automatic transmission TOYOTA SEQUOIA 2001 Service Service Manual

DIDIQ±01
± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±535
729 Author: Date:
2005 SEQUOIA (RM1146U)
ROAD TEST
1. PROBLEM SYMPTOM CONFIRMATION
Based on the result of the customer problem analysis, try to reproduce the symptoms. If the problem is that
the transaxle does not shift up, shift down, or the shift point is too high or too low, conduct the following road
test referring to the automatic shift schedule and simulate the problem symptoms.
2. ROAD TEST
NOTICE:
Perform the test at the normal operating ATF (Automatic Transmission Fluid) temperature: 50 to 80°C
(122 to 176°F).
(a) D position test:
Shift into the D position and fully depress the accelerator pedal and check the following points. Check
up±shift operation.
(1) Check up±shift operation.
Check that 1 " 2, 2 " 3, 3 " 4 and 4 " 5th up±shifts take place, and that the shift points conform
to the automatic shift schedule (See page SS±24).
HINT:
5th Gear Up±shift Prohibition Control

Engine coolant temperature is 55 °C (131 °F) or less and vehicle speed is at 51 km/h (32 mph) or less.
4th Gear Up±shift Prohibition Control

Engine coolant temperature is 40 °C (104 °F) or less and vehicle speed is at 45 km/h (28 mph) or less.
5th Gear Lock±up Prohibition Control

Brake pedal is depressed.

Accelerator pedal is released.

Engine coolant temperature is 60 °C (140 °F) or less.
(2) Check for shift shock and slip.
Check for shock and slip at the 1 " 2, 2 " 3, 3 " 4 and 4 " 5th up±shifts.
(3) Check for abnormal noise and vibration.
Check for abnormal noise and vibration when up±shifting from 1 " 2, 2 " 3, 3 " 4 and 4 " 5
while driving with the shift lever in the D position, and check while driving in the lock±up condition.
HINT:
The check for the cause of abnormal noise and vibration must be done thoroughly as it could also be due
to loss of balance in the differential, torque converter clutch, etc.
(4) Check kick±down operation.
Check vehicle speeds when the 2nd to 1st, 3rd to 2nd, 4th to 3rd, and 5th to 4th kick±downs take
place while driving with the shift lever in the D position. Confirm that each speed is within the
applicable vehicle speed range indicated in the automatic shift schedule (See page SS±24).
(5) Check abnormal shock and slip at kick±down.
(6) Check the lock±up mechanism.

Drive in the D position (5th gear), at a steady speed (lock±up ON).

Lightly depress the accelerator pedal and check that the engine speed does not change
abruptly.
HINT:
If there is a big jump in engine speed, there is no lock±up.

DI±536
± DIAGNOSTICSAUTOMATIC TRANSMISSION
730 Author: Date:
2005 SEQUOIA (RM1146U)
(b) 4 (O/D OFF) position test:
Shift into the 4 (O/D OFF) position and fully depress the accelerator pedal and check the following
points.
(1) Check up±shift operation.
Check that the 1 " 2, 2 " 3 and 3 " 4 up±shifts take place and that the shift point conforms
to the automatic shift schedule (See page SS±24).
HINT:

There is no 5th up±shift in the 4 position.

4th Gear Lock±up Prohibition Control

Brake pedal is depressed.

Accelerator pedal is released.

Engine coolant temperature is 60 °C (140 °F) or less.
(2) Check engine braking.
While driving in the 4 position and 4th gear, release the accelerator pedal and check the engine
braking effect.
(3) Check for abnormal noises during acceleration and deceleration, and for shock at up±shift and
down±shift.
(4) Check the lock±up mechanism.

Drive in 4 position 4th gear, at a steady speed (lock±up ON).

Lightly depress the accelerator pedal and check that the engine speed does not change
abruptly.
HINT:
If there is a big jump in engine speed, there is no lock±up.
(c) 3 position test:
Shift into the 3 position and fully depress the accelerator pedal and check the following points.
(1) Check up±shift operation.
Check that the 1 " 2 and 2 " 3 up±shifts takes place and that the shift point conforms to the
automatic shift schedule (See page SS±24).
HINT:

There is no 4th up±shift and lock±up in the 3 position.

When the 2nd start switch is ON, there is no 1 "2 up±shift and 2 "1 down±shift.
(2) Check engine braking.
While running in the 3 position and 3rd gear, release the accelerator pedal and check the engine
braking effect.
(3) Check for abnormal noises during acceleration and deceleration, and for shock at up±shift and
down±shift.
(d) 2 position test:
Shift into the 2 position and fully depress the accelerator pedal and check the following points.
(1) Check up±shift operation.
Check that the 1 " 2 up±shift takes place and that the shift point conforms to the automatic shift
schedule (See page SS±24).
HINT:

There is no 3rd up±shift and lock±up in the 2 position.

When the 2nd start switch is ON, there is no 1 "2 up±shift and 2 "1 down±shift.

± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±537
731 Author: Date:
2005 SEQUOIA (RM1146U)
(2) Check engine braking.
While running in the 2 position and 2nd gear, release the accelerator pedal and check the engine
braking effect.
(3) Check for abnormal noises during acceleration and deceleration, and for shock at up±shift and
down±shift.
(e) L position test:
Shift into the L position and fully depress the accelerator pedal and check the following points.
(1) Check no up±shift.
While running in the L position, check that there is no up±shift to 2nd gear.
(2) Check engine braking.
While running in the L position, release the accelerator pedal and check the engine braking ef-
fect.
(3) Check for abnormal noises during acceleration and deceleration.
(f) R position test:
Shift into the R position, lightly depress the accelerator pedal, and check that the vehicle moves back-
ward without any abnormal noise or vibration.
CAUTION:
Before conducting this test, ensure that the test area is free from people and obstruction.
(g) P position test:
Stop the vehicle on a grade (more than 5°) and after shifting into the P position, release the parking
brake. Then, check that the parking lock pawl holds the vehicle in place.

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

± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±539
733 Author: Date:
2005 SEQUOIA (RM1146U)
(b) Measure the time lag.
When the shift lever is shifted while the engine is idling, there will be a certain time lapse or lag before
the shock can be felt. This is used for checking the condition of the direct clutch, forward clutch, and
1st and reverse brake.
NOTICE:

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

Be sure to allow for a 1 minute interval between tests.

Perform the test three times, and measure the time lags. Calculate the average value of the three
time lags.
(1) Connect a hand±held tester to DLC3.
(2) Fully apply the parking brake.
(3) Start and warm up the engine and check idle speed.
Idle speed: approx. 700 rpm (In N position and A/C OFF)
(4) Shift the lever from the N to D position. Using a stop watch, measure the time from when the lever
is shifted until the shock is felt.
Time lag:
N " D Less than 1.2 seconds
(5) In the same manner, measure the time lag for N " R.
Time lag:
N " R Less than 1.5 seconds
Evaluation (If N " D time or N " R time lag is longer than the specified):
ProblemPossible cause
N " D time lag is longer than specified

Line pressure is too low

Clutch No.1 (C
1) worn

One±way clutch No.3 (F
3) is not operating properly
N " R time lag is longer than specified

Line pressure is too low

Clutch No.3 (C
3) worn

Brake No.4 (B
4) worn

One±way clutch No.1 (F
1) is not operating properly

DIDIS±01
D14143
SST
SST
DI±540
± DIAGNOSTICSAUTOMATIC TRANSMISSION
734 Author: Date:
2005 SEQUOIA (RM1146U)
HYDRAULIC TEST
1. PERFORM HYDRAULIC TEST
Measure the line pressure.
NOTICE:

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

The line pressure test should always be carried out in
pairs. One technician should observe the conditions
of wheels or wheel stoppers outside the vehicle while
the other is performing the test.

Be careful to prevent SST hose from interfering with
the exhaust pipe.

This check must be conducted after checking and ad-
justing engine.

Perform under condition that A/C is OFF.

When conducting stall test, do not continue more
than 10 seconds.
(1) Warm up the ATF (Automatic Transmission Fluid).
(2) Lift the vehicle up.
(3) Remove the test plug on the transmission case cen-
ter right side and connect SST.
SST 09992±00095 (09992±00231, 09992±00271)
(4) Fully apply the parking brake and chock the 4
wheels.
(5) Start the engine and check idling speed.
(6) Keep your left foot pressing firmly on the brake ped-
al and shift into D position.
(7) Measure the line pressure when the engine is idling.
(8) Depress the accelerator pedal all the way down.
Quickly read the highest line pressure when engine
speed reaches stall speed.
(9) In the same manner, do the test in R position.

± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±541
735 Author: Date:
2005 SEQUOIA (RM1146U)
Specified line pressure:
ConditionD position kPa (kgf / cm2, psi)R position kPa (kgf / cm2, psi)
Idling361 to 421 kPa
(3.7 to 4.3 kgf/cm2, 52 to 61 psi)
495 to 576 kPa
(5.0 to 5.9 kgf/cm2, 72 to 84 psi)
Stall test1,236 to 1,332 kPa
(12.6 to 13.6 kgf/cm2, 179 to 193 psi)
1,229 to 1,349 kPa
(12.5 to 13.8 kgf/cm2, 178 to 196 psi)
Evaluation
ProblemPossible cause
Measured values are higher than specified in all positions
Shift solenoid valve (SLT) defective

Regulator valve defective
Measured values are lower than specified in all positions

Shift solenoid valve (SLT) defective

Regulator valve defective

Oil pump defective
Pressure is low in the D position only
D position circuit fluid leak

Clutch No.1 (C
1) defective
Pressure is low in the R position only

R position circuit fluid leak

Clutch No.3 (C
3) defective

Brake No.4 (B
4) defective

DIDIT±01
D11984
DI±542
± DIAGNOSTICSAUTOMATIC TRANSMISSION
736 Author: Date:
2005 SEQUOIA (RM1146U)
MANUAL SHIFTING TEST
1. MANUAL SHIFTING TEST
HINT:

With this test, it can be determined whether the trouble oc-
curs in the electrical circuit or is a mechanical problem in
the transmission.

If any abnormalities are found in the following test, the
problem is in the transmission itself.
(a) Disconnect the connector of the transmission wire.
(b) Drive with the transmission wire disconnected.
Shifting the shift lever to the L, 2, 3, 4 and D position to
check whether the shifting condition changes the table
below.
Shift PositionShifting Condition
L @2No Shift (Not Change)
2 @3Down Shift @Up Shift
3 @4Down Shift @Up Shift
4 @DNo Shift (Not Change)
HINT:
When driving with the transmission wire disconnected, the gear
position will be as follows:

When the shift lever is in the L or the 2 position, the gear
is held in the 1st position.

When the shift lever is in the 3rd position, the gear is held
in the 3rd position.

When the shift lever is in the 4 or the D position, the gear
is held in the 4th position.

When the shift lever is in the R or the P position, the gear
is also in the R or the P position respectively.
(c) Connect the connector of the transmission wire.
(d) Clear the DTC (See page DI±565).

DIDIU±01
± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±543
737 Author: Date:
2005 SEQUOIA (RM1146U)
INITIALIZATION
1. RESET MEMORY
NOTICE:

Perform the RESET MEMORY (AT initialization) when replacing the automatic transmission
assy or ECM.

The RESET MEMORY can be performed only with the Hand±held tester.
HINT:
The ECM memorizes the condition that the ECT controls the automatic transmission assy and engine assy
according to those characteristics. Therefore, when the automatic transmission assy, engine assy, or ECM
has been replaced, it is necessary to reset the memory so that the ECM can memorize the new information.
Reset procedure is as follows.
(a) Turn the ignition switch off.
(b) Connect the hand±held tester to the DLC3.
(c) Turn the ignition switch to the ON position.
(d) Turn the hand±held tester main switch on.
(e) Select the item ºDIAGNOSIS/ENHANCED OBD IIº.
(f) Perform the reset memory procedure from the ENGINE menu.

D13545
Tester menu flow: DI±544
± DIAGNOSTICSAUTOMATIC TRANSMISSION
738 Author: Date:
2005 SEQUOIA (RM1146U)
NOTICE:
After performing the RESET MEMORY, be sure to perform the ROAD TEST (See page DI±535) de-
scribed earlier.
HINT:
The ECM learns through use of the ROAD TEST.