehicle conditionVehicle speed 30 km/h (19 mph): (3rd gear)
Engine speed 1,400 rpm
MONITOR DESCRIPTION
The NC terminal of ECM detects a revolution signal from the speed sensor (NC) (counter gear rpm). The
ECM calculates a gearshift comparing the speed sensor (NT) with the speed sensor (NC).
While the vehicle is operating in 2nd, 3rd or O/D gear in the shift position of D, if the counter gear revolution
is less than 300 rpm
*1 although the output shaft revolution is more than 1,000 rpm*2, the ECM detects the
trouble, illuminates the MIL and stores the DTC.
*1: Pulse is not output or is irregularly output.
*2: The vehicle speed is 50 km/h (31 mph) or more.
MONITOR STRATEGY
Related DTCsP0793: Speed sensor (NC)/Verify pulse input
Required sensors/ComponentsSpeed sensor (NC), Speed sensor (NT), NSW switch
Frequency of operationContinuous
Duration5 sec.
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
The monitor will run whenever this DTC is not present.See page 05-895
EngineRunning
NSW switchOFF
Output shaft rpm1,000 rpm or more
05F3D-05

G31763
ECM
NC+
NC-
E8 34 26
Y
W-G 2 1 C6
Counter Gear Speed Sensor
E8
E1 5V 05-968
- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E/U140F)
1158 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
TYPICAL MALFUNCTION THRESHOLDS
Sensor signal rpmLess than 300 rpm
COMPONENT OPERATING RANGE
Counter gear speed sensor (NC)
[HINT]
4th (O/D) when shift lever position is D position (After warming up the engine);

Intermediate shaft speed (NC) becomes close to the engine speed.
WIRING DIAGRAM

BR3795OK NG
- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E/U140F)05-969
1159 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
SPD (NC)Counter Gear Speed/
display: 50 r/min
[HINT]
4th (O/D) when shift lever position is D position
(After warming up the engine);

Intermediate shaft speed (NC) becomes close
to the engine speed.
HINT:

SPD (NC) is always 0 while driving:
Open or short in the sensor or circuit.

SPD (NC) is always more than 0 and less than 300 rpm while driving the vehicle at 50 km/h (31 mph)
or more:
Sensor trouble, improper installation, or intermittent connection trouble of the circuit.
1 INSPECT SPEED SENSOR INSTALLATION
(a) Check the speed sensor installation.
OK:
The installation bolt is tightened properly and there is
no clearance between the sensor and transaxle case.
NG REPLACE SPEED SENSOR(NC)
OK

C58536
1 2
Sensor Side:
(Connector Front View):
C6
C82158C91565
NC+
NC-
E7E8E9E6E5
ECM:
05-970- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E/U140F)
1160 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
2 INSPECT SPEED SENSOR(NC)
(a) Disconnect the speed sensor connector from the trans-
axle.
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
TOYOTA made:
Tester ConnectionSpecified Condition
20 C (68 F)
1 - 2500 to 620 W
Standard:
AISIN made:
Tester ConnectionSpecified Condition
20 C (68 F)
1 - 2560 to 680 W
NG REPLACE SPEED SENSOR(NC)
OK
3 CHECK HARNESS AND CONNECTOR(SPEED SENSOR - ECM)
(a) Connect the speed sensor connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the
table below.
Standard:
TOYOTA made:
Tester ConnectionSpecified Condition
20 C (68 F)
E8 - 26 (NC+) - E8 - 34 (NC-)500 to 620 W
Standard:
AISIN made:
Tester ConnectionSpecified Condition
20 C (68 F)
E8 - 26 (NC+) - E8 - 34 (NC-)560 to 680 W
(d) Measure the resistance according to the value(s) in the
table below.
Standard (Check for short):
Tester ConnectionSpecified Condition
E8 - 26 (NC+) - Body ground10 kW or higher
E8 - 34 (NC-) - Body ground=
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR (SEE PAGE 01-36)
OK
REPLACE ECM (SEE PAGE 10-9)