2001 TOYOTA SEQUOIA Page 18

ECM command gearshift
Shift solenoid valve SL21st 2nd 3rd 4th 5th
OFF ON ON ON ON DI±628
± DIAGNOSTICSAUTOMATIC TRANSMISSION
822 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
HINT:
Performing the ACTIVE TEST using the hand±held tester allows the relay, VSV, actuator and so on to oper-
ate without parts removal. Performing the ACTIVE TEST as the first step of troubleshooting is one method
to shorten labor time.
It is possible to display the DATA LIST during the ACTIVE TEST.
(a) Warm up the engine.
(b) Turn the ignition switch off.
(c) Connect the hand±held tester to the DLC3.
(d) Turn the ignition switch to the ON position.
(e) Turn on the tester.
(f) Select the item ºDIAGNOSIS / ENHANCED OBD II / ACTIVE TESTº.
(g) According to the display on the tester, perform the ºACTIVE TESTº.
HINT:
While driving, the shift position can be forcibly changed with the hand±held tester.
Comparing the shift position commanded by the ACTIVE TEST with the actual shift position enables you
to confirm the problem (See page DI±567).
ItemTest DetailsDiagnostic Note
SHIFT
[Test Details]
Operate the shift solenoid valve and set each shift position by yourself.
[Vehicle Condition]
Less than 50 km/h (31 mph)
[Others]
Press º"º button: Shift up
Press ºuº button: Shift down
Possible to check the operation of
the shift solenoid valves.
HINT:
This test can be conducted when the vehicle speed is 50 km/h (31 mph) or less.
The 4th to 5th up±shiftings must be performed with the accelerator pedal released.
The 5th to 4th down±shiftings must be performed with the accelerator pedal released.
Do not operate the accelerator pedal for at least 2 seconds after shifting and do not shift successively.
The shift position commanded by the ECM is shown in the DATA LIST (SHIFT) display on the hand±
held tester.
The shift solenoid valve SL2 is turned on/off normally when the shift lever is in the D position:

± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±629
823 Author: Date:
2005 SEQUOIA (RM1146U)
1 Check other DTCs output (in addition to DTC P0776).
PREPARATION:
(a) Turn the ignition switch off.
(b) Connect the OBD II scan tool or hand±held tester to the DLC3.
(c) Turn the ignition switch to the ON position.
(d) Turn on the tester.
(e) Select the item ºDIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODESº.
CHECK:
Read the DTCs using the OBD II scan tool or the hand±held tester.
RESULT:
Display (DTC output)Proceed to
Only ºP0776º is outputA
ºP0776º and other DTCsB
HINT:
If any other codes besides ºP0776º are output, perform troubleshooting for those DTCs first.
B Go to DTC chart (See page DI±573).
A

D12795
12
(±)(+)
12
Shift Solenoid Valve SL2:
DI±630
± DIAGNOSTICSAUTOMATIC TRANSMISSION
824 Author: Date:
2005 SEQUOIA (RM1146U)
2 Inspect shift solenoid valve SL2.
PREPARATION:
Remove the shift solenoid valve SL2 (See page AT±10).
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionSpecified Condition
20C (68F)
1 ± 25.0 to 5.6 W
CHECK:
Connect the positive (+) lead with a 21 W bulb to terminal 2 and
the negative (±) lead to terminal 1 of the solenoid valve connec-
tor, then check the movement of the valve.
OK:
The solenoid makes an operating sound.

NG Replace the shift solenoid valve SL2
(See page AT±10).
OK
3 Inspect valve body (See page AT±10).
OK:
There are no foreign objects on each valve.
NG Repair or replace valve body.
OK
Repair or replace transmission (See page
AT±25).

± 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

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) Connect the transmission wire connector.
(b) Disconnect the ECM connector.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionSpecified Condition
20C (68F)
E7 ± 17 (SL2+) ± E7 ± 16 (SL2±)5.0 to 5.6 W
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionSpecified Condition
E7 ± 17 (SL2+) ± Body ground10 kW or higher
E7 ± 16 (SL2±) ± Body ground=
NG Repair or replace the harness or connector
(See page IN±35).
OK
Replace the ECM (See page SF±80).

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 solenoid valve SL2 (See page AT±10).
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionSpecified Condition
20C (68F)
1 ± 25.0 to 5.6 W
CHECK:
Connect the positive (+) lead with a 21 W bulb to terminal 2 and
the negative (±) lead to terminal 1 of the solenoid valve connec-
tor, then check the movement of the valve.
OK:
The solenoid makes an operating sound.

NG Replace the shift solenoid valve SL2
(See page AT±10).
OK
Repair or replace the transmission wire
(See page AT±7).

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 speed
(After transition from 4th to 5th gear)±Less than 100 km/h (62.2 mph)
TYPICAL MALFUNCTION THRESHOLDS
Detection criteriaThreshold
Both of the following conditions are met: Condition (A), and Condition (B), (C) or (D)
Condition (A)
Turbine speed/Output speed3.30 to 7.50
Condition (B)
Turbine speed/Output speed1.28 to 1.53
Condition (C)
Turbine speed ± Output speed x 4th gear ratio
(NT ± NO x 4th gear ratio)1,000 rpm or more
Condition (D)
Turbine speed ± Output speed x 5th gear ratio
(NT ± NO x 5th gear ratio)1,000 rpm or more
INSPECTION PROCEDURE
1 Check other DTCs output (in addition to DTC P0781).
PREPARATION:
(a) Turn the ignition switch off.
(b) Connect the OBD II scan tool or hand±held tester to the DLC3.
(c) Turn the ignition switch to the ON position.
(d) Turn on the tester.
(e) Select the item ºDIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODESº.
CHECK:
Read the DTCs using the OBD II scan tool or the hand±held tester.
RESULT:
Display (DTC output)Proceed to
Only ºP0781º is outputA
ºP0781º and other DTCsB
HINT:
If any other codes besides ºP0781º are output, perform troubleshooting for those DTCs first.
B Go to DTC chart (See page DI±573).
A

± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±639
833 Author: Date:
2005 SEQUOIA (RM1146U)
2 Perform active test
HINT:
Performing the ACTIVE TEST using the hand±held tester allows the relay, VSV, actuator and so on to oper-
ate without parts removal. Performing the ACTIVE TEST as the first step of troubleshooting is one method
to shorten labor time.
It is possible to display the DATA LIST during the ACTIVE TEST.
(a) Warm up the engine.
(b) Turn the ignition switch off.
(c) Connect the hand±held tester to the DLC3.
(d) Turn the ignition switch to the ON position.
(e) Turn on the tester.
(f) Select the item ºDIAGNOSIS / ENHANCED OBD II / ACTIVE TESTº.
(g) According to the display on the tester, perform the ºACTIVE TESTº.
HINT:
While driving, the shift position can be forcibly changed with the hand±held tester.
Comparing the shift position commanded by the ACTIVE TEST with the actual shift position enables you
to confirm the problem (See page DI±567).
Standard:
ItemTest DetailsDiagnostic Note
SHIFT
[Test Details]
Operate the shift solenoid valve and set each shift position by yourself.
[Vehicle Condition]
Less than 50 km/h (31 mph)
[Others]

Press º"º button: Shift up

Press ºuº button: Shift down
Possible to check the operation of
the shift solenoid valves.
HINT:

This test can be conducted when the vehicle speed is 50 km/h (31 mph) or less.

The 4th to 5th up±shiftings must be performed with the accelerator pedal released.

The 5th to 4th down±shiftings must be performed with the accelerator pedal released.

Do not operate the accelerator pedal for at least 2 seconds after shifting and do not shift successively.

The shift position commanded by the ECM is shown in the DATA LIST (SHIFT) display on the hand±
held tester.
OK:
Gear position changes in accordance with the tester command.
NG Repair or replace valve body

(See page AT±10).
OK