2001 TOYOTA SEQUOIA Service Repair Manual

mileage fuel pump wipers child restraint TPMS reset radio controls

Page 833 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual ± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±631
825 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P0778 Pressure Control Solenoid ºBº Electrical
(Shift Solenoid Valve SL2)
CIRCUIT DESCRIPTION
Shifting f

± 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

Page 834 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual D14168
Electronically Controlled
Transmission Solenoid
E7ECM
LG±BGR17
16SL2+
SL2± 11
3 V Y E1
SL2+
SL2±+B
CPU
E7 DI±632
± DIAGNOSTICSAUTOMATIC TRANSMISSION
826 Author: Date:
2005 SEQUOIA (RM

Page 835 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual ECM command gearshift
Shift solenoid valve SL21st 2nd 3rd 4th 5th
ON
OFF ON ON ON
1
152 3 4 5 6 7 8
9 10 11 12
13 14
D11994SL2+
SL2±
Transmission Wire Side:
(Connector Front View):
E1
± DIAGNOSTICSA

Page 836 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual D14166
ECM:
SL2+
SL2±E8E7E6E5E4
DI±634
± DIAGNOSTICSAUTOMATIC TRANSMISSION
828 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check harness and connector (Transmission wire ± ECM)
PREPARATION:
(a) Con

Page 837 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual D12795
12
(±)(+)
12
Shift Solenoid Valve SL2:
± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±635
829 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check shift solenoid valve SL2.
PREPARATION:
Remove the shift

Page 838 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual 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

Page 839 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual ± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±637
831 Author: Date:
2005 SEQUOIA (RM1146U)
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
All:
Turbine speed sensor circuitNot circuit mal

Page 840 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual DI±638
± DIAGNOSTICSAUTOMATIC TRANSMISSION
832 Author: Date:
2005 SEQUOIA (RM1146U) Engine speed ± Turbine speed (NE ± NT)
(After transition from 4th to 5th gear)
±Less than 150 rpm
Vehicle s

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