Toyota Sequoia (2005). Manual - part 186

–

DIAGNOSTICS

AUTOMATIC TRANSMISSION

DI–539

733

(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):

Problem

Possible 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

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DIAGNOSTICS

AUTOMATIC TRANSMISSION

734

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.

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DIAGNOSTICS

AUTOMATIC TRANSMISSION

DI–541

735

Specified line pressure:

Condition

D position          kPa (kgf / cm

2

, psi)

R position          kPa (kgf / cm

2

, psi)

Idling

361 to 421 kPa 

(3.7 to 4.3 kgf/cm

2

, 52 to 61

 

psi)

495 to 576 kPa 

(5.0 to 5.9 kgf/cm

2

, 72 to 84

 

psi)

Stall test

1,236 to 1,332 kPa 

(12.6 to 13.6 kgf/cm

2

, 179 to 193

 

psi)

1,229 to 1,349 kPa 

(12.5 to 13.8 kgf/cm

2

, 178 to 196

 

psi)

Evaluation

Problem

Possible 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

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DIAGNOSTICS

AUTOMATIC TRANSMISSION

736

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 Position

Shifting Condition

L 

⇔

2

No Shift (Not Change)

2 

⇔

3

Down Shift 

⇔

Up Shift

3 

⇔

4

Down Shift 

⇔

Up Shift

4 

⇔

D

No 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

).