2001 TOYOTA SEQUOIA O2 sensor

± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±601
795 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM
See page DI±283.
INSPECTION PROCEDURE
1 Read value of DATA LIST (STP signal).
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 the hand±held tester:
Select the item ºDIAGNOSIS / ENHANCED OBD II / DATA LISTº.
(g) According to the display on the tester, read the ºDATA LISTº.
Standard:
ItemMeasurement Item/
Range (display)Normal Condition
Stop Light SwitchStop light SW Status/
ON or OFF
Brake Pedal is depressed: ON

Brake Pedal is released: OFF
NOTICE:
In the table above, the conditions listed under ºNormal Conditionº are reference conditions. Do not
depend solely on these reference conditions when deciding whether a part is faulty or not.
OK:
Brake Pedal ConditionSpecified Condition
DepressedON
ReleasedOFF
NG Go to step 2.
OK
Go to step 3.

± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±603
797 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P0748 Pressure Control Solenoid ºAº Electrical
(Shift Solenoid Valve SL1)
CIRCUIT DESCRIPTION
Shifting from 1st to 5th is performed in combination with ºONº and ºOFFº operation of the shift solenoid valves
SL1, SL2, S1, S2 and SR which are 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 valves to allow the vehicle to be
operated smoothly (See page DI±567).
DTC No.DTC Detection ConditionTrouble Area
P0748
ECM checks for an open or short circuit in shift solenoid valves
SL1 (1±trip detection logic)
(a) When solenoid, duty ratio equal to 100%
(b) When solenoid is not energized, duty ratio is less than 3%
Open or short in shift solenoid valve SL1 circuit

Shift solenoid valve SL1

ECM
MONITOR DESCRIPTION
This DTC indicates an open or short in the shift solenoid valve SL1 circuit. The ECM commands gearshift
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 per-
forms the fail±safe function and turns the other normal shift solenoid valves ºON/OFFº. (In case of an open
or short circuit, the ECM stops sending current to the circuit.)
While driving and shifting between 4th and 5th gears, if the ECM detects an open or short in the shift solenoid
valve SL1 circuit, the ECM determines there is a malfunction (See page DI±567).
MONITOR STRATEGY
Related DTCsP0748Shift solenoid valve SL1/Range check
Required sensors/ComponentsShift solenoid valve SL1
Frequency of operationContinuous
Duration1 sec.
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever this DTC is
not present.See page DI±545
Battery voltage10 V or more±
CPU commanded duty±Less than 75%
Ignition switchON
SwitchOFF
TYPICAL MALFUNCTION THRESHOLDS
Detection criteriaThreshold
Output signal duty100%
DIDJB±01

DI±608
± DIAGNOSTICSAUTOMATIC TRANSMISSION
802 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P0751 Shift Solenoid ºAº Performance
(Shift Solenoid Valve S1)
SYSTEM DESCRIPTION
The ECM uses signals from the output shaft speed sensor and input 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, valve body or automatic transmission (clutch, brake or gear, etc.).
DTC No.DTC Detection ConditionTrouble Area
P0751The gear required by the ECM does not match the actual gear
when driving (2±trip detection logic)
Shift solenoid valve S1 remains open or closed

Valve body is blocked

Automatic transmission (clutch, brake or gear, etc.)
MONITOR DESCRIPTION
This DTC indicates ºstuck ON malfunctionº or ºstuck OFF malfunctionº of the shift solenoid valve S1.
The ECM commands gear shifts by turning the shift solenoid valves ºON/OFFº. When the gear position com-
manded by the ECM and the actual gear position are not the same, the ECM illuminates the MIL and stores
the DTC.
MONITOR STRATEGY
RltdDTCP0751Shift solenoid valve S1/OFF malfunctionRelated DTCsP0751Shift solenoid valve S1/ON malfunction
MainShift solenoid valve S1
Required sensors/ComponentsSubVehicle speed sensor, Throttle position sensor, Speed sensor (NT), Speed
sensor (NO)
Frequency of operationContinuous
OFF malfunction (A) and (B)0.4 sec.
OFF malfunction (C)Immediate
DurationON malfunction (A), (B) and
(C)0.4 sec.
ON malfunction (D)3 sec.
ON malfunction (E)0.5 sec.
MIL operation2 driving cycles
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
All:
Turbine speed sensor circuitNot circuit malfunction
Output speed sensor circuitNot circuit malfunction
Shift solenoid valve S1 circuitNot circuit malfunction
Shift solenoid valve S2 circuitNot circuit malfunction
Shift solenoid valve SR circuitNot circuit malfunction
Shift solenoid valve SL1 circuitNot circuit malfunction
DIDJC±01

± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±609
803 Author: Date:
2005 SEQUOIA (RM1146U) Shift solenoid valve SL2 circuit
Not circuit malfunction
ECT (Engine coolant temperature) sensor
circuitNot circuit malfunction
KCS sensor circuitNot circuit malfunction
ETCS (Electric throttle control system)Not system down
Transmission rangeºDº
ECT40°C (104°F) or more±
Spark advance from Max. retard timing by
KCS control0° CA or more±
EngineStarting
Transfer rangeºHIGHº*1
Transfer range ºHIGHº *1 (This condition is applied only 4WD)
*1 Following conditions met
Vehicle speed sensor circuitNot circuit malfunction
Output shaft speed sensor circuitNot circuit malfunction
Transfer output speed143 rpm or more±
NO/NOtf (Transfer input speed/Transfer
output speed)0.9 to 1.1
OFF malfunction (A)
ECM selected gear1st
Vehicle speed2 to 40 km/h (1.2 to 24.9 mph)
Throttle valve opening angle
8% or more
and 7.0% or more at 2,000 rpm
(Conditions vary with engine speed)
±
OFF malfunction (B)
Current ECM selected gear5th
Last ECM selected gear4th
Continuous time for ECM selecting 4th
gear2 sec. or more±
Actual gear when ECM selected 4th gear4th
OFF malfunction (C)
Current ECM selected gear5th
Last ECM selected gear4th
ON malfunction (A)
ECM selected gear1st
Vehicle speed2 to 40 km/h (1.2 to 24.9 mph)
Throttle valve opening angle7.0% or more at 2,000 rpm
(Conditions vary with engine speed)±
ON malfunction (B)
ECM selected gear4th
Vehicle speed2 km/h (1.2 mph) or more±
Throttle valve opening angle7.0% or more at 2,000 rpm
(Conditions vary with engine speed)±
ON malfunction (C)
ECM selected gear3rd
Vehicle speed2 km/h (1.2 mph) or more±

DI±614
± DIAGNOSTICSAUTOMATIC TRANSMISSION
808 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P0756 Shift Solenoid ºBº Performance
(Shift Solenoid Valve S2)
SYSTEM DESCRIPTION
The ECM uses signals from the output shaft speed sensor and input 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, valve body or automatic transmission (clutch, brake or gear, etc.).
DTC No.DTC Detection ConditionTrouble Area
P0756The gear required by the ECM does not match the actual gear
when driving (2±trip detection logic)
Shift solenoid valve S2 remains open or closed

Valve body is blocked

Automatic transmission (clutch, brake or gear, etc.)
MONITOR DESCRIPTION
This DTC indicates ºstuck ON malfunctionº or ºstuck OFF malfunctionº of the shift solenoid valve S2.
The ECM commands gear shifts by turning the shift solenoid valves ºON/OFFº. When the gear position com-
manded by the ECM and the actual gear position are not the same, the ECM illuminates the MIL and stores
the DTC.
MONITOR STRATEGY
RltdDTCP0756Shift solenoid valve S2/OFF malfunctionRelated DTCsP0756Shift solenoid valve S2/ON malfunction
MainShift solenoid valve S2
Required sensors/ComponentsSubVehicle speed sensor, Throttle position sensor, Speed sensor (NT), Speed
sensor (NO)
Frequency of operationContinuous
OFF malfunction (A), (B), (C)0.4 sec.
OFF malfunction (D)Immediate
DurationON malfunction (A) and (B)0.4 sec.Duration
ON malfunction (C)3 sec.
ON malfunction (D)0.5 sec.
MIL operation2 driving cycles
Sequence of operationNone
DIDJD±01

± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±615
809 Author: Date:
2005 SEQUOIA (RM1146U)
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
All:
Turbine speed sensor circuitNot circuit malfunction
Output speed sensor circuitNot circuit malfunction
Shift solenoid valve S1 circuitNot circuit malfunction
Shift solenoid valve S2 circuitNot circuit malfunction
Shift solenoid valve SR circuitNot circuit malfunction
Shift solenoid valve SL1 circuitNot circuit malfunction
Shift solenoid valve SL2 circuitNot circuit malfunction
ECT (Engine coolant temperature) sensor
circuitNot circuit malfunction
KCS sensor circuitNot circuit malfunction
ETCS (Electric throttle control system)Not system down
Transmission rangeºDº
ECT40°C (104°F) or more±
Spark advance from Max. retard timing by
KCS control0° CA or more±
EngineStarting
Transfer rangeºHIGHº*1
Transfer range ºHIGHº *1 (This condition is applied only 4WD)
*1 Following conditions met
Vehicle speed sensor circuitNot circuit malfunction
Output shaft speed sensor circuitNot circuit malfunction
Transfer output speed143 rpm or more±
NO/NOtf (Transfer input speed/Transfer
output speed)0.9 to 1.1
OFF malfunction (A)
ECM selected gear1st
Vehicle speed2 to 40 km/h (1.2 to 24.9 mph)
Throttle valve opening angle7.0% or more at 2,000 rpm
(Conditions vary with engine speed)±
OFF malfunction (B)
ECM selected gear2nd
Vehicle speed2 km/h (1.2 mph) or more±
Output speed2nd " 1st down shift point or more±
Throttle valve opening angle7.0% or more at 2,000 rpm
(Conditions vary with engine speed)±
OFF malfunction (C)
Current ECM selected gear5th
Last ECM selected gear4th
Continuous time for ECM selecting 4th
gear2 sec. or more±
Actual gear when ECM selected 4th gear4th
OFF malfunction (D)
Current ECM selected gear5th

DI±620
± DIAGNOSTICSAUTOMATIC TRANSMISSION
814 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P0771 Shift Solenoid ºEº Performance
(Shift Solenoid Valve SR)
SYSTEM DESCRIPTION
The ECM uses signals from the output shaft speed sensor and input 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, valve body or automatic transmission (clutch, brake or gear, etc.).
DTC No.DTC Detection 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

Shift solenoid valve SL1 remains open or closed

Valve body is blocked

Automatic transmission (clutch, brake or gear, etc.)
MONITOR DESCRIPTION
This DTC indicates ºstuck ON malfunctionº or ºstuck OFF malfunctionº of the shift solenoid valve SR or SL1.
The ECM commands gear shifts by turning the shift solenoid valves ºON/OFFº. When the gear position com-
manded by the ECM and the actual gear position are not the same, the ECM illuminates the MIL and stores
the DTC.
MONITOR STRATEGY
Related DTCsP0771Shift solenoid valve SR/Rationality check
Rid /C tMainShift solenoid valve SRRequired sensors/ComponentsSubSpeed sensor (NT), Speed sensor (NO), Crankshaft position sensor (NE)
Frequency of operationContinuous
OFF malfunction (A)0.4 sec.
DurationOFF malfunction (B) and (C)ImmediateDuration
ON malfunction0.15 sec.
MIL operation2 driving cycles
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
All:
Turbine speed sensor circuitNot circuit malfunction
Output speed sensor circuitNot circuit malfunction
Shift solenoid valve S1 circuitNot circuit malfunction
Shift solenoid valve S2 circuitNot circuit malfunction
Shift solenoid valve SR circuitNot circuit malfunction
Shift solenoid valve SL1 circuitNot circuit malfunction
Shift solenoid valve SL2 circuitNot circuit malfunction
ECT (Engine coolant temperature) sensor
circuitNot circuit malfunction
KCS sensor circuitNot circuit malfunction
DIDJE±01

± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±621
815 Author: Date:
2005 SEQUOIA (RM1146U) ETCS (Electric throttle control system)
Not system down
Transmission rangeºDº
ECT40°C (104°F) or more±
Spark advance from Max. retard timing by
KCS control0° CA or more±
EngineStarting
Transfer rangeºHIGHº*1
Transfer range ºHIGHº *1 (This condition is applied only 4WD)
*1 Following conditions met
Vehicle speed sensor circuitNot circuit malfunction
Output shaft speed sensor circuitNot circuit malfunction
Transfer output speed143 rpm or more±
NO/NOtf (Transfer input speed/Transfer
output speed)0.9 to 1.1
OFF malfunction (A)
ECM selected gear5th
Vehicle speed2 km/h (1.2 mph) or more±
Throttle valve opening angle7.0% or more at 2,000 rpm
(Conditions vary with engine speed)±
OFF malfunction (B)
Current ECM selected gear5th
Last ECM selected gear4th
Continuous time for ECM selecting 4th
gear2 sec. or more±
OFF malfunction (C)
Current ECM selected gear5th
Last ECM selected gear4th
ON malfunction
Current ECM selected gear2th
Last ECM selected gear1st
Throttle valve opening angle
(During transition from 1st to 2nd gear)6.0% or more at 3,000 rpm
(Conditions vary with engine speed)±
TYPICAL MALFUNCTION THRESHOLDS
Detection criteriaThreshold
[OFF malfunction]
All of the following conditions are met: OFF malfunctions (A), (B) and (C)
2 detections are necessary per driving cycle
1st detection; temporary flag ON
2nd detection; temporary pending fault code ON
OFF malfunction (A)
Turbine speed/Output speed0.93 to 1.07
OFF malfunction (B)
Turbine speed/Output speed
Not change as follow
0.93 to 1.07
O
0.65 to 0.79