Lexus ES300 (2002 year). Manual — part 336

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DIAGNOSTICS

ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]

05-395

548

2002 LEXUS ES300 REPAIR MANUAL (RM911U) Corrected - 8/05/02 - MH

(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 and fully depress the accelerator pedal and check for slipping.

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 to see that the parking lock pawl holds the vehicle in place.

(h)

Up-grade/down-grade control function test:
(1)

Check that up-shifting to the 4th or higher gear cannot be made on up-grades.

(2)

When brake is applied on down-grades, check that the gear is automatically down-shifted from
the 5th to 4th, or from the 4th to 3rd gears.

8.

MECHANICAL SYSTEM TESTS

(a)

Measure the stall speed.
The object of this test is to check the overall performance of the transaxle and engine by measuring
the stall speeds in the D and R positions.

NOTICE:

Do the test at the normal operating fluid temperature of 50 - 80

°

C (122 - 176

°

F).

Do not continuously run this test longer than 5 seconds.

To ensure safety, conduct this test in a wide, clear and level area which provide 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 the 4 wheels.

(2)

Fully apply the parking brake.

(3)

Keep your left foot pressed firmly on the brake pedal.

(4)

Start the engine.

(5)

Shift into the D position. Press all the way down on the accelerator pedal with your right foot.
Quickly read the stall speed at this time.

Stall speed: 2,600

150 rpm

Evaluation:

Problem

Possible cause

(a) Stall speed low in D and R positions

Engine output may be insufficient

Stator one-way clutch is not operating properly

HINT:
If more than 600 rpm or below the specified value, the torque
converter could be faulty.

(b) Stall speed high in D position

Line pressure too low

Forward clutch slipping

U/D brake slipping

U/D one-way clutch not operating properly

No. 1 one-way clutch not operating properly

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DIAGNOSTICS

ELECTRONIC CONTROLLED AUTOMATIC
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549

2002 LEXUS ES300 REPAIR MANUAL (RM911U)

(c) Stall speed high in R position

Line pressure too low

Reverse clutch slipping

1st and reverse brake slipping

U/D brake slipping

(d) Stall speed high in D and R positions

Line pressure too low

Improper fluid level

(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 conditions of the U/D direct clutch, forward clutch,
and 1st and reverse brake.

NOTICE:

Do the test at the normal operating fluid temperature of 50 - 80

°

C (122 - 176

°

F).

Be sure to allow 1 minute interval between the tests.

Take 3 measurements and take the average value.
(1)

Fully apply the parking brake.

(2)

Start the engine and check idle speed.

Idle speed: 700

±

50 rpm (In N position and A/C OFF)

(3)

Shift the shift 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.
Measure the time lag of N

→

R in the same way.

Time lag:
N

→

D Less than 1.2 seconds

N

→

R Less than 1.5 seconds

Evaluation (If N

→

D time or N

→

R time lag is longer than specified):

Problem

Possible cause

N

→

D time lag is longer

Line pressure too low

Forward clutch worn

No. 1 one-way clutch not operating properly

U/D one-way clutch not operating

U/D brake worn

N

→

R time lag is longer

Line pressure too low

Reverse clutch worn

1st and reverse brake worn

U/D brake worn

9.

HYDRAULIC TEST

(a)

Measure the line pressure.

NOTICE:

Do the test at the normal operation fluid temperature
the 50 - 80

°

C (122 - 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 doing the test.

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

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

Do under condition that A/C is OFF.

When being stalled, do not continue more than 10 se-
conds.

C99444

Test Plug A:
D Position (CO)

Test Plug B:
R Position (C2)

SST

SST

Transmission Wire

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DIAGNOSTICS

ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]

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2002 LEXUS ES300 REPAIR MANUAL (RM911U) Corrected - 8/05/02 - MH

(1)

Warm up the ATF.

(2)

Lift the vehicle up.

(3)

Remove 4 screws and 4 clips, and remove the en-
gine under cover No.1.

(4)

Remove 2 bolts and 2 clips, and remove the front
fender apron seal LH.

(5)

Remove 7 clips and remove radiator lower air de-
flector.

(6)

Remove 2 bolts off and remove the air cleaner inlet
No.1.

(7)

Remove a bolt off and remove the air cleaner inlet
No.1.

HINT:
Remove air cleaner, take 3 bolts off to raise the air cleaner case,
and remove the air cleaner inlet No.1.
NOTICE:
Do not apply excessive force to the resonator.

(8)

Connect OBD II scan tool or hand-held tester to
DLC3.

(9)

Remove the test plug A, install the SST and start en-
gine.

SST

09992-00095 (09992- 00231, 09992-00271)

NOTICE:
There is a difference in installation point between D posi-
tion and R position.

(10) Using OBD II scan tool or hand-held tester, shift to

D position and hold 3rd by active test, and measure
the line pressure in idling.

Specified line pressure:

Condition

D position kPa (kgf/cm

2

,

psi)

Idling

373 - 402 (3.8 - 4.1, 54 - 58)

(11) Turn the ignition switch OFF.
(12) Disconnect 2 connectors of transmission wire.

HINT:
Disconnect the 2 connectors only when performing the D posi-
tion stall test.

(13) Start engine.
(14) Depress the brake pedal strongly, shift to D posi-

tion, depress the accelerator pedal all the way down
and check the line pressure in being stalled.

Specified line pressure:

Condition

D position kPa (kgf/cm

2

,

psi)

Stall

931 - 1,030 (9.5 - 10.5, 135 - 149)

(15) Turn the ignition switch OFF.
(16) Remove the SST, install the test plug A.
(17) Remove the test plug B, install the SST and start en-

gine.

SST

09992-00095 (09992- 00231, 09992-00271)

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DIAGNOSTICS

ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]

551

2002 LEXUS ES300 REPAIR MANUAL (RM911U)

(18) Connect 2 connectors of transmission wire, de-

press the brake pedal strongly, shift to R position
and check the line pressure in idling and being
stalled.

Specified line pressure:

Condition

R position kPa (kgf/cm

2

,

psi)

Idling

677 - 735 (6.9 - 7.5, 98 - 107)

Stall

1,775 - 1,961 (18.1 - 20.0, 257 - 284)

(19) Remove the SST, install the test plug B.
(20) Clear the DTC.

Evaluation:

Problem

Possible cause

If the measured values at all position are higher

Line pressure control solenoid (SLT) defective

Regulator valve defective

If the measured values at all position are lower

Line pressure control solenoid (SLT) defective

Regulator valve defective

Oil pump defective

U/D direct clutch defective

If pressure is low in the D position only

D position circuit fluid leak

Forward clutch defective

If pressure is low in the R position only

R position circuit fluid leak

Reverse clutch defective

1st and reverse brake defective