TOYOTA SEQUOIA 2001 Service Repair Manual

± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±669
863 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
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.
ItemMeasurement Item/
Range (display)Normal Condition
AT FLUID TEMP 2
ATF Temp. Sensor Value/
min.: ±40C (±40F)
max.: 215C (419F)
After Stall Test;
Approx. 80C (176F)

Equal to ambient temperature when cold soak
HINT:
When DTC P2742 is output and hand±held tester output is 150C (302F) or more, there is a short circuit.
When DTC P2743 is output and hand±held tester output is ±40C (±40F), there is an open circuit.
Measure the resistance between terminal THO2 (OT2) and body ground.
Temperature DisplayedMalfunction
±40°C (±40°F)Open circuit
150°C (302°F) or moreShort circuit

1
152 3 4 5 6 7 8
9 10 11 12
13 14
D11994OT2+OT2±
Transmission Wire Side:
(Connector Front View):
E1
DI±670
± DIAGNOSTICSAUTOMATIC TRANSMISSION
864 Author: Date:
2005 SEQUOIA (RM1146U)
1 Inspect transmission wire (ATF temperature sensor No.2)
PREPARATION:
Disconnect the transmission wire connector from the transmis-
sion.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionSpecified Condition
1 (OT2±) ± 9 (OT2+)25 W to 156 kW
1 (OT2±) ± Body ground10 kW or higher
9 (OT2+) ± Body ground10 kW or higher
HINT:
If the resistance is out of the specified range with either the ATF
temperature shown in the table below, the driveability of the ve-
hicle may decrease.
ATF TemperatureSpecified Condition
20°C (68°F)3 to 4 kW
110°C (230°F)0.22 to 0.28 kW
NG Repair or replace the transmission wire
(ATF temperature sensor No.2)
(See page AT±7).
OK

D14161
E8E7E6E5E4ECM:
THO2
E2
± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±671
865 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check harness and connector (Transmission wire ± ECM)
PREPARATION:
(a) Connect the transmission wire connector.
(b) Disconnect the connector of the ECM.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionSpecified Condition
E7 ± 32 (THO2) ± E8 ± 28 (E2)25 W to 156 kW
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionSpecified Condition
E7 ± 32 (THO2) ± Body ground10 kW or higher
E8 ± 28 (E2) ± Body ground=
NG Repair or replace the harness or connector
(See page IN±35).
OK
Replace the ECM (See page SF±80).

D14175
G23415D14176
Lock±up
Operation
Pressure
Current Flow to Solenoid DI±672
± DIAGNOSTICSAUTOMATIC TRANSMISSION
866 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P2757Torque Converter Clutch Pressure Control Solenoid
Performance(Shift Solenoid Valve SLU)
SYSTEM DESCRIPTION
The ECM uses the signals from the throttle position sensor, Air±
flow meter, turbine (input) speed sensor, output speed sensor
and crankshaft position sensor to monitor the engagement
condition of the lock±up clutch.
Then the ECM compares the engagement condition of the
lock±up clutch with the lock±up schedule in the ECM memory
to detect a mechanical problems of the shift solenoid valve
SLU, valve body and torque converter clutch.
DTC No.DTC Detection ConditionTrouble Area
P2757
Lock±up does not occur when driving in the lock±up range
(normal driving at 80 km/h [50 mph]), or lock±up remains ON
in the lock±up OFF range.
(2±trip detection logic)
Shift solenoid valve SLU remains open or closed

Valve body is blocked

Torque converter clutch

Automatic transmission (clutch, brake or gear, etc.)

Line pressure is too low
DIDJO±01

± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±673
867 Author: Date:
2005 SEQUOIA (RM1146U)
MONITOR DESCRIPTION
Torque converter lock±up is controlled by the ECM based on the turbine (input) speed sensor NT, output
speed sensor SP2, engine rpm, engine load, engine temperature, vehicle speed, transmission temperature,
and gear selection. The ECM determines the lock±up status of the torque converter by comparing the engine
rpm (NE) to the input turbine rpm (NT). The ECM calculates the actual transmission gear by comparing input
turbine rpm (NT) to output shaft rpm (SP2). When conditions are appropriate, the ECM requests ºlock±upº
by applying control voltage to the shift solenoid SLU. When the SLU is turned on, it applies pressure to the
lock±up relay valve and locks the torque converter clutch.
If the ECM detects no lock±up after lock±up has been requested or if it detects lock±up when it is not re-
quested, the ECM interprets this as a fault in the shift solenoid valve SLU or lock±up system performance.
The ECM will turn on the MIL and store the DTC.
Example:
When any of the following is met, the system judges it as a malfunction.
(a) There is a difference in rotation between the input side (engine speed) and output side (input turbine
speed) of the torque converter when the ECM commands lock±up.
(Engine speed is at least 70 rpm greater than input turbine speed.)
(b) There is no difference in rotation between the input side (engine speed) and output side (input turbine
speed) of the torque converter when the ECM commands lock±up off.
(The difference between engine speed and input turbine speed is less than 35 rpm.)
MONITOR STRATEGY
RltdDTCP2757Shift solenoid valve SLU/OFF malfunctionRelated DTCsP2757Shift solenoid valve SLU/ON malfunction
MainShift solenoid valve SLU
Required sensors/ComponentsSubValve body, Vehicle speed sensor, Throttle position sensor, Speed sensor
(NT), Speed sensor (NO)
Frequency of operationContinuous
OFF malfunction (A)2 sec.
DurationOFF malfunction (B)0.4 sec.Duration
ON malfunction1.8 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
Torque converter clutch pressure control
solenoid circuitNot circuit malfunction
KCS sensor circuitNot circuit malfunction
ETCS (Electric throttle control system)Not system down
Transmission rangeºDº

DI±674
± DIAGNOSTICSAUTOMATIC TRANSMISSION
868 Author: Date:
2005 SEQUOIA (RM1146U) ECT (Engine coolant temperature)
40°C (104°F) or more±
Spark advance from Max. retard timing by
KCS control0° CA or more±
EngineStarting
ECM selected gear4th or 5th
Vehicle speed25 km/h (15.5 mph) or more±
Shift solenoid valve S1 circuitNot on malfunction
Shift solenoid valve S2 circuitNot on malfunction
Shift solenoid valve SL2 circuitNot on malfunction
1±2 Shift valveNot on malfunction
Transfer neutral position switchOFF
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 lock±up commandON
(SLU pressure: 513kpa or more)
Vehicle speed±Less than 100 km/h (62.2 mph)
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)±
ON malfunction
ECM lock±up commandOFF
(SLU pressure: less than 4kpa)
Throttle valve opening angle9% or more±
Vehicle speed±Less than 60 km/h (37.3 mph)

± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±675
869 Author: Date:
2005 SEQUOIA (RM1146U)
TYPICAL MALFUNCTION THRESHOLDS
Detection criteriaThreshold
Both of the following conditions are met: OFF malfunctions (A) and (B)
OFF malfunction (A)
Engine speed ± Turbine speed70 rpm or more
OFF malfunction (B)
Turbine speed/Output speedNot
3.30 to 7.50
ON malfunction
2 detections are necessary per driving cycle
1st detection; temporary flag ON
2nd detection; pending fault code ON
Vehicle speed must be under 10 km/h (6.2 mph) once before 2nd detection
Difference between engine speed and turbine speedLess then 35 rpm

G23400G23400D14177
Accelerator Pedal
Opening Angle
Lock±up OFF
Lock±up ON
"time Engine Speed
Accelerator Pedal
Fully Released DI±676
± DIAGNOSTICSAUTOMATIC TRANSMISSION
870 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.
ItemTest DetailsDiagnostic Note
LOCK UP
[Test Details]
Control the shift solenoid SLU to set the automatic transmission to the
lock±up condition.
[Vehicle Condition]

Throttle valve opening angle: Less than 35 %

Vehicle Speed: 60 km/h (37 mph) or more
Possible to check the SLU opera-
tion.
HINT:

This test can be conducted when the vehicle speed is 60 km/h (37 mph) or more.

This test can be conducted in the 5th gear.

Lightly depress the accelerator pedal and check that the engine speed does not change abruptly.
HINT:

When changing the accelerator pedal opening angle while driving, if the engine speed does not
change, lock±up is on.

Slowly release, but not fully, the accelerator pedal in order to decelerate. (Fully releasing the pedal will
close the throttle valve and lock±up may be turned off automatically.)

± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±677
871 Author: Date:
2005 SEQUOIA (RM1146U)
1 Check other DTCs output (in addition to DTC P2757).
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 ºP2757º is outputA
ºP2757º and other DTCsB
HINT:
If any other codes besides ºP2757º are output, perform troubleshooting for those DTCs first.
B Go to DTC chart (See page DI±573).
A

D12795
12
(±)(+)
12
Shift Solenoid Valve SLU:
DI±678
± DIAGNOSTICSAUTOMATIC TRANSMISSION
872 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check shift solenoid valve SLU operation.
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
3 Inspect valve body (See page AT±10).
OK:
There are no foreign objects on each valve.
NG Repair or replace valve body.
OK