TOYOTA SEQUOIA 2001 Service Repair Manual

± 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.

DIDIV±01
A21570A22717
± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±545
739 Author: Date:
2005 SEQUOIA (RM1146U)
LIST OF DISABLE A MONITOR
HINT:
This table indicates ECM monitoring status for the items in the upper columns if the DTCs in each line on
the left are being set.
As for the ºXº mark, when the DTC on the left is stored, detection of the DTC in the upper column is not per-
formed.

A21571
DI±546
± DIAGNOSTICSAUTOMATIC TRANSMISSION
740 Author: Date:
2005 SEQUOIA (RM1146U)

A21572A22718A22768
± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±547
741 Author: Date:
2005 SEQUOIA (RM1146U)

A21573
DI±548
± DIAGNOSTICSAUTOMATIC TRANSMISSION
742 Author: Date:
2005 SEQUOIA (RM1146U)