2001 TOYOTA SEQUOIA O2 sensor

± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±625
819 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P0776 Pressure Control Solenoid ºBº Performance
(Shift Solenoid Valve SL2)
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
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
Automatic transmission (clutch, brake or gear, etc.)
MONITOR DESCRIPTION
This DTC indicates ºstuck ON malfunctionº or ºstuck OFF malfunctionº of the shift solenoid valve SL2.
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 DTCsP0776Shift solenoid valve SL2/ON malfunction
Rid /C tMainShift solenoid valve SL2Required sensors/ComponentsSubSpeed sensor (NT), Speed sensor (NO), Crankshaft position sensor (NE)
Frequency of operationContinuous
ON malfunctions (A), (B) and
(C)0.4 sec.
DurationON malfunction (D)3 sec.
ON malfunction (E)0.5 sec.
MIL operation2 driving cycles
Sequence of operationNone
DIDJF±01

DI±626
± DIAGNOSTICSAUTOMATIC TRANSMISSION
820 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
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 gear3rd
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 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 (D)
Current ECM selected gear5th
Last ECM selected gear4th

± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±631
825 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P0778 Pressure Control Solenoid ºBº Electrical
(Shift Solenoid Valve SL2)
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
P0778
The ECM checks for an open or short in the shift solenoid
valve SL2 circuit while driving and shifting gears. (1±trip detec-
tion logic)

Output signal duty equals to 100%.
(NOTE: SL2 output signal duty is less than 100% under nor-
mal condition.)

Open or short in shift solenoid valve SL2 circuit

Shift solenoid valve SL2

ECM
MONITOR DESCRIPTION
This DTC indicates an open or short in the shift solenoid valve SL2 circuit. The ECM commands gear shift
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 gears, if the ECM detects an open or short in the shift solenoid valve SL2 circuit,
the ECM determines there is a malfunction (See page DI±567).
MONITOR STRATEGY
Related DTCsP0778Shift solenoid valve SL2/Range check
Required sensors/ComponentsShift solenoid valve SL2
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
StarterOFF
TYPICAL MALFUNCTION THRESHOLDS
Detection criteriaThreshold
Output signal duty100%
DIDJG±01

D14169
1±2 Shift Valve
Valve Body:
DI±636
± DIAGNOSTICSAUTOMATIC TRANSMISSION
830 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P0781 1±2 Shift (1±2 Shift Valve)
SYSTEM DESCRIPTION
The 1±2 shift valve performs shifting to 1st gear and other
gears.
DTC No.DTC Detection ConditionTrouble Area
P0781The gear required by the ECM does not match the actual gear
when driving (2±trip detection logic)
Valve body is blocked up or stuck (1±2 shift valve)

Automatic transmission (clutch, brake or gear, etc.)
MONITOR DESCRIPTION
This DTC indicates that the 1±2 shift valve in the valve body is locked in the direction the spring compresses.
The ECM commands gear shifts by turning the shift solenoid valves ºON/OFFº and switching oil pressure
to the valves in the valve body.
The ECM calculates the ºactualº transmission gear by comparing the signals from the input speed sensor
(NCO) and the output speed sensor (SP2). The ECM can detect many mechanical problems in the shift sole-
noids, valve body, and the transmission clutches, brakes, and gears. If the ECM detects that the actual gear
position and the commanded gear position are different, it will illuminate the MIL and store the DTC .
MONITOR STRATEGY
Related DTCsP0781Valve body/Rationality check
MainValve body
Required sensors/ComponentsSubAutomatic transmission assembly, Speed sensor (NT), Speed sensor
(NO), Vehicle speed sensor, Throttle speed sensor
Frequency of operationContinuous
Conditions (A) and (B)0.4 sec.
DurationCondition (C)3 sec.Duration
Condition (D)0.5 sec.
MIL operation2 driving cycles
Sequence of operationNone
DIDJH±01

± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±637
831 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
Condition (A)
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)±
Condition (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)±
Condition (C)
Current ECM selected gear5th
Last ECM selected gear4th
Vehicle speed
(During transition from 4th to 5th gear)±Less than 100 km/h (62.2 mph)
Condition (D)
ECM selected gear5th

± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±641
835 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P0973 Shift Solenoid ºAº Control Circuit Low
(Shift Solenoid Valve S1)
DTC P0974 Shift Solenoid ºAº Control Circuit High
(Shift Solenoid Valve S1)
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
P0973ECM detects short in solenoid valve S1 circuit 2 times when
solenoid valve S1 is operated (1±trip detection logic)
Short in shift solenoid valve S1 circuit

Shift solenoid valve S1

ECM
P0974ECM detects open in solenoid valve S1 circuit 2 times when
solenoid valve S1 is not operated (1±trip detection logic)
Open in shift solenoid valve S1 circuit

Shift solenoid valve S1

ECM
MONITOR DESCRIPTION
These DTCs indicate an open or short in the shift solenoid valve S1 circuit. 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. When the shift solenoid valve S1 is on, if resistance is 8 W or less, the ECM determines there is
a short in the shift solenoid valve S1 circuit.
When the shift solenoid valve S1 is off, if resistance is 100 kW or more, the ECM determines there is an open
in the shift solenoid valve S1 circuit (See page DI±567).
MONITOR STRATEGY
RltdDTCP0973Shift solenoid valve S1/Range check (Low resistance)Related DTCsP0974Shift solenoid valve S1/Range check (High resistance)
Required sensors/ComponentsShift solenoid valve S1
Frequency of operationContinuous
Duration0.064 sec.
MIL operationImmediate
Sequence of operationNone
DIDJI±01

DI±646
± DIAGNOSTICSAUTOMATIC TRANSMISSION
840 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P0976 Shift Solenoid ºBº Control Circuit Low
(Shift Solenoid Valve S2)
DTC P0977 Shift Solenoid ºBº Control Circuit High
(Shift Solenoid Valve S2)
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
P0976ECM detects short in solenoid valve S2 circuit 2 times when
solenoid valve S2 is operated (1±trip detection logic)
Short in shift solenoid valve S2 circuit

Shift solenoid valve S2

ECM
P0977ECM detects open in solenoid valve S2 circuit 2 times when
solenoid valve S2 is not operated (1±trip detection logic)
Open in shift solenoid valve S2 circuit

Shift solenoid valve S2

ECM
MONITOR DESCRIPTION
These DTCs indicate an open or short in the shift solenoid valve S2 circuit. 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. When the shift solenoid valve S2 is on, if resistance is 8 W or less, the ECM determines there is
a short in the shift solenoid valve S2 circuit.
When the shift solenoid valve S2 is off, if resistance is 100 kW or more, the ECM determines there is an open
in the shift solenoid valve S2 circuit (See page DI±567).
MONITOR STRATEGY
RltdDTCP0976Shift solenoid valve S2/Range check (Low resistance)Related DTCsP0977Shift solenoid valve S2/Range check (High resistance)
Required sensors/ComponentsShift solenoid valve S2
Frequency of operationContinuous
Duration0.064 sec.
MIL operationImmediate
Sequence of operationNone
DIDJJ±01

± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±651
845 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P0985 Shift Solenoid ºEº Control Circuit Low
(Shift Solenoid Valve SR)
DTC P0986 Shift Solenoid ºEº Control Circuit High
(Shift Solenoid Valve SR)
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
P0985ECM detects short in solenoid valve SR circuit 2 times when
solenoid valve SR is operated (1±trip detection logic)
Short in shift solenoid valve SR circuit

Shift solenoid valve SR

ECM
P0986ECM detects open in solenoid valve SR circuit 2 times when
solenoid valve SR is not operated (1±trip detection logic)
Open in shift solenoid valve SR circuit

Shift solenoid valve SR

ECM
MONITOR DESCRIPTION
These DTCs indicate an open or short in the shift solenoid valve SR circuit. 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. When the shift solenoid valve SR is on, if resistance is 8 W or less, the ECM determines there is
a short in the shift solenoid valve SR circuit.
When the shift solenoid valve SR is off, if resistance is 100 kW or more, the ECM determines there is an open
in the shift solenoid valve SR circuit (See page DI±567).
MONITOR STRATEGY
RltdDTCP0985Shift solenoid valve SR/Range check (Low resistance)Related DTCsP0986Shift solenoid valve SR/Range check (High resistance)
Required sensors/ComponentsShift solenoid valve SR
Frequency of operationContinuous
Duration0.064 sec.
MIL operationImmediate
Sequence of operationNone
DIDJK±01