Toyota Sequoia (2005). Manual - part 205

–

DIAGNOSTICS

AUTOMATIC TRANSMISSION

DI–615

809

TYPICAL ENABLING CONDITIONS

It

Specification

Item

Minimum

Maximum

All:

Turbine speed sensor circuit

Not circuit malfunction

Output speed sensor circuit

Not circuit malfunction

Shift solenoid valve S1 circuit

Not circuit malfunction

Shift solenoid valve S2 circuit

Not circuit malfunction

Shift solenoid valve SR circuit

Not circuit malfunction

Shift solenoid valve SL1 circuit

Not circuit malfunction

Shift solenoid valve SL2 circuit

Not circuit malfunction

ECT (Engine coolant temperature) sensor

circuit

Not circuit malfunction

KCS sensor circuit

Not circuit malfunction

ETCS (Electric throttle control system)

Not system down

Transmission range

”D”

ECT

40

°

C (104

°

F) or more

–

Spark advance from Max. retard timing by

KCS control

0

°

 

CA or more

–

Engine

Starting

Transfer range

”HIGH”

*1

Transfer range ”HIGH” *1 (This condition is applied only 4WD)

*1 Following conditions met

 Vehicle speed sensor circuit

Not circuit malfunction

 Output shaft speed sensor circuit

Not circuit malfunction

 Transfer output speed

143 rpm or more

–

 NO/NOtf (Transfer input speed/Transfer

output speed)

0.9 to 1.1

OFF malfunction (A)

ECM selected gear

1st

Vehicle speed

2 to 40 km/h (1.2 to 24.9 mph)

Throttle valve opening angle

7.0% or more at 2,000 rpm

(Conditions vary with engine speed)

–

OFF malfunction (B)

ECM selected gear

2nd

Vehicle speed

2 km/h (1.2 mph) or more

–

Output speed

2nd 

→

 1st down shift point or more

–

Throttle valve opening angle

7.0% or more at 2,000 rpm

(Conditions vary with engine speed)

–

OFF malfunction (C)

Current ECM selected gear

5th

Last ECM selected gear

4th

Continuous time for ECM selecting 4th

gear

2 sec. or more

–

Actual gear when ECM selected 4th gear

4th

OFF malfunction (D)

Current ECM selected gear

5th

DI–616

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DIAGNOSTICS

AUTOMATIC TRANSMISSION

810

Last ECM selected gear

4th

ON malfunction (A)

ECM selected gear

1st

Vehicle speed

2 to 40 km/h (1.2 to 24.9 mph)

Throttle valve opening angle

7.0% or more at 2,000 rpm

(Conditions vary with engine speed)

–

ON malfunction (B)

ECM selected gear

4th

Vehicle speed

2 km/h (1.2 mph) or more

–

Throttle valve opening angle

7.0% or more at 2,000 rpm

(Conditions vary with engine speed)

–

ON malfunction (C)

Current ECM selected gear

5th

Last ECM selected gear

4th

Vehicle speed 

(During transition from 4th to 5th gear)

–

Less than 100 km/h (62 mph)

ON malfunction (D)

ECM selected gear

5th

Engine speed – Turbine speed (NE – NT)

(After transition from 4th to 5th gear)

–

Less than 150 rpm

Vehicle speed 

(After transition from 4th to 5th gear)

–

Less than 100 km/h (62 mph)

TYPICAL MALFUNCTION THRESHOLDS

Detection criteria

Threshold

[OFF malfunction]

All of the following conditions are met: Conditions (A), (B), (C) and (D)

2 detections are necessary per driving cycle

 1st detection; temporary flag ON

 2nd detection; pending fault code ON

OFF malfunction (A) and (B)

Turbine speed/Output speed

3.30 to 7.50

OFF malfunction (C)

Turbine speed/Output speed

0.65 to 0.79

OFF malfunction (D)

Output record from ECM for 4th 

→

 5th upshifting

Recorded

[ON malfunction]

Both of the following conditions are met: ON malfunction (A) or (B), and ON malfunction (C) or (D)

ON malfunction (A)

Turbine speed/Output speed

1.91 to 2.35

ON malfunction (B)

Turbine speed/Output speed

1.28 to 1.53

ON malfunction (C)

Turbine speed – Output speed x 4th gear ratio 

(NT – NO x 4th gear ratio)

1,000 rpm or more

ECM command gearshift

Shift solenoid valve S2

1st

2nd

3rd

4th

5th

OFF

ON

ON

OFF

OFF

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DIAGNOSTICS

AUTOMATIC TRANSMISSION

DI–617

811

ON malfunction (E)

Turbine speed – Output speed x 5th gear ratio 

(NT – NO x 5th gear ratio)

1,000 rpm or more

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”.

HINT:
While driving, the shift position can be forcibly changed with the hand–held tester.
Comparing the shift position commanded by the ACTIVE TEST with the actual shift position enables you
to confirm the problem (See page 

DI–567

).

Item

Test Details

Diagnostic Note

SHIFT

[Test Details]

Operate the shift solenoid valve and set each shift position by yourself.

[Vehicle Condition]

Less than 50 km/h (31 mph)

[Others]

Press ”

→

” button: Shift up

Press ”

←

” button: Shift down

Possible to check the operation of

the shift solenoid valves.

HINT:

This test can be conducted when the vehicle speed is 50 km/h (31 mph) or less.

The 4th to 5th up–shiftings must be performed with the accelerator pedal released.

The 5th to 4th down–shiftings must be performed with the accelerator pedal released.

Do not operate the accelerator pedal for at least 2 seconds after shifting and do not shift successively.

The shift position commanded by the ECM is shown in the DATA LIST (SHIFT) display on the hand–
held tester.

The shift solenoid valve S2 is turned on/off normally when the shift lever is in the D position:

DI–618

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DIAGNOSTICS

AUTOMATIC TRANSMISSION

812

1

Check other DTCs output (in addition to DTC P0756).

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 ”P0756” is output

A

”P0756” and other DTCs

B

HINT:
If any other codes besides ”P0756” are output, perform troubleshooting for those DTCs first.

B

Go to DTC chart (See page 

DI–573

).

A