Page 881 of 4323
± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±679
873 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check torque converter clutch (See page AT±30).
OK:
The torque converter clutch operates normally.
NG Replace the torque converter clutch
(See page AT±25).
OK
Repair or replace transmission (See page
AT±25).
Page 882 of 4323

Current flow to solenoid
Lock±up
Operation
Pressure
BE4056D00160
1 cycle ON
OFF DI±680
± DIAGNOSTICSAUTOMATIC TRANSMISSION
874 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P2759Torque Converter Clutch Pressure Control Solenoid
Control Circuit Electrical(Shift Solenoid Valve SLU)
CIRCUIT DESCRIPTION
The amount of current flow to the solenoid is controlled by the
(*) duty ratio of the ECM output signal. The higher the duty ratio
becomes, the higher the lock±up hydraulic pressure becomes
during the lock±up operation.
(*) Duty Ratio
The duty ratio is the ratio of the period of continuity in one cycle.
For example, if A is the period of continuity in one cycle, and B
is the period of non±continuity, then
Duty Ratio = A/(A + B) x 100 (%)
DTC No.DTC detection conditionTrouble Area
P2759Open or short is detected in shift solenoid valve SLU circuit for
1 second or more while driving (1±trip detection logic).Open or short in shift solenoid valve SLU circuit
Shift solenoid valve SLU
ECM
MONITOR DESCRIPTION
When an open or short in a shift solenoid valve (SLU) circuit is detected, the ECM determines there is a mal-
function. The ECM will turn on the MIL and store this DTC.
MONITOR STRATEGY
Related DTCsP2759Shift solenoid valve SLU/Range check
Required sensors/ComponentsShift solenoid valve SLU
Frequency of operationContinuous
Duration1 sec.
MIL operationImmediate
Sequence of operationNone
DIDJP±01
Page 883 of 4323
D14178
Electronically Controlled
Transmission Solenoid
E7ECM
E7 P±L
L±W15
14SLU+
SLU± 13 LG
BR
SLU± SLU+ E1
+B
5
± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±681
875 Author: Date:
2005 SEQUOIA (RM1146U)
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever this DTC is
not present.See page DI±545
Solenoid current cut statusNot cut
CPU commanded duty19% or more±
Battery voltage11 V or more±
Ignition switchON
StarterOFF
TYPICAL MALFUNCTION THRESHOLDS
Detection criteriaThreshold
Solenoid status from ICFail (Open or short)
COMPONENT OPERATING RANGE
ParameterStandard value
Output signal dutyLess than 100%
WIRING DIAGRAM
Page 884 of 4323
1
152 3 4 5 6 7 8
9 10 11 12
13 14
D11994
Transmission Wire Side:
(Connector Front View):
E1
SLU±
SLU+
DI±682
± DIAGNOSTICSAUTOMATIC TRANSMISSION
876 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Inspect transmission wire.
PREPARATION:
Disconnect the transmission wire connector.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionSpecified Condition
20C (68F)
13 (SLU+) ± 5 (SLU±)5.0 to 5.6 W
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionSpecified Condition
13 (SLU+) ± Body ground10 kW or higher
5 (SLU±) ± Body ground=
NG Go to step 3.
OK
Page 885 of 4323
D14166
ECM:
SLU+
SLU±E8E7E6E5E4
± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±683
877 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 ± 15 (SLU+) ± E7 ± 14 (SLU±)5.0 to 5.6 W
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionSpecified Condition
E7 ± 15 (SLU+) ± Body ground10 kW or higher
E7 ± 14 (SLU±) ± Body ground=
NG Repair or replace the harness or connector
(See page IN±35).
OK
Replace the ECM (See page SF±80).
Page 886 of 4323
D12795
12
(±)(+)
12
Shift Solenoid Valve SLU:
DI±684
± DIAGNOSTICSAUTOMATIC TRANSMISSION
878 Author: Date:
2005 SEQUOIA (RM1146U)
3 Inspect shift solenoid valve SLU.
PREPARATION:
Remove the shift solenoid valve SLU (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 SLU
(See page AT±10).
OK
Repair or replace the transmission wire
(See page AT±7).
Page 887 of 4323

± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±685
879 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P2772 Transfer L4 SW Circuit
CIRCUIT DESCRIPTION
The ECM detects the signal from the transfer L4 position switch.
This DTC indicates that the transfer L4 position switch remains ON.
DTC No.DTC Detecting ConditionTrouble Area
P2772
Transfer L4 position switch remains ON while vehicle running
under conditions for 18 seconds or more (1±trip detection log-
ic)
(a) Output shaft speed 3000 rpm or less
(b) Transfer shift position is HShort in transfer L4 position switch circuit
Transfer L4 position switch
4WD control ECU
ECM
MONITOR DESCRIPTION
The ECM monitors the transfer±case L4 position switch to determine when the transfer±case L4 gear is en-
gaged. If the transfer±case L4 gears remain engaged under the following conditions, the ECM will conclude
that there is a malfunction of the L4 position switch:
L4 switch indicated that the L4 transfer±case gears are engaged.
Transfer±case shifter is in the ºHº position.
Transfer±case output shaft rpm is between 750 and 3,000 rpm.
The specified time period has elapsed.
If all of the above conditions are detected, the ECM will conclude that there is a malfunction of the L4 switch,
and illuminate the MIL and store the DTC.
MONITOR STRATEGY
Related DTCsP2772Transfer L4 position switch/ON malfunction
Required sensors/ComponentsTransfer L4 position switch
Frequency of operationContinuous
DtiON malfunction (A)1.8 sec.DurationON malfunction (B)0.5 sec.
MIL operation1 driving cycle
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
All:
Output speed sensor circuitNot circuit malfunction
Vehicle speed sensor circuitNot circuit malfunction
Transfer neutral position switchOFF
ON malfunction (A)
Output speed (Transfer output speed)1,000 to 3,000 rpm
ON malfunction (B)
Output speed (Transfer output speed)143 rpm or more±
DIDJQ±01
Page 888 of 4323
D14217
ECM
L4 E6
F2324
IG410
L±R* L±R* 4WD Control ECU
*: 4WD L413 DI±686
± DIAGNOSTICSAUTOMATIC TRANSMISSION
880 Author: Date:
2005 SEQUOIA (RM1146U)
TYPICAL MALFUNCTION THRESHOLDS
Detection criteriaThreshold
Both of the following conditions is met: ON malfunctions (A) and (B)
ON malfunction (A)
L4 switchON
ON malfunction (B)
Actual Transfer gear ratio
Transfer input speed/Transfer output speed0.9 to 1.1
WIRING DIAGRAM