Toyota Sequoia (2005). Manual - part 220

–

DIAGNOSTICS

AUTOMATIC TRANSMISSION

DI–675

869

TYPICAL MALFUNCTION THRESHOLDS

Detection criteria

Threshold

Both of the following conditions are met: OFF malfunctions (A) and (B)

OFF malfunction (A)

Engine speed – Turbine speed

70 rpm or more

OFF malfunction (B)

Turbine speed/Output speed

Not

3.30 to 7.50

ON malfunction

2 detections are necessary per driving cycle

 1st detection; temporary flag ON

 2nd detection; pending fault code ON

Vehicle speed must be under 10 km/h (6.2 mph) once before 2nd detection

Difference between engine speed and turbine speed

Less then 35 rpm

G23400

G23400

D14177

Accelerator Pedal 
Opening Angle

Lock–up OFF

Lock–up ON

→

time

Engine Speed

Accelerator Pedal 
Fully Released

DI–676

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DIAGNOSTICS

AUTOMATIC TRANSMISSION

870

INSPECTION PROCEDURE

HINT:
Performing the ACTIVE TEST using the hand–held tester allows the relay, VSV, actuator and so on to oper-
ate without parts removal. Performing the ACTIVE TEST as the first step of troubleshooting is one method
to shorten labor time.
It is possible to display the DATA LIST during the ACTIVE TEST.
(a)

Warm up the engine.

(b)

Turn the ignition switch off.

(c)

Connect the hand–held tester to the DLC3.

(d)

Turn the ignition switch to the ON position.

(e)

Turn on the tester.

(f)

Select the item ”DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST”.

(g)

According to the display on the tester, perform the ”ACTIVE TEST”.

Item

Test Details

Diagnostic Note

LOCK UP

[Test Details]

Control the shift solenoid SLU to set the automatic transmission to the

lock–up condition.

[Vehicle Condition]

Throttle valve opening angle: Less than 35 %

Vehicle Speed: 60 km/h (37 mph) or more

Possible to check the SLU opera-

tion.

HINT:

This test can be conducted when the vehicle speed is 60 km/h (37 mph) or more.

This test can be conducted in the 5th gear.

Lightly depress the accelerator pedal and check that the engine speed does not change abruptly.

HINT:

When changing the accelerator pedal opening angle while driving, if the engine speed does not
change, lock–up is on.

Slowly release, but not fully, the accelerator pedal in order to decelerate. (Fully releasing the pedal will
close the throttle valve and lock–up may be turned off automatically.)

–

DIAGNOSTICS

AUTOMATIC TRANSMISSION

DI–677

871

1

Check other DTCs output (in addition to DTC P2757).

PREPARATION:
(a)

Turn the ignition switch off.

(b)

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

(c)

Turn the ignition switch to the ON position.

(d)

Turn on the tester.

(e)

Select the item ”DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES”.

CHECK:
Read the DTCs using the OBD II scan tool or the hand–held tester.
RESULT:

Display (DTC output)

Proceed to

Only ”P2757” is output

A

”P2757” and other DTCs

B

HINT:
If any other codes besides ”P2757” are output, perform troubleshooting for those DTCs first.

B

Go to DTC chart (See page 

DI–573

).

A

D12795

1

2

(–)

(+)

1

2

Shift Solenoid Valve SLU:

DI–678

–

DIAGNOSTICS

AUTOMATIC TRANSMISSION

872

2

Check shift solenoid valve SLU operation.

PREPARATION:
Remove the shift solenoid valve SLU (See page 

AT–10

).

CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:

Tester Connection

Specified Condition

20



C (68



F)

1 – 2

5.0 to 5.6 

Ω

CHECK:
Connect the positive (+) lead with a 21 W bulb to terminal 2 and
the negative (–) lead to terminal 1 of the solenoid valve connec-
tor, then check the movement of the valve.
OK:

The solenoid makes an operating sound.

NG

Replace the shift solenoid valve SLU
(See page 

AT–10

).

OK

3

Inspect valve body 

(See page 

AT–10

).

OK:

There are no foreign objects on each valve.

NG

Repair or replace valve body.

OK