2001 TOYOTA SEQUOIA TS pin

D14137
Refill Plug
Overflow Plug
D14138
DI±528
± DIAGNOSTICSAUTOMATIC TRANSMISSION
722 Author: Date:
2005 SEQUOIA (RM1146U)
(a) When adding maximum amount of fluid: [*1]
(1) Lift up the vehicle while keeping it level.
(2) Remove the refill plug and overflow plug.
(3) Add ATF through the refill hole until it drains out from
the overflow hole.
NOTICE:
Be sure to add Toyota genuine ATF WS.

DIDIR±01
DI±538
± DIAGNOSTICSAUTOMATIC TRANSMISSION
732 Author: Date:
2005 SEQUOIA (RM1146U)
MECHANICAL SYSTEM TESTS
1. PERFORM MECHANICAL SYSTEM TESTS
(a) Measure the stall speed.
The object of this test is to check the overall performance of the transmission and engine by measuring
the stall speeds in the D positions.
NOTICE:

Perform the test at the normal operating ATF (Automatic Transmission Fluid) temperature 50
to 80°C (122 to 176°F).

Do not continuously run this test for longer than 5 seconds.

To ensure safety, do this test in a wide, clear level area which provides good traction.

The stall test should always be carried out in pairs. One technician should observe the condi-
tions of wheels or wheel stoppers outside the vehicle while the other is doing the test.
(1) Chock all 4 wheels.
(2) Connect a hand±held tester to DLC3.
(3) Fully apply the parking brake.
(4) Using your left foot, keep the brake pedal firmly depressed.
(5) Start the engine.
(6) Shift into the D position. Press all the way down on the accelerator pedal with your right foot.
(7) Quickly read the stall speed at this time.
Stall speed: 2,200 ± 150 rpm
Evaluation:
ProblemPossible cause
(a) Stall engine speed is low in D position

Engine power output may be insufficient

Stator one±way clutch is not operating properly
HINT: If the value is less than the specified value by 600 rpm or
more, the torque converter could be faulty.
(b) Stall engine speed is high in D position

Line pressure is too low

Clutch No.1 (C
1) slipping

One±way clutch No.3 (F
3) is not operating properly

Improper fluid level

DI±554
± DIAGNOSTICSAUTOMATIC TRANSMISSION
748 Author: Date:
2005 SEQUOIA (RM1146U) Shift point too high or too low
1. Shift solenoid valve (SLT) circuit *1
2. Speed sensor NT circuit *1
3. Speed sensor SP2 circuit *1
4. Throttle position sensor circuit *1
5. ATF temperature sensor circuit *1
6. ECM
DI±662
DI±591
DI±596
DI±58
DI±582
IN±35
Up±shift to 5th from 4th while shift lever is in 4 position1. O/D main switch circuit
2. ECMDI±688
IN±35
Up±shift to 5th from 4th while engine is cold1. Engine coolant temp. sensor circuit *1
2. ECM
DI±58
IN±35
Up±shift to 4th from 3rd while shift lever is in 3 position1. Park/neutral position switch circuit *1
2. ECM
DI±576
IN±35
Up±shift to 3rd from 2nd while shift lever is in 2 position1. Park/neutral position switch circuit *1
2. ECM
DI±576
IN±35
Up±shift to 2nd from 1st while shift lever is in L position1. Shift position L switch circuit
2. ECMDI±691
IN±35
Harsh engagement (N " D)
1. Speed sensor NT circuit *1
2. Shift solenoid valve (SL1) circuit *1
3. Shift solenoid valve (SLT) circuit *1
4. ECM
DI±591
DI±603
DI±662
IN±35
Harsh engagement (Lock±up)
1. Speed sensor NT circuit *1
2. Speed sensor SP2 circuit *1
3. Shift solenoid valve (SLU) circuit *1
4. ECM
DI±591
DI±596
DI±680
IN±35
Harsh engagement (Any driving position)ECMIN±35
Poor acceleration
1. ATF temperature sensor No.2 circuit *1
2. Engine coolant temp. sensor circuit *1
3. Shift solenoid valve (SLT) circuit *1
4. ECM
DI±666
DI±58
DI±662
IN±35
No engine brakingECMIN±35
No kick±downECMIN±35
Engine stalls when starting off or stopping1. Shift solenoid valve (SLU) circuit *1
2. ECM
DI±680
IN±35
AT Oil Temp. warning light remains on1. ATF temperature sensor No.2 circuit*1DI±666
Lock±up at 3rd gear
1. AT F temperature sensor No.2 circuit 1
2. Engine coolant temp. sensor circuit *1DI±666
DI±58
Shift point too high
2. Engine coolant tem . sensor circuit
3. ECMDI 58
IN±35
Malfunction in shifting1. Park/neutral position switch circuit *1
2. ECM
DI±576
IN±35

DI±556
± DIAGNOSTICSAUTOMATIC TRANSMISSION
750 Author: Date:
2005 SEQUOIA (RM1146U) Harsh engagement (4th " 5th)
1. Shift solenoid valve (SL1)
2. Shift solenoid valve (SL2)
3. Valve body assy
4. Off±vehicle repair matrix chartDI±620
DI±625
AT±10
±
Harsh engagement (5th " 4th)
1. Shift solenoid valve (SL1)
2. Shift solenoid valve (SL2)
3. Valve body assy
4. Off±vehicle repair matrix chartDI±620
DI±625
AT±10
±
Slip or shudder (Forward and reverse)
1. Transmission control cable
2. Valve body assy
3. Oil strainer
4. Off±vehicle repair matrix chartDI±524
AT±10
AT±10
±
No engine braking (1st: L position)1. Valve body assy
2. Off±vehicle repair matrix chartAT±10
±
No engine braking (2nd: 2 position)1. Valve body assy
2. Off±vehicle repair matrix chartAT±10
±
No kick±downValve body assyAT±10
Shift point too high or too low
1. Shift solenoid valve (SLT)
2. Shift solenoid valve (SL1)
3. Valve body assyDI±656
DI±620
AT±10
Poor acceleration1. Shift solenoid valve (SLT)
2. Valve body assyDI±656
AT±10
Engine stalls when starting off or stopping1. Shift solenoid valve (SLU)
2. Valve body assyDI±672
AT±10

DI±558
± DIAGNOSTICSAUTOMATIC TRANSMISSION
752 Author: Date:
2005 SEQUOIA (RM1146U) No engine braking (1st: L position)
Brake No. 4 (B4)

No engine braking (2nd: 2 position)Brake No. 2 (B2)

No engine braking (3rd: 3 position)Brake No. 1 (B1)

Poor acceleration (All positions)Torque converter clutchAT±30
Poor acceleration (5th)
1. Clutch No. 1 (C1)
2. Clutch No. 3 (C
3)
3. Brake No. 1 (B
1)
4. Front planetary gear unit








Engine stalls when starting off or stoppingTorque converter clutchAT±30

I21525
Free Pushed in
D14167
ECM:
E8E7E6E5E4
STP(+)
DI±602
± DIAGNOSTICSAUTOMATIC TRANSMISSION
796 Author: Date:
2005 SEQUOIA (RM1146U)
2 Inspect stop light switch.
PREPARATION:
Remove the stop lamp switch assy.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Switch positionTester ConnectionSpecified Condition
Switch pin free1 ± 4Below 1 W
Switch pin pushed in=10 kW or higher
Switch pin free2 ± 310 kW or higher
Switch pin pushed in=Below 1 W
NG Replace stop light switch (See page BR±8).
OK
3 Check harness and connector (ECM ± stop light switch).
PREPARATION:
Install the stop lamp switch assy.
CHECK:
Measure the voltage according to the value(s) in the table be-
low when the brake pedal is depressed and released.
OK:
ConditionTester ConnectionSpecified Condition
Brake pedal is depressedE4 ± 15 (STP) ±
Body ground10 to 14 V
Brake pedal is released=Below 1 V
NG Repair or replace the harness or connector
(See page IN±35).
OK
Replace the ECM (See page SF±80).

I21525
Free Pushed in
F16805
Wire Harness View:
S25
STP
± DIAGNOSTICSAIR SUSPENSION SYSTEM
DI±769
963 Author: Date:
2005 SEQUOIA (RM1146U)
3 Inspect stop light switch assy.
PREPARATION:
Disconnect the stop light switch assy connector.
CHECK:
Check resistance between terminals 1 and 4 of the stop light
switch assy.
OK:
Switch conditionTester connectionSpecified condition
Switch pin free1 ± 4Below 1 W
Switch pin pushed in1 ± 410 kW or higher
NG Replace stop light switch assy.
OK
4 Inspect suspension control ECU.
PREPARATION:
Disconnect the ECU connector.
CHECK:
Measure the voltage between terminal S25±27 (STP) of the
suspension control ECU and body ground when the stop lamp
switch is ON and OFF.
OK:
Switch conditionSpecified condition
Brake pedal depressed (ON)10 to 14 V
Brake pedal released (OFF)Below 1 V
NG Repair or replace harness connector.
OK
Replace suspension control ECU
(See page IN±35).

DIDLX±01
DI±894
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1088 Author: Date:
2005 SEQUOIA (RM1146U)
SYSTEM DESCRIPTION
1. SYSTEM DESCRIPTION
HINT:

The yaw rate sensor and deceleration sensor are combined and in a single unit. This unit communi-
cates with the skid control ECU through the CAN communication system.

No changes have been made to the communication method between the VSC system and ECM. How-
ever, the communication method between the Translate ECU and ECM has been changed from serial
to CAN communication.
(a) ABS
(Anti±lock Brake System)
The ABS helps prevent the wheels from locking when the brakes are applied firmly or when braking
on a slippery surface.
(b) EBD
(Electronic Brake force Distribution)
The EBD control utilizes ABS, realizing proper brake force distribution between front and rear wheels
in accordance with driving conditions.
In addition, during braking while cornering, it also controls the brake forces of the right and left wheels,
helping to maintain vehicle behavior.
(c) BA (Brake Assist)
The primary purpose of the brake assist system is to provide an auxiliary brake force to assist the driver
who cannot generate a large enough brake force during emergency braking, thus helping to maximize
the vehicle's braking performance.
(d) TRAC
(Traction Control)
The TRAC system helps prevent the drive wheels from slipping if the driver presses down on the accel-
erator pedal excessively when starting off or accelerating on a slippery surface.
(e) VSC
(Vehicle Stability Control)
The VSC system helps prevent the vehicle from slipping sideways as a result of strong front wheel skid
or strong rear wheel skid during cornering.
2. ABS with EBD & BA & TRAC & VSC OPERATION
(a) The skid control ECU calculates vehicle stability tendency based on signals from the speed sensor,
yaw rate (deceleration) sensor and steering angle sensor. In addition, it evaluates the results of the
calculations to determine whether any control actions (control of the engine output torque by electronic
throttle control and of the wheel brake pressure by the brake actuator) should be implemented.
(b) The SLIP indicator blinks and the VSC buzzer sounds to inform the driver that the VSC system is oper-
ating. The SLIP indicator also blinks when TRAC is operating, and the operation being performed is
displayed.
3. FAIL SAFE FUNCTION
(a) When a failure occurs in the ABS & BA & TRAC & VSC systems, the ABS and VSC warning lights come
on and ABS & BA & TRAC & VSC operations are prohibited. In addition to this, when there is a failure
that disables EBD operation, the brake warning light also comes on and EBD operation is prohibited.
(b) If some control is prohibited due to a malfunction during its operation, that control will be cut off gradual-
ly not to change the stability of the vehicle suddenly.